Cisco 350-801 Implementing Cisco Collaboration Core Technologies (CLCOR) Exam Dumps and Practice Test Questions Set 14 Q196-210
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Question196
An enterprise is implementing a multi-site Cisco SD-WAN deployment with dual Internet links at each branch. During peak usage, critical SaaS applications experience intermittent performance degradation. Path selection analysis shows that certain low-cost broadband links are saturated, while MPLS links remain underutilized. Which action MOST effectively addresses this issue?
A) Implement application-aware routing with SLA thresholds for SaaS traffic
B) Force all traffic over the MPLS links
C) Disable dynamic path selection to enforce static routes
D) Increase the bandwidth of low-cost broadband links without QoS changes
Answer: A
Explanation:
In a multi-site Cisco SD-WAN deployment, optimizing application performance across diverse WAN links is critical, particularly when links exhibit varying levels of congestion. The scenario indicates that low-cost broadband links are saturated during peak usage while MPLS links remain underutilized. This imbalance leads to intermittent performance issues for critical SaaS applications. Cisco SD-WAN provides application-aware routing, allowing real-time monitoring of path performance metrics such as latency, jitter, and packet loss. By defining SLA thresholds for important applications, the SD-WAN can dynamically steer traffic to links meeting the required performance criteria, ensuring that critical applications maintain acceptable quality even during congestion. Option A directly addresses the issue by leveraging the intelligence of SD-WAN to prioritize traffic based on application requirements and network conditions. This approach maximizes available resources and maintains consistent application performance without unnecessary manual intervention.
Option B, forcing all traffic over MPLS links, guarantees better performance due to the higher reliability of MPLS, but it underutilizes broadband links and may introduce cost inefficiencies. Additionally, forcing all traffic through MPLS can create bottlenecks during unexpected traffic spikes, and it eliminates the flexibility offered by SD-WAN to dynamically route traffic based on real-time conditions. This static approach reduces the overall efficiency of WAN utilization and fails to leverage broadband links that could otherwise accommodate non-critical traffic.
Option C, disabling dynamic path selection and enforcing static routes, removes the intelligence of SD-WAN. Static routing cannot adapt to real-time network performance, leading to persistent congestion on overutilized links and underutilization of available bandwidth on better-performing links. This rigidity reduces overall network performance and does not resolve intermittent degradation, especially during peak hours. Static routing may also complicate troubleshooting and hinder future scalability.
Option D, increasing the bandwidth of low-cost broadband links without implementing QoS or application-aware routing, may temporarily reduce congestion but does not prioritize critical traffic. Without SLA-based steering, all traffic competes equally for bandwidth, meaning critical SaaS applications can still experience performance degradation. Moreover, indiscriminate bandwidth expansion is a short-term solution that may not be cost-effective and does not address the need for intelligent traffic management.
Implementing application-aware routing with SLA thresholds ensures that critical applications are consistently routed over optimal paths while less critical traffic uses available bandwidth on secondary links. This strategy leverages the full capability of SD-WAN, ensuring high-quality SaaS performance, optimized link utilization, and reduced operational complexity. By aligning path selection with business priorities, network administrators can maintain predictable application performance, improve end-user experience, and maximize the value of existing WAN infrastructure.
Question197
A large organization deploys Cisco Webex Edge for Devices to support remote employees. Users report that some meetings fail to connect or experience poor video quality, particularly when behind corporate firewalls and NAT devices. Troubleshooting shows that ICE candidates are not exchanged properly, and some UDP media ports are blocked. Which action MOST effectively resolves the issue?
A) Open the required UDP ports for TURN/STUN traffic on corporate firewalls
B) Force all traffic through a VPN tunnel for remote employees
C) Disable ICE functionality on Webex Edge devices
D) Increase TCP timeout values for signaling between devices and the cloud
Answer: A
Explanation:
Cisco Webex Edge for Devices relies on ICE, STUN, and TURN protocols to facilitate NAT traversal and establish media paths between endpoints. The problem described—meeting failures and poor video quality behind corporate firewalls and NAT—indicates that the media negotiation process is being blocked or disrupted. ICE candidates must be exchanged successfully to determine the optimal media path, and UDP ports used by TURN/STUN must remain open to allow connectivity. Option A, opening the required UDP ports for TURN/STUN traffic on corporate firewalls, directly addresses the underlying problem. This ensures that ICE candidates can be exchanged without obstruction, allowing remote endpoints to negotiate media paths effectively and maintain high-quality audio and video sessions. Proper port configuration is essential for scalability, reliability, and predictable performance in large enterprise deployments.
Option B, forcing all traffic through a VPN tunnel, adds latency and complexity, and may not resolve blocked UDP port issues if the VPN configuration does not allow the necessary media traffic. While VPNs can provide secure connectivity, they are not optimized for real-time media and can increase jitter, delay, and packet loss, exacerbating the problem instead of resolving it.
