Cisco 350-801 Implementing Cisco Collaboration Core Technologies (CLCOR) Exam Dumps and Practice Test Questions Set 15 Q211-225

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Question211

A global enterprise with multiple branch offices is deploying Cisco SD-WAN to improve application performance and reliability. Users report slow performance for SaaS applications hosted in the cloud during peak traffic hours, despite the WAN links showing sufficient bandwidth. Which solution MOST effectively resolves this issue?

A) Implement SLA-based application-aware routing with thresholds specific to SaaS applications
B) Route all cloud traffic over the MPLS links to guarantee reliability
C) Disable dynamic path selection and configure static routes for cloud applications
D) Increase the MTU size of overlay tunnels to reduce fragmentation

Answer: A

Explanation:

In a multi-transport SD-WAN environment, inconsistent performance for cloud-hosted SaaS applications often stems from dynamic WAN conditions such as latency, jitter, and transient congestion rather than bandwidth limitations alone. SLA-based application-aware routing is the most effective solution because it allows the network to evaluate multiple WAN paths against predefined performance thresholds for each application type. By doing so, traffic can be dynamically routed over paths that meet the necessary latency, jitter, and packet loss criteria for SaaS applications, ensuring that user experience remains consistent even during periods of high network utilization.

Option B, routing all cloud traffic over MPLS links, attempts to enforce reliability by using traditionally high-quality connections. However, this approach does not utilize the SD-WAN capabilities of dynamic path selection, and it may lead to underutilization of broadband or LTE links. Additionally, MPLS links themselves can experience congestion or latency spikes, and routing all traffic through a single type of transport is cost-inefficient and lacks adaptability to real-time network conditions.

Option C, disabling dynamic path selection and configuring static routes, removes the intelligence inherent in SD-WAN. Static routes cannot adapt to fluctuations in latency, jitter, or packet loss and therefore cannot guarantee the consistent performance required by latency-sensitive SaaS applications. Manual intervention would be required to adjust routes, increasing operational overhead and delaying response to performance degradation.

Option D, increasing the MTU size of overlay tunnels, addresses packet fragmentation issues but does not mitigate latency or congestion-related problems. While adjusting MTU can enhance efficiency for certain large-packet applications, it has minimal impact on the performance of cloud SaaS applications, which are more sensitive to real-time transport quality metrics than packet size.

By implementing SLA-based application-aware routing, enterprises gain the ability to dynamically steer critical SaaS traffic through optimal paths, balancing performance, cost, and reliability. This approach leverages SD-WAN intelligence to monitor WAN conditions continuously, adjust routing decisions in real time, and provide predictable application performance for end users. The solution addresses the root causes of poor performance, rather than applying static or reactive measures, and ensures that cloud applications function optimally even during peak network utilization, maintaining productivity and user satisfaction.

Question212

A company deploying Cisco Webex Edge for Devices observes intermittent call drops and video freezes for users located behind corporate firewalls. ICE candidate exchanges fail intermittently, and UDP media traffic 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 (Interactive Connectivity Establishment), STUN (Session Traversal Utilities for NAT), and TURN (Traversal Using Relay NAT) protocols to negotiate NAT traversal and establish the most efficient media paths. Call drops, video freezes, and failed meetings generally occur when ICE candidates cannot traverse corporate firewalls due to blocked UDP ports. Opening the required UDP ports for TURN/STUN traffic ensures that ICE candidates can successfully exchange between endpoints, enabling devices to discover direct media paths and maintain reliable signaling and media connectivity.

Option B, forcing users to connect via VPN, may bypass firewall restrictions but introduces additional latency, potential congestion, and higher operational overhead. VPNs can create bottlenecks for real-time media, leading to degraded audio/video quality. While it may temporarily resolve connectivity issues, it does not address the underlying firewall traversal problem and is not scalable for large enterprise deployments.

Option C, disabling ICE functionality, eliminates the protocol responsible for establishing optimal media paths. Without ICE, endpoints will struggle to negotiate NAT traversal, resulting in persistent call drops and poor media quality. Disabling ICE is counterproductive because it removes the primary mechanism designed to solve NAT and firewall traversal issues.

Option D, increasing TCP timeout values, impacts signaling reliability but does not resolve UDP media blockage. Real-time video and audio traffic relies heavily on UDP to minimize latency, and TCP adjustments do not address the inability to establish direct media paths.