Option C, disabling ICE functionality, would break NAT traversal entirely. ICE is fundamental to establishing the best media path between endpoints, especially in environments with complex NAT and firewall configurations. Disabling ICE would lead to failed calls and poor-quality media streams, making it an unsuitable solution.
Option D, increasing TCP timeout values for signaling, affects session persistence but does not address the blocked UDP ports or ICE negotiation failures. Signaling timeouts alone cannot restore proper media path establishment, and the underlying connectivity issues would persist.
Opening the required UDP ports for TURN/STUN traffic ensures that remote employees can reliably connect to meetings, establish media paths, and maintain optimal audio and video quality. This approach aligns with Cisco best practices, supports large-scale deployments, and addresses the root cause of ICE candidate exchange failures, providing a robust, long-term solution. Proper port configuration also reduces troubleshooting complexity and enables predictable, high-quality collaboration experiences.
Question198
A company deploys Cisco Unified Communications Manager (CUCM) across multiple clusters. Some inter-cluster calls experience one-way audio and occasional call drops. SIP traces show that endpoints send early media before the SIP trunk has rewritten the SDP. Which configuration MOST effectively resolves this issue?
A) Enable delayed-offer SDP on CUCM SIP trunks
B) Convert all SIP endpoints to SCCP
C) Use SIP over TCP instead of UDP
D) Disable early media globally on CUCM
Answer: A
Explanation:
One-way audio and call drops in multi-cluster CUCM environments often stem from timing mismatches in SDP negotiation. SDP carries media parameters, including codec selection, IP addresses, and port numbers. When endpoints send early media before the SIP trunk has rewritten SDP, RTP packets may arrive at endpoints before the media path is properly anchored, causing audio issues. Option A, enabling delayed-offer SDP on CUCM SIP trunks, addresses this by ensuring that SDP is only offered after the 200 OK response, allowing proper rewriting and alignment of media parameters. This guarantees that RTP streams are correctly anchored, preventing one-way audio and call drops. Delayed-offer SDP is a recommended practice for multi-cluster deployments, ensuring consistency and reliability across clusters. It also simplifies troubleshooting, reduces configuration errors, and aligns media negotiation with enterprise voice design standards.
Option B, converting SIP endpoints to SCCP, changes the signaling protocol but does not address SDP timing issues. Audio problems may persist, and interoperability with other SIP clusters may remain problematic.
Option C, using SIP over TCP, ensures reliable delivery of signaling messages but does not resolve SDP or early media timing issues. While TCP guarantees message delivery, it does not control when media is transmitted relative to SDP exchange, and early media may still be sent prematurely.
Option D, disabling early media globally, affects the handling of call progress tones but does not solve SDP synchronization or media anchoring problems. Early media control alone is insufficient to prevent one-way audio or dropped calls caused by SDP mismatches.
Enabling delayed-offer SDP aligns media negotiation timing, ensures correct RTP anchoring, prevents one-way audio, reduces dropped calls, and simplifies multi-cluster voice management. It is the most effective configuration for maintaining consistent audio quality and reliable inter-cluster communication in enterprise environments. Proper SDP handling also ensures codec negotiation consistency and reduces troubleshooting complexity across clusters.
Question199
During a Cisco SD-WAN deployment, the network team notices that specific applications intermittently fail to meet required SLAs. Path metrics indicate that some overlay tunnels experience congestion while others remain underutilized. Which action MOST effectively improves application performance?
A) Implement SLA-based application-aware routing for critical traffic
B) Force all traffic over the highest-bandwidth tunnel
C) Disable dynamic path selection and rely on static routing
D) Increase the MTU of all overlay tunnels
Answer: A
Explanation:
Cisco SD-WAN provides intelligent path selection, application-aware routing, and SLA-based traffic steering to optimize WAN performance. In scenarios where overlay tunnels show congestion while others are underutilized, application-aware routing allows the network to dynamically steer traffic based on real-time performance metrics, such as latency, jitter, and packet loss. Option A, implementing SLA-based application-aware routing for critical traffic, ensures that essential applications are consistently routed over optimal paths, while non-critical traffic can utilize secondary links. This approach reduces packet loss, maintains low latency, and improves end-user experience for high-priority applications.
Option B, forcing all traffic over the highest-bandwidth tunnel, does not account for real-time network conditions. Congestion can still occur if multiple applications simultaneously use the same tunnel, and dynamic traffic management benefits of SD-WAN are lost.
Option C, disabling dynamic path selection and using static routing, eliminates SD-WAN’s intelligence. Static routes cannot adapt to congestion or network changes, leading to persistent SLA violations and reduced application performance.
Option D, increasing tunnel MTU, addresses fragmentation but does not solve congestion or latency issues. MTU adjustments do not optimize path selection or prioritize critical traffic, so performance problems remain for latency-sensitive applications like VoIP or video conferencing.
SLA-based application-aware routing leverages SD-WAN intelligence to dynamically adapt to changing network conditions, prioritize critical traffic, and optimize link utilization. This ensures consistent application performance, reduces operational complexity, and enhances the overall reliability of the WAN infrastructure. It aligns traffic management with business priorities and maximizes the effectiveness of existing WAN resources.
Question200
Remote Cisco Jabber clients experience intermittent registration failures and poor call quality when behind NAT devices. Analysis shows that ICE candidate exchange fails intermittently, and RTP traffic is blocked by the firewall. Which configuration MOST effectively resolves this issue?
A) Increase Expressway traversal zone resources and enable full bidirectional ICE support
B) Require all remote users to connect via VPN
C) Reduce CUCM SIP registration timers to force retries
D) Enable persistent XMPP connections between Expressway-C and CUCM
Answer: A
Explanation:
Jabber clients behind NAT rely on Expressway traversal zones to facilitate registration, signaling, and RTP media connectivity. Intermittent ICE failures and blocked RTP indicate resource constraints or insufficient ICE handling in the traversal zones. Option A, increasing Expressway traversal zone resources and enabling full bidirectional ICE support, directly addresses these root causes. Enhanced resources allow traversal zones to handle high volumes of simultaneous registrations and calls, while bidirectional ICE ensures proper candidate exchange and optimal media path negotiation. This solution maintains high-quality voice and video calls, reduces registration failures, and supports scalable remote deployments.
Option B, requiring VPN connectivity, adds latency, complexity, and does not address resource limitations or ICE negotiation issues. VPNs can create additional bottlenecks and do not optimize media paths.
Option C, reducing CUCM SIP registration timers, increases retry frequency but does not resolve ICE failures or RTP path establishment. This approach can increase signaling load and further stress traversal resources.
Option D, enabling persistent XMPP connections, improves messaging reliability but does not affect ICE or RTP media connectivity. While chat and presence may benefit, voice and video issues remain unresolved.
Increasing Expressway traversal zone resources and enabling bidirectional ICE ensures reliable Jabber registration, proper RTP path establishment, and consistent call quality. It supports large-scale remote deployments, reduces operational issues, and aligns with Cisco best practices for enterprise collaboration. This configuration ensures predictable, high-quality audio and video communication for users behind NAT, maximizing end-user experience and operational efficiency.
Question201
A multinational organization is deploying a Cisco SD-WAN architecture across five continents. After deployment, network engineers notice that critical ERP application traffic frequently experiences high jitter and packet loss between regional hubs, while general traffic remains unaffected. Which configuration MOST effectively addresses this issue?
A) Implement application-aware routing with SLA thresholds for ERP traffic
B) Force all traffic over high-capacity backbone MPLS circuits
C) Disable dynamic path selection and configure static routing for ERP traffic
D) Increase the MTU size on all overlay tunnels to reduce fragmentation
Answer: A
Explanation:
In a global Cisco SD-WAN deployment, traffic for latency-sensitive applications such as ERP systems must be carefully managed to ensure consistent performance. The scenario indicates that critical ERP traffic experiences jitter and packet loss, while general traffic does not, highlighting the need for intelligent traffic steering and prioritization. Cisco SD-WAN provides the capability to implement application-aware routing with SLA thresholds, allowing the system to monitor metrics such as latency, jitter, packet loss, and bandwidth utilization in real-time. By establishing SLA thresholds for ERP traffic, the SD-WAN controllers can dynamically steer this critical traffic through paths that meet the required performance criteria while allowing non-critical traffic to use alternate paths. This approach ensures that ERP traffic receives optimal treatment, minimizing disruption and maintaining predictable application performance.
Option B, forcing all traffic over high-capacity MPLS circuits, provides a reliable path but fails to take advantage of SD-WAN intelligence and dynamic path selection. While MPLS can provide consistent bandwidth, this approach is not scalable and may underutilize other available WAN links. Furthermore, forcing all traffic over MPLS ignores the potential cost efficiency of using broadband links for non-critical traffic. This method also does not adapt to real-time fluctuations in path quality, potentially leaving ERP traffic subject to congestion during peak periods.
Option C, disabling dynamic path selection and configuring static routes for ERP traffic, eliminates the ability to adapt to real-time network conditions. Static routing does not respond to congestion, packet loss, or latency spikes, which can exacerbate jitter and performance issues for latency-sensitive applications. Static routes increase operational complexity as administrators must manually monitor and adjust paths to maintain SLA compliance. This approach is not feasible in a global deployment with fluctuating network conditions and multiple WAN links across continents.