By opening the required UDP ports for TURN/STUN traffic, enterprises enable proper ICE candidate exchange, ensuring that endpoints can discover and utilize the most efficient media paths. This approach improves call stability, video quality, and overall user experience while aligning with Cisco best practices for Webex Edge deployments. It provides a robust, scalable solution that addresses the root cause of the issue rather than temporary workarounds and ensures consistent collaboration performance across global locations.

Question213

A multinational organization deploying Cisco SD-WAN observes that video conferencing sessions experience intermittent packet loss and jitter, while general web traffic remains stable. Some overlay 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 for video traffic
D) Increase MTU size on overlay tunnels to reduce fragmentation

Answer: A

Explanation:

Video conferencing traffic is highly sensitive to latency, jitter, and packet loss, making performance optimization critical in SD-WAN environments. Intermittent packet loss and jitter occur when video traffic is unevenly distributed across overlay tunnels, leading to congestion on some paths while others remain underutilized. SLA-based application-aware routing provides the most effective solution by monitoring real-time WAN metrics such as latency, jitter, packet loss, and bandwidth availability. Traffic is dynamically steered across multiple overlay tunnels to paths that meet predefined performance thresholds, ensuring predictable quality for latency-sensitive video sessions.

Option B, forcing all video traffic over the highest-bandwidth tunnel, fails to address congestion dynamically. A single high-bandwidth tunnel may still experience latency spikes or packet loss during peak periods. Additionally, this approach underutilizes other available transport links, reducing overall WAN efficiency.

Option C, disabling dynamic path selection and using static routes, eliminates the adaptive capabilities of SD-WAN. Static routing cannot respond to changing network conditions, leaving video traffic exposed to congestion, jitter, and latency issues. Manual adjustments would be required, increasing operational complexity and delaying response to performance degradation.

Option D, increasing MTU size on overlay tunnels, addresses packet fragmentation but does not mitigate congestion, jitter, or latency. MTU tuning may slightly improve throughput for large packets but does not resolve the core issue of optimal path selection for real-time video traffic.

By implementing SLA-based application-aware routing, SD-WAN continuously evaluates path performance and routes video traffic dynamically to maintain low latency, minimal jitter, and reduced packet loss. This ensures high-quality video conferencing, maximizes overlay tunnel utilization, and provides consistent user experience even during peak network usage. SLA-based routing aligns network behavior with business priorities, optimizes transport resources, and maintains operational simplicity by automating traffic steering for critical real-time applications across complex WAN environments.

Question214

Remote Cisco Jabber clients behind NAT report intermittent registration failures and poor call quality. ICE candidate exchange fails sporadically, 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 located behind NAT rely on Expressway traversal zones to facilitate signaling, registration, and media flow. Registration failures and poor call quality typically occur when traversal zones are under-provisioned or ICE negotiation fails. Increasing traversal zone resources ensures sufficient capacity for concurrent registrations and media sessions, reducing the likelihood of dropped calls and registration failures. Enabling bidirectional ICE support allows clients to discover valid media paths through NAT/firewall devices, ensuring proper RTP flow and high-quality audio and video.

Option B, requiring VPN connectivity, bypasses NAT/firewall restrictions but introduces additional latency and potential congestion, negatively impacting real-time media quality. VPN deployment also increases operational overhead and is less scalable for remote users.

Option C, reducing CUCM SIP registration timers, increases registration retries but does not solve ICE or RTP path issues. Frequent retries may partially alleviate registration delays but cannot guarantee call quality or resolve underlying NAT traversal problems.

Option D, enabling persistent XMPP connections, improves messaging reliability but does not address ICE or RTP-related call quality issues. Real-time audio/video flows remain compromised if ICE candidates cannot be exchanged effectively.

Increasing traversal zone resources and enabling bidirectional ICE support addresses the root cause of Jabber registration failures and media degradation. This solution scales for large deployments, maintains predictable call quality, and aligns with Cisco best practices for enterprise collaboration. It provides a robust framework for ensuring reliable remote client connectivity without the operational drawbacks of VPN reliance or ineffective signaling tweaks.