Option D, increasing the MTU size on overlay tunnels, addresses fragmentation but does not resolve jitter or packet loss caused by path congestion or suboptimal routing. While larger MTU may reduce segmentation overhead, it cannot compensate for dynamic WAN conditions affecting real-time ERP traffic. MTU tuning alone does not provide SLA-based prioritization or intelligent traffic steering, leaving critical traffic vulnerable to latency spikes and intermittent packet loss.
Implementing application-aware routing with SLA thresholds ensures that ERP traffic is consistently directed over paths meeting strict performance criteria. This approach leverages SD-WAN intelligence, dynamically adjusting routing decisions based on real-time metrics and business priorities. It optimizes resource utilization, reduces jitter, and minimizes packet loss for critical applications, providing a predictable user experience. Additionally, it simplifies operations by automating path selection and minimizing the need for manual intervention, which is crucial in a complex multinational deployment. Application-aware routing also allows network teams to prioritize multiple critical applications simultaneously, balancing performance needs and cost considerations while ensuring compliance with organizational SLAs.
Question202
An organization is experiencing intermittent one-way audio on Cisco Unified Communications Manager (CUCM) calls between remote sites. SIP traces indicate that early media is being sent before the remote SIP trunk has properly rewritten the SDP. Which configuration change MOST effectively resolves this issue?
A) Enable delayed-offer SDP on CUCM SIP trunks
B) Convert all endpoints to SCCP to simplify signaling
C) Force SIP signaling over TCP instead of UDP
D) Disable early media globally on CUCM
Answer: A
Explanation:
One-way audio problems in CUCM environments often stem from timing issues in the SDP negotiation process. SDP carries media parameters including codec, IP address, and port information. In multi-cluster deployments or environments with SIP trunks, endpoints may transmit early media before SDP has been rewritten, causing RTP packets to arrive at the wrong destination or before proper media path setup. Enabling delayed-offer SDP on CUCM SIP trunks ensures that SDP is only offered after receiving the 200 OK response, aligning the media path correctly and preventing one-way audio. Delayed-offer SDP is a recommended best practice for SIP trunk interconnections and multi-cluster CUCM deployments because it allows CUCM to anchor media correctly, rewrite addresses, and ensure that audio flows as expected.
Option B, converting endpoints to SCCP, changes the signaling protocol but does not address the root cause of SDP timing mismatches. While SCCP may simplify certain call control operations, audio issues related to SDP timing and early media are not resolved by switching protocols. Additionally, converting endpoints can introduce interoperability issues and increase administrative overhead without guaranteeing resolution of one-way audio.
Option C, forcing SIP signaling over TCP, provides reliable transport for signaling messages but does not solve timing discrepancies in SDP offer/answer negotiation. TCP ensures that SIP messages are delivered but does not prevent endpoints from sending early media before SDP rewriting occurs. Hence, audio issues may persist despite reliable signaling transport.
Option D, disabling early media globally, prevents endpoints from sending media before call establishment, but this approach may break legitimate call progress tones or ringback signals and does not inherently solve SDP rewriting issues. While it could mitigate some symptoms, it does not address the underlying timing problem between SDP offer and answer, leaving the deployment susceptible to similar issues in different call flows.
Enabling delayed-offer SDP ensures proper media anchoring, prevents one-way audio, reduces dropped calls, and aligns with best practices for multi-cluster CUCM SIP trunk configurations. It guarantees that RTP streams are properly established and endpoints negotiate media effectively, maintaining audio quality and reliability across remote sites. By implementing delayed-offer SDP, organizations can ensure consistent voice quality, simplify troubleshooting, and maintain interoperability in complex SIP trunking environments, which is critical for enterprise communications.
Question203
During a Cisco Webex Edge for Devices deployment, users behind corporate firewalls report failed meetings and poor video quality. ICE candidate exchange fails intermittently, and UDP media ports are blocked. Which action MOST effectively resolves the issue?
A) Open required UDP ports for TURN/STUN traffic on corporate firewalls
B) Force all users through a VPN connection
C) Disable ICE functionality on Webex Edge devices
D) Increase TCP timeout values for signaling
Answer: A
Explanation:
Cisco Webex Edge for Devices relies on ICE, STUN, and TURN protocols to traverse NAT and firewall environments and establish reliable media paths. Failed meetings and poor video quality indicate that ICE candidate exchange is being blocked, and UDP media cannot flow properly. Opening the required UDP ports for TURN/STUN traffic allows ICE candidates to be exchanged correctly, enabling endpoints to negotiate optimal media paths. This action ensures that both signaling and media can traverse firewalls efficiently, preserving meeting quality and reducing failures. Proper port configuration also ensures scalability for large enterprise deployments.
Option B, forcing users through a VPN, adds overhead and latency, and may not resolve UDP blocking issues if the VPN configuration does not support required media ports. VPNs can degrade real-time media quality and increase jitter, failing to guarantee consistent video and audio performance.