Question215

An enterprise with a Cisco SD-WAN deployment experiences intermittent latency spikes and packet loss for critical ERP application traffic, 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 overlay tunnels to minimize fragmentation

Answer: A

Explanation:

ERP applications are highly sensitive to latency and packet loss. Intermittent spikes in these metrics negatively affect performance and productivity, especially when other types of traffic, such as web browsing, remain unaffected. SLA-based application-aware routing in SD-WAN allows traffic to be dynamically steered across multiple transport links based on real-time monitoring of latency, jitter, packet loss, and bandwidth availability. ERP traffic is prioritized on paths that meet predefined SLA thresholds, ensuring predictable application performance.

Option B, forcing all traffic over MPLS, provides a single high-quality path but does not leverage the full capability of SD-WAN. MPLS links may experience congestion during peak periods, and using a single transport link reduces overall WAN efficiency and increases operational cost.

Option C, configuring static routes and disabling dynamic path selection, removes SD-WAN intelligence. Static routes cannot adapt to transient network conditions, leaving ERP applications vulnerable to latency and packet loss, and require manual adjustments to maintain performance.

Option D, increasing MTU, addresses packet fragmentation but has little effect on latency, jitter, or path congestion. While it may improve efficiency for large packets, it does not ensure predictable performance for ERP applications, which are more sensitive to transport path conditions than packet size.

By implementing SLA-based application-aware routing, SD-WAN dynamically selects optimal paths for ERP traffic, minimizing latency, jitter, and packet loss. This ensures critical business applications maintain high performance, maximizes WAN efficiency, and provides operational simplicity by automating path selection based on real-time network conditions. SLA-based routing aligns IT operations with business priorities, delivering predictable application performance, optimizing resource utilization, and maintaining productivity for enterprise users.

Question216

A multinational company uses Cisco SD-WAN to connect branch offices and data centers. Users at multiple branches report inconsistent application performance for their cloud-based ERP application, especially during peak hours. The network engineer notices that overlay tunnels are underutilized, but latency and packet loss vary significantly between paths. Which solution MOST effectively ensures consistent performance for the ERP application?

A) Configure SLA-based application-aware routing for ERP traffic with appropriate thresholds
B) Route all ERP traffic exclusively over MPLS links to guarantee reliability
C) Disable dynamic path selection and configure static routes for ERP application traffic
D) Increase the MTU size of overlay tunnels to reduce fragmentation

Answer: A

Explanation:

ERP applications are critical for business operations and highly sensitive to network performance, particularly latency, jitter, and packet loss. In a Cisco SD-WAN deployment, inconsistent performance across overlay tunnels, even when bandwidth is sufficient, often indicates that traffic is not being steered according to application-specific SLA requirements. Implementing SLA-based application-aware routing for ERP traffic is the most effective solution because it allows the network to continuously monitor the real-time performance of all available WAN paths, including latency, jitter, packet loss, and bandwidth utilization. By defining specific thresholds for the ERP application, SD-WAN can dynamically steer traffic over the paths that meet the required performance standards, ensuring consistent application performance.

Option B, routing all ERP traffic exclusively over MPLS links, focuses on reliability by using a single transport type. However, this approach underutilizes other available WAN resources, such as broadband or LTE links, and does not leverage the dynamic path selection capabilities inherent in SD-WAN. While MPLS may offer predictable latency and reliability, it may also face congestion during peak hours, which could degrade ERP performance. Furthermore, limiting traffic to MPLS increases operational costs and reduces overall WAN flexibility.

Option C, disabling dynamic path selection and configuring static routes for ERP traffic, removes the network’s ability to respond to real-time changes in WAN conditions. Static routing cannot adapt to temporary spikes in latency or packet loss, leaving ERP traffic vulnerable to inconsistent performance. This approach increases operational overhead, as manual adjustments would be required whenever performance issues occur, and does not provide the real-time optimization necessary for critical applications.

Option D, increasing the MTU size of overlay tunnels, addresses packet fragmentation but does not resolve latency or congestion-related problems. While larger MTU can improve efficiency for large data packets, it has minimal impact on ERP performance, which is primarily influenced by transport path quality rather than packet size. Fragmentation issues are generally secondary to path selection when considering the real-time responsiveness required for enterprise applications.

By implementing SLA-based application-aware routing, the SD-WAN solution continuously evaluates path performance and dynamically steers ERP traffic over optimal links. This ensures that application users experience minimal latency and jitter, consistent throughput, and predictable performance even during peak traffic periods. SLA-based routing optimizes network resources, reduces operational complexity, and aligns network behavior with business priorities, providing a scalable and reliable approach to maintaining high performance for critical ERP applications across multiple branch offices.