Option C, disabling ICE, breaks NAT traversal entirely and prevents endpoints from establishing media paths across firewalls and NAT. This results in more failed connections and poor media performance.
Option D, increasing TCP timeout values, affects signaling but does not solve blocked UDP ports or ICE failures. The underlying connectivity issue remains unresolved, leaving media quality unreliable.
Opening the required UDP ports ensures reliable ICE candidate exchange, proper media negotiation, and consistent audio/video quality. This solution aligns with Cisco best practices, supports large-scale remote deployments, and addresses the root cause of connectivity issues, providing a robust and scalable approach for enterprise collaboration.
Question204
A company experiences intermittent SLA violations for video conferencing traffic across SD-WAN overlay tunnels. Some tunnels are congested, while others remain underutilized. Which configuration MOST effectively addresses this performance issue?
A) Implement SLA-based application-aware routing for video conferencing traffic
B) Force all traffic over the highest-bandwidth tunnel
C) Disable dynamic path selection and use static routes
D) Increase MTU size of all overlay tunnels
Answer: A
Explanation:
SLA violations for video traffic in SD-WAN deployments often result from uneven utilization of overlay tunnels and lack of traffic prioritization. Application-aware routing allows SD-WAN to dynamically monitor performance metrics such as latency, jitter, packet loss, and throughput, steering traffic according to SLA thresholds. Implementing SLA-based routing ensures that video conferencing traffic is directed over optimal tunnels, maintaining quality while non-critical traffic utilizes other paths.
Option B, forcing all traffic over a single high-bandwidth tunnel, does not account for real-time performance, potentially creating congestion and failing to adapt to changing network conditions.
Option C, disabling dynamic path selection, removes SD-WAN intelligence, making it unable to respond to congestion or performance fluctuations.
Option D, increasing MTU, addresses fragmentation but does not resolve congestion, latency, or packet loss, leaving SLA violations unaddressed.
SLA-based application-aware routing dynamically optimizes tunnel usage, prioritizes critical video traffic, and ensures predictable performance. This approach maximizes resource efficiency, reduces congestion on high-priority paths, and improves end-user experience for real-time applications. It aligns network behavior with business priorities and ensures consistent SLA compliance across the SD-WAN deployment.
Question205
Remote Cisco Jabber clients experience registration failures and poor call quality when behind NAT. ICE candidate exchange fails intermittently, and RTP traffic is blocked. Which action MOST effectively resolves the issue?
A) Increase Expressway traversal zone resources and enable full bidirectional ICE support
B) Require all users to connect via VPN
C) Reduce CUCM SIP registration timers to force retries
D) Enable persistent XMPP connections between Expressway-C and CUCM
Answer: A
Explanation:
Jabber clients behind NAT rely on Expressway traversal zones for signaling, registration, and media connectivity. Registration failures and poor call quality often result from resource constraints or insufficient ICE handling in the traversal zones. Increasing traversal zone resources ensures sufficient capacity for concurrent registrations and call sessions, while enabling full bidirectional ICE allows proper candidate exchange and media path negotiation. This configuration ensures reliable Jabber registration, consistent RTP connectivity, and high-quality voice/video performance.
Option B, requiring VPN connectivity, introduces latency and does not address traversal zone resource constraints or ICE failures.
Option C, reducing CUCM SIP registration timers, increases retries but does not solve ICE negotiation or RTP path issues.
Option D, enabling persistent XMPP connections, improves messaging reliability but does not impact ICE or RTP connectivity, leaving call quality issues unresolved.
Increasing traversal zone resources and enabling bidirectional ICE ensures scalable, reliable Jabber deployments behind NAT, supports high-quality media sessions, and aligns with Cisco best practices for enterprise collaboration, providing predictable registration and call performance for remote users.
Question206
A large enterprise is deploying a Cisco SD-WAN environment with multiple transport links, including MPLS, broadband, and LTE. Users report inconsistent performance for cloud-based CRM applications during peak hours, despite sufficient bandwidth. Which configuration MOST effectively resolves this issue?
A) Configure SLA-based application-aware routing with performance thresholds for CRM traffic
B) Force all cloud traffic over MPLS links to ensure consistency
C) Disable path selection and configure static routes for cloud applications
D) Increase MTU size on all overlay tunnels to reduce fragmentation
Answer: A
Explanation:
In a multi-transport Cisco SD-WAN deployment, the performance of cloud-based applications can fluctuate due to varying path conditions, congestion, and dynamic WAN metrics. The scenario highlights that cloud CRM applications experience inconsistent performance during peak hours, suggesting the issue is related to path selection, latency, jitter, or packet loss, rather than raw bandwidth availability. Cisco SD-WAN supports SLA-based application-aware routing, which allows network administrators to define performance thresholds for critical applications. These thresholds monitor metrics such as latency, jitter, packet loss, and bandwidth availability. When a path fails to meet SLA criteria, the SD-WAN orchestrator dynamically steers traffic through alternate paths that meet the desired performance. Implementing SLA-based routing for CRM traffic ensures that business-critical applications receive optimal treatment across the available transport links, reducing latency, jitter, and packet loss while maintaining predictable user experience.