Question217

During the deployment of Cisco Webex Edge for Devices, an organization observes frequent video freezes and audio gaps during meetings. Investigation reveals that ICE candidate negotiation occasionally fails and UDP media traffic is being blocked by corporate firewalls. Which action MOST effectively resolves this problem?

A) Open all required UDP ports for TURN/STUN traffic on corporate firewalls
B) Force all users to connect via VPN to bypass firewall restrictions
C) Disable ICE functionality on Webex Edge devices
D) Increase TCP timeout values for signaling traffic

Answer: A

Explanation:

Webex Edge for Devices relies on ICE (Interactive Connectivity Establishment) along with STUN and TURN protocols to enable NAT traversal and establish direct media paths. Frequent video freezes and audio gaps typically occur when ICE candidate negotiation fails, preventing devices from establishing optimal UDP media connections. Opening all required UDP ports for TURN/STUN traffic ensures that ICE candidates can successfully exchange between endpoints, allowing Webex Edge devices to discover direct or relay paths that maintain reliable audio and video connectivity.

Option B, forcing users to connect via VPN, may temporarily bypass firewall restrictions but introduces additional latency, potential congestion, and operational complexity. VPNs create a tunnel that encapsulates traffic, which can delay real-time media packets, degrade quality, and increase the likelihood of jitter and packet loss. Although VPNs can solve the immediate connectivity problem, they do not address the underlying firewall traversal issue, and relying solely on VPNs for a global deployment is not scalable.

Option C, disabling ICE functionality, is counterproductive because ICE is the mechanism that allows endpoints to negotiate the most efficient paths for media, especially when NAT or firewall devices are present. Without ICE, endpoints are unable to perform candidate exchange, resulting in persistent audio/video degradation and registration failures.

Option D, increasing TCP timeout values, affects signaling reliability but does not resolve blocked UDP media traffic. Real-time audio and video rely heavily on UDP for minimal latency, and adjusting TCP timeouts cannot overcome NAT or firewall traversal issues that prevent ICE negotiation.

By opening the required UDP ports for TURN/STUN traffic, organizations ensure ICE candidate exchanges are successful, allowing Webex Edge devices to establish optimal media paths. This approach reduces call drops, eliminates video freezes, and improves audio quality. It is scalable, aligns with Cisco best practices, and addresses the root cause of media path failures rather than relying on temporary workarounds or less efficient methods such as VPN tunnels. Implementing this solution provides a robust and consistent collaboration experience for remote and branch users while minimizing operational complexity.

Question218

A branch office using Cisco SD-WAN experiences intermittent latency and packet loss for video conferencing applications. Overlay tunnels show varying levels of congestion, while general web browsing remains unaffected. Which configuration MOST effectively addresses the issue?

A) Implement SLA-based application-aware routing for video traffic
B) Force all video traffic over the highest-bandwidth overlay tunnel
C) Disable dynamic path selection and configure static routes for video traffic
D) Increase MTU size on overlay tunnels to reduce fragmentation

Answer: A

Explanation:

Video conferencing applications are highly sensitive to latency, jitter, and packet loss. Intermittent performance issues arise when traffic is unevenly distributed across overlay tunnels, resulting in congestion on some paths while others remain underutilized. SLA-based application-aware routing in Cisco SD-WAN continuously monitors WAN path metrics, including latency, jitter, and packet loss, and dynamically directs video traffic over the paths that meet predefined performance thresholds. This ensures consistent video quality and minimizes interruptions during conferences.

Option B, forcing all video traffic over the highest-bandwidth tunnel, does not address congestion dynamically. A single tunnel may still experience packet loss or jitter during peak usage, and other overlay links remain underutilized, leading to inefficient WAN resource utilization.

Option C, disabling dynamic path selection and configuring static routes, removes SD-WAN’s adaptive capabilities. Static routing cannot respond to real-time network fluctuations, leaving video traffic vulnerable to performance degradation. Manual intervention would be required to adjust traffic paths, increasing operational complexity and delaying response to issues.

Option D, increasing MTU on overlay tunnels, addresses packet fragmentation but does not mitigate congestion, jitter, or latency. While it may improve throughput for large packets, it does not provide the real-time optimization necessary for latency-sensitive applications like video conferencing.

SLA-based application-aware routing enables SD-WAN to continuously evaluate WAN path conditions and dynamically steer video traffic to maintain low latency and minimal jitter. This ensures predictable and high-quality video communication, optimizes overlay tunnel utilization, and aligns network behavior with business priorities. It provides a scalable solution that improves user experience, maintains operational simplicity, and guarantees consistent performance for critical video applications in a multi-transport SD-WAN environment.

Question219

Remote Cisco Jabber clients report intermittent registration failures and degraded call quality when connecting from behind NAT. ICE candidate negotiation sometimes fails, and RTP streams are blocked. Which configuration MOST effectively resolves this problem?

A) Increase Expressway traversal zone resources and enable bidirectional ICE support
B) Require all Jabber clients 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:

Remote Jabber clients rely on Cisco Expressway traversal zones to establish signaling and media paths across NAT/firewall boundaries. Registration failures and degraded call quality occur when traversal zones are under-provisioned or ICE candidate negotiation fails. Increasing traversal zone resources ensures sufficient capacity for simultaneous registrations and media sessions, while enabling bidirectional ICE support allows Jabber clients to discover viable media paths through NAT/firewalls. This approach resolves registration failures, ensures reliable RTP streaming, and maintains high call quality.

Option B, requiring VPN connections, can bypass NAT/firewall issues but introduces latency and operational overhead. VPNs encapsulate real-time traffic, potentially causing additional jitter and packet loss, and are not scalable for large numbers of remote users.

Option C, reducing CUCM SIP registration timers, increases registration attempts but does not resolve underlying ICE or media path issues. Repeated registration attempts may improve temporary connectivity but fail to guarantee call quality or reliable media flow.

Option D, enabling persistent XMPP connections, improves messaging reliability but does not address ICE or RTP streaming problems. Real-time media still requires successful ICE negotiation to traverse NAT/firewalls effectively.

By increasing Expressway traversal zone resources and enabling bidirectional ICE, enterprises ensure reliable Jabber registration, maintain high-quality RTP streams, and provide a scalable, robust solution for remote client connectivity. This approach addresses the root cause of registration and call quality issues, aligns with Cisco best practices, and supports consistent collaboration for distributed workforces without relying on less efficient methods such as VPNs or frequent manual interventions.

Question220

An enterprise experiences intermittent latency spikes and packet loss for critical ERP traffic over a Cisco SD-WAN network, while general traffic remains unaffected. Which configuration MOST effectively resolves this issue?

A) Implement SLA-based application-aware routing for ERP traffic
B) Force all ERP traffic over MPLS links
C) Configure static routing for ERP traffic and disable dynamic path selection
D) Increase overlay tunnel MTU to minimize fragmentation

Answer: A

Explanation:

ERP applications are sensitive to latency and packet loss. Intermittent spikes in these metrics degrade user productivity and can impact business operations. SLA-based application-aware routing ensures ERP traffic is steered dynamically over paths that meet specific performance thresholds. SD-WAN continuously monitors path metrics, including latency, jitter, packet loss, and bandwidth utilization, and directs traffic to maintain predictable performance for ERP applications.

Option B, forcing ERP traffic over MPLS, limits traffic to a single transport type, which may still experience congestion and does not optimize available WAN resources. While MPLS may offer predictable performance, it reduces network efficiency and increases cost, particularly when other transport links are available.

Option C, configuring static routes and disabling dynamic path selection, eliminates the intelligence of SD-WAN. Static routing cannot respond to temporary spikes in latency or packet loss, leaving ERP traffic vulnerable. Manual adjustments increase operational overhead and delay response to network issues.

Option D, increasing MTU, addresses packet fragmentation but does not resolve latency or congestion. ERP performance is primarily influenced by path selection and network conditions, not packet size.

By implementing SLA-based application-aware routing, the SD-WAN network dynamically optimizes path selection for ERP traffic. This ensures minimal latency and packet loss, predictable application performance, efficient overlay utilization, and reduced operational complexity. SLA-based routing aligns IT operations with business priorities, ensuring reliable access to critical ERP applications and improving overall user productivity.

Question221

A financial institution uses Cisco SD-WAN to connect multiple branch offices and data centers. Users report intermittent slow response times for their customer management application, even though general internet browsing is normal. WAN monitoring shows that some overlay tunnels experience fluctuating latency and packet loss during peak hours. Which configuration MOST effectively addresses this issue?