Option B, forcing all cloud traffic over MPLS links, prioritizes a high-quality path but is inefficient and costly. MPLS may not fully utilize available broadband or LTE links, reducing overall WAN efficiency. Additionally, during congestion periods on the MPLS network, performance may still degrade. Unlike SLA-based routing, static MPLS prioritization does not adapt to real-time network conditions, leaving cloud applications vulnerable to temporary spikes in latency or packet loss.
Option C, disabling path selection and configuring static routes for cloud applications, removes the dynamic intelligence of SD-WAN. Static routes cannot respond to changing network conditions, congestion, or link failures, and any performance degradation will directly affect application quality. This approach increases operational complexity, as administrators must manually adjust routes to maintain acceptable performance, which is impractical for multi-transport global deployments.
Option D, increasing MTU size on overlay tunnels, primarily addresses packet fragmentation and does not influence latency, jitter, or path congestion. While a larger MTU may reduce packet overhead in certain scenarios, it does not provide application-aware traffic steering or dynamic adaptation to real-time WAN conditions. Therefore, MTU tuning alone cannot resolve inconsistent CRM application performance across multiple transport links.
By implementing SLA-based application-aware routing, the SD-WAN environment can dynamically assess each path in real time and steer traffic accordingly. This ensures cloud CRM applications consistently meet performance thresholds and reduces the risk of performance degradation during peak periods. SLA-based routing also allows prioritization of multiple applications simultaneously, balancing business needs, network efficiency, and cost-effectiveness. This approach leverages SD-WAN intelligence, optimizes transport utilization, and guarantees predictable user experience for critical business applications while simplifying operational management across complex multi-link WAN environments.
Question207
A multinational company is deploying Cisco Webex Edge for Devices in multiple regions. Users behind corporate firewalls experience intermittent video freezes, call drops, and failed meeting connections. ICE candidates are not being exchanged properly, and UDP media is being blocked. Which action MOST effectively resolves this issue?
A) Open all required UDP ports for TURN/STUN traffic on corporate firewalls
B) Force all users to connect via VPN to bypass the firewall
C) Disable ICE functionality on Webex Edge devices
D) Increase TCP timeout values for signaling traffic
Answer: A
Explanation:
Cisco Webex Edge for Devices relies on ICE, STUN, and TURN protocols to negotiate NAT traversal and establish direct media paths between endpoints. Video freezes, call drops, and failed meetings typically occur when ICE candidate exchange is blocked by firewalls, preventing endpoints from discovering optimal media paths. Opening all required UDP ports for TURN/STUN traffic ensures that ICE candidates can traverse firewalls, allowing devices to establish reliable signaling and media channels. This configuration aligns with Cisco best practices for Webex Edge deployments in enterprise environments where NAT and firewalls are present. It enables proper media path negotiation, reduces packet loss, and enhances audio/video performance.
Option B, forcing users to connect via VPN, can bypass firewall restrictions but introduces latency, reduces network efficiency, and may not solve all media path issues. VPNs can create congestion points and degrade real-time media performance, particularly for video traffic, which requires low latency and minimal jitter for optimal quality. This approach is also operationally more complex and less scalable compared to proper firewall configuration.
Option C, disabling ICE functionality, completely removes the ability of devices to discover the best media paths, making NAT traversal impossible. Without ICE, endpoints may attempt direct connections that fail behind NAT or firewall restrictions, leading to increased call drops, freezes, and poor user experience. Disabling ICE is not recommended in modern Webex Edge deployments.
Option D, increasing TCP timeout values for signaling, affects SIP or XMPP signaling but does not solve UDP media blocking or ICE negotiation failures. Adjusting TCP parameters may prevent signaling timeouts, but real-time media quality remains compromised if ICE candidates cannot traverse the firewall.
Opening all required UDP ports allows Webex Edge devices to exchange ICE candidates, enabling endpoints to negotiate the most efficient media paths and maintain consistent audio/video quality. This approach is scalable, supports multiple regional deployments, and ensures predictable performance for enterprise collaboration. It addresses the root cause of connectivity issues rather than applying temporary workarounds and provides a robust solution aligned with Cisco recommendations for NAT and firewall traversal in global deployments.
Question208
A company with a Cisco SD-WAN environment observes that video conferencing traffic intermittently experiences high jitter and packet loss across overlay tunnels. Some tunnels are congested, while others remain underutilized. Which configuration MOST effectively resolves this issue?
A) Implement SLA-based application-aware routing for video traffic
B) Force all video traffic over the highest-bandwidth tunnel
C) Disable dynamic path selection and use static routes
D) Increase MTU size on all overlay tunnels
Answer: A
Explanation:
High jitter and packet loss on video conferencing traffic in SD-WAN networks are commonly caused by uneven tunnel utilization, congestion, and lack of prioritization. Video applications are highly sensitive to latency, jitter, and packet loss, requiring careful traffic engineering to maintain quality. SLA-based application-aware routing allows SD-WAN controllers to monitor performance metrics such as latency, jitter, and packet loss in real time. Traffic is dynamically steered over tunnels that meet predefined SLA thresholds for video applications, ensuring optimal delivery.
Option B, forcing all video traffic over the highest-bandwidth tunnel, does not address congestion or performance degradation caused by variable network conditions. A single tunnel may become saturated during peak hours, causing jitter and packet loss. Additionally, this approach fails to utilize underutilized tunnels, resulting in inefficient bandwidth usage.
Option C, disabling dynamic path selection and using static routes, eliminates SD-WAN intelligence. Static routing does not adapt to congestion, packet loss, or variable latency, leaving video traffic vulnerable to performance degradation and SLA violations. This approach also increases operational complexity, requiring manual adjustments to maintain acceptable quality.
Option D, increasing MTU size, primarily addresses packet fragmentation but does not influence congestion, jitter, or latency. While MTU tuning may slightly improve throughput for large packets, it does not resolve the core issue of dynamic path selection and performance optimization for real-time video traffic.
By implementing SLA-based application-aware routing, SD-WAN can dynamically balance traffic across multiple tunnels, prioritize latency-sensitive video applications, and maintain predictable quality. This approach maximizes network efficiency, ensures compliance with performance thresholds, and provides a consistent user experience. SLA-based routing allows the network to respond to real-time conditions, optimize overlay tunnels, and prevent congestion-related degradation, aligning network behavior with business priorities and maintaining high-quality video communication in enterprise environments.
Question209
Remote Cisco Jabber clients report registration failures and poor call quality when connecting from behind NAT devices. ICE candidate exchange fails intermittently, and RTP traffic is blocked. Which configuration MOST effectively resolves the issue?
A) Increase Expressway traversal zone resources and enable bidirectional ICE support
B) Require all Jabber users to connect via VPN
C) Reduce CUCM SIP registration timers to force retries
D) Enable persistent XMPP connections between Expressway-C and CUCM
Answer: A
Explanation:
Jabber clients behind NAT rely on Expressway traversal zones to handle signaling, registration, and media connectivity. Registration failures and poor call quality typically arise when traversal zones lack sufficient resources or when ICE negotiation fails. Increasing traversal zone resources ensures that sufficient capacity exists for concurrent registrations and media sessions. Enabling bidirectional ICE allows Jabber clients to discover valid media paths through NAT and firewall devices, ensuring proper RTP flow and high-quality voice/video performance.
Option B, forcing VPN connectivity, introduces latency, potential congestion, and operational complexity. While it may bypass NAT/firewall issues, it does not address traversal zone resource limitations or ICE negotiation failures. VPNs also increase administrative overhead and reduce scalability for large remote deployments.
Option C, reducing CUCM SIP registration timers, increases retry frequency but does not solve ICE or RTP path issues. Registration retries alone cannot guarantee proper media path discovery or call quality behind NAT devices.
Option D, enabling persistent XMPP connections, improves messaging reliability but does not affect ICE or RTP media negotiation. Call quality issues related to NAT traversal remain unresolved if ICE candidates cannot be exchanged effectively.
By increasing Expressway traversal zone resources and enabling bidirectional ICE support, Jabber clients behind NAT can reliably register, establish media paths, and maintain high-quality calls. This approach ensures scalability, predictable performance, and alignment with Cisco best practices for enterprise collaboration deployments. It addresses the root cause of registration and call quality problems rather than applying temporary workarounds, providing a robust solution for remote users in complex network environments.
Question210
An enterprise with a Cisco SD-WAN deployment observes that critical ERP application traffic is experiencing intermittent latency spikes and packet loss, while general web traffic remains unaffected. Which configuration MOST effectively resolves this issue?
A) Implement SLA-based application-aware routing for ERP traffic
B) Force all traffic over a dedicated MPLS link
C) Configure static routing for ERP traffic and disable dynamic path selection
D) Increase the MTU of all overlay tunnels to minimize fragmentation
Answer: A
Explanation:
In SD-WAN environments, latency-sensitive applications such as ERP require careful traffic engineering to ensure predictable performance. The scenario indicates intermittent latency and packet loss for ERP traffic, while other traffic is unaffected, suggesting that path selection and congestion are impacting critical applications. SLA-based application-aware routing allows the SD-WAN controllers to monitor real-time metrics such as latency, jitter, and packet loss, steering ERP traffic through paths that meet defined performance thresholds. This ensures predictable performance for ERP applications while maintaining efficient use of all available transport links.