A) Implement SLA-based application-aware routing for the customer management application traffic with appropriate performance thresholds
B) Route all application traffic exclusively over MPLS links to guarantee reliability
C) Disable dynamic path selection and configure static routes for application traffic
D) Increase the MTU size of overlay tunnels to reduce fragmentation

Answer: A

Explanation:

Enterprise applications, such as customer management systems, are highly sensitive to network performance metrics, especially latency, jitter, and packet loss. In an SD-WAN environment, fluctuating application performance often indicates that the network is not dynamically selecting paths based on real-time conditions. Implementing SLA-based application-aware routing allows the SD-WAN solution to continuously monitor each available path and route application traffic over links that meet predefined performance thresholds. By defining thresholds for latency, jitter, and packet loss, the network ensures that critical application traffic is consistently directed over the optimal path. This approach improves user experience and reduces application latency during peak hours while maintaining efficient use of WAN resources.

Option B, routing all application traffic over MPLS links, may provide more predictable latency than broadband links, but it does not utilize available overlay paths efficiently. Limiting traffic to MPLS increases operational costs, reduces redundancy, and does not fully leverage SD-WAN’s capability to dynamically steer traffic. During peak hours, MPLS may still experience congestion, and routing exclusively over MPLS does not provide the same responsiveness as SLA-based routing.

Option C, disabling dynamic path selection and using static routes, removes the SD-WAN network’s ability to respond to changing network conditions. Static routing cannot adapt to sudden latency spikes or packet loss, leaving application traffic vulnerable to performance degradation. This method increases administrative overhead because manual adjustments would be required whenever network conditions change.

Option D, increasing the MTU of overlay tunnels, addresses packet fragmentation but does not resolve latency or congestion issues that impact application performance. Fragmentation typically affects throughput for large packets, while the critical issue for customer management applications is real-time responsiveness.

By implementing SLA-based application-aware routing, the organization ensures that application traffic is dynamically steered over the best-performing paths. This reduces latency, prevents packet loss, and optimizes WAN resource utilization. SLA-based routing aligns network behavior with business priorities, providing reliable access to mission-critical applications and improving overall operational efficiency across multiple branches. This approach is scalable, reduces operational complexity, and ensures consistent application performance even under varying network conditions.

Question222

A company deploys Cisco Webex Edge for Devices to provide video collaboration in its offices. Users complain of intermittent video freezes and choppy audio during meetings. Network analysis shows that UDP media traffic is sometimes blocked by the corporate firewall, and ICE candidate negotiation occasionally fails. Which solution MOST effectively resolves this problem?

Answer: A

Explanation:

Webex Edge for Devices relies on ICE (Interactive Connectivity Establishment) along with STUN and TURN protocols to traverse NAT and firewall boundaries efficiently. ICE is responsible for identifying the most efficient path for real-time media traffic, enabling direct or relayed connections depending on network constraints. When UDP ports required for TURN/STUN are blocked, ICE candidate negotiation fails, resulting in choppy audio, video freezes, or dropped calls. Opening the necessary UDP ports ensures that ICE can exchange candidates successfully and that media streams traverse firewalls without obstruction. This approach addresses the root cause of media path failures and improves collaboration quality for all users.

Option B, forcing all users to connect via VPN, can bypass firewall restrictions but introduces additional latency, potential jitter, and bandwidth overhead. VPN encapsulation may degrade real-time media performance and is not scalable for large deployments, especially for remote or branch users who require low-latency connections for video meetings.

Option C, disabling ICE functionality, is counterproductive because ICE is the mechanism that allows Webex devices to dynamically determine the optimal media path. Without ICE, endpoints cannot negotiate direct or relayed connections through NAT/firewalls, resulting in persistent media issues.

Option D, increasing TCP timeout values, only affects signaling reliability and has no effect on real-time UDP media streams. Since audio and video rely primarily on UDP for low-latency delivery, adjusting TCP parameters does not resolve the underlying media connectivity issues caused by blocked UDP ports.

Opening the required UDP ports for TURN/STUN traffic aligns with Cisco best practices and ensures that Webex Edge devices can establish direct or relay connections efficiently. This configuration reduces call drops, eliminates video freezes, and improves audio quality across multiple sites. By enabling successful ICE negotiation, organizations provide a robust and scalable video collaboration experience that maximizes the capabilities of Webex Edge while minimizing operational complexity and reliance on workarounds like VPN tunneling.

Question223

A branch office using Cisco SD-WAN reports inconsistent quality for video conferencing applications during peak usage, although web traffic remains unaffected. Overlay tunnels indicate varying levels of congestion. Which configuration MOST effectively resolves the problem?

Answer: A

Explanation:

Video conferencing is highly sensitive to latency, jitter, and packet loss. In an SD-WAN deployment, inconsistent video performance typically indicates that overlay traffic is not being dynamically steered based on real-time network conditions. SLA-based application-aware routing allows the network to monitor each overlay tunnel’s performance metrics and dynamically direct video traffic over paths that meet defined SLA thresholds for latency, jitter, and packet loss. This ensures consistent video quality and prevents performance degradation during peak usage.

Option B, forcing all video traffic over the highest-bandwidth overlay tunnel, does not account for fluctuating network conditions. Even the highest-bandwidth tunnel may experience congestion, resulting in video degradation, while other available tunnels remain underutilized. This approach reduces network efficiency and does not fully leverage the dynamic path selection capabilities of SD-WAN.

Option C, disabling dynamic path selection and using static routes, removes the network’s ability to respond to real-time conditions. Static routing cannot adapt to spikes in latency or packet loss, leaving video traffic vulnerable to poor performance. Manual intervention would be necessary to address issues, increasing operational complexity and potentially causing delays in resolving video degradation.

Option D, increasing MTU on overlay tunnels, may reduce fragmentation but does not address congestion, latency, or jitter, which are the primary factors affecting video conferencing quality. MTU adjustments provide minimal benefit for real-time applications compared to SLA-based dynamic routing.

SLA-based application-aware routing continuously evaluates overlay tunnel performance and steers video traffic over the best-performing paths. This approach ensures predictable video quality, efficient overlay utilization, and alignment of network behavior with business priorities. It provides a scalable, automated solution that reduces operational complexity and maintains consistent performance for latency-sensitive applications in multi-transport SD-WAN environments.

Question224

Remote Cisco Jabber clients experience intermittent registration failures and poor call quality when connecting from behind NAT. ICE candidate negotiation sometimes fails, and RTP streams are blocked. Which configuration MOST effectively resolves this problem?

Answer: A

Explanation:

Jabber clients behind NAT rely on Cisco Expressway traversal zones for signaling and media traversal. Registration failures and degraded call quality occur when ICE negotiation fails or when traversal zones are under-provisioned. Increasing Expressway traversal zone resources ensures adequate capacity for registrations and media sessions, while enabling bidirectional ICE allows Jabber clients to discover viable media paths through NAT/firewalls. This approach addresses registration issues, ensures reliable RTP streaming, and maintains high call quality.

Option B, requiring VPN connections, circumvents NAT/firewall traversal issues but introduces additional latency, potential jitter, and increased operational complexity. VPN tunnels can degrade real-time media performance and are not scalable for large numbers of remote users.

Option C, reducing CUCM SIP registration timers, increases registration frequency but does not resolve ICE negotiation or RTP streaming problems. Repeated registration attempts may temporarily improve connectivity but cannot guarantee consistent call quality.

Option D, enabling persistent XMPP connections, improves messaging reliability but does not resolve ICE or RTP media path issues. Real-time audio and video require successful ICE negotiation to traverse NAT/firewalls effectively.

Increasing traversal zone resources and enabling bidirectional ICE provides a scalable and robust solution. It ensures reliable Jabber registration, maintains high-quality RTP streams, reduces operational overhead, and aligns with Cisco best practices. This configuration addresses the root causes of registration and call quality issues for remote clients without relying on less efficient methods such as VPNs or frequent manual interventions.

Question225

An enterprise observes intermittent latency spikes and packet loss for critical ERP traffic over its Cisco SD-WAN network, while general web traffic remains unaffected. Which configuration MOST effectively addresses this issue?

Answer: A

Explanation:

ERP applications are highly sensitive to latency and packet loss. Intermittent spikes in these metrics negatively impact user productivity and business operations. SLA-based application-aware routing allows the SD-WAN solution to continuously monitor path performance, including latency, jitter, packet loss, and bandwidth utilization, and dynamically steer ERP traffic over the optimal paths. This ensures predictable performance, minimal