Option B, forcing all traffic over a dedicated MPLS link, ensures path reliability but is inefficient and costly. It does not dynamically adapt to changing network conditions and may not fully utilize available broadband or LTE links. This approach also fails to respond to temporary congestion or latency spikes on the MPLS path.
Option C, configuring static routing and disabling dynamic path selection, removes SD-WAN intelligence. Static routes cannot respond to congestion or path degradation, leaving ERP applications vulnerable to latency and packet loss. This method increases operational complexity, as manual adjustments are required to maintain performance.
Option D, increasing MTU size, addresses packet fragmentation but does not affect congestion, latency, or jitter. Larger MTU does not optimize path selection or dynamically route latency-sensitive traffic.
Implementing SLA-based application-aware routing ensures ERP traffic is directed over optimal paths, dynamically adapting to network conditions, minimizing latency, and reducing packet loss. This approach aligns with business priorities, ensures predictable application performance, and leverages SD-WAN intelligence to optimize resource utilization. SLA-based routing maximizes WAN efficiency, maintains application performance, and provides operational simplicity by automating path selection for critical business applications across complex network topologies.
In modern SD-WAN environments, traffic management for latency-sensitive and mission-critical applications such as ERP (Enterprise Resource Planning) is a key consideration. ERP applications are highly dependent on consistent network performance; intermittent latency, jitter, or packet loss can directly impact business operations, including financial transactions, supply chain processing, and internal reporting. The scenario described, where ERP traffic experiences latency and packet loss while other traffic is unaffected, indicates that network congestion, path degradation, or suboptimal path selection is affecting critical application flows. Ensuring predictable performance requires an intelligent approach to traffic engineering that leverages the capabilities of the SD-WAN architecture rather than relying solely on static configurations.
Option A, implementing SLA-based application-aware routing for ERP traffic, directly addresses this issue. SLA-based routing allows the SD-WAN controller to continuously monitor network metrics such as latency, jitter, packet loss, and bandwidth utilization across multiple available transport links. The controller can then dynamically steer ERP traffic over paths that meet predefined performance thresholds. For example, if an MPLS link experiences temporary congestion or latency spikes, the SD-WAN fabric can reroute ERP traffic over a broadband or LTE link that satisfies the SLA requirements. This ensures predictable application performance, reduces the likelihood of packet loss, and maintains low latency for time-sensitive operations. Application-aware routing also allows traffic classification, so critical business applications like ERP are prioritized over less sensitive traffic, ensuring that business continuity and productivity are maintained. By leveraging SD-WAN intelligence, SLA-based routing provides automated, adaptive path selection, significantly simplifying network management and reducing operational overhead.
Option B, forcing all traffic over a dedicated MPLS link, provides a guaranteed path for ERP traffic but is inefficient and costly. Dedicated MPLS circuits are expensive, and routing all traffic over a single link does not take advantage of alternative transport paths such as broadband or LTE, which may offer sufficient performance at a lower cost. Additionally, a static path does not respond to transient network issues such as congestion, packet loss, or sudden latency increases on the MPLS link. If the MPLS path becomes temporarily degraded, ERP traffic would still experience performance problems because the path is statically defined, undermining the reliability that SLA-based routing provides. This approach also limits the flexibility and scalability of the network, preventing the organization from fully leveraging the benefits of a multi-transport SD-WAN architecture.
Option C, configuring static routing for ERP traffic and disabling dynamic path selection, removes the inherent intelligence of SD-WAN. Static routes are fixed and cannot adapt to changes in network conditions, such as congestion, link failure, or increased latency. ERP traffic routed over a static path may experience degraded performance when the chosen path is suboptimal, leading to packet loss, higher latency, or jitter. Additionally, maintaining static routes for multiple applications and branch locations increases operational complexity, as network administrators must manually monitor link conditions and adjust routing policies in real time. This approach is not scalable in large or dynamic networks and fails to deliver the automation and resilience that SD-WAN is designed to provide.
Option D, increasing the MTU (Maximum Transmission Unit) of overlay tunnels to minimize fragmentation, addresses a completely different aspect of network performance. Larger MTU values reduce the likelihood of IP packet fragmentation, which can improve throughput for some applications and reduce processing overhead. However, increasing MTU does not resolve latency, jitter, packet loss, or suboptimal path selection, which are the primary issues affecting ERP traffic in this scenario. While MTU optimization is useful for improving efficiency in certain scenarios, it does not guarantee predictable application performance or address congestion and transport path variability, making it an inadequate solution for latency-sensitive ERP traffic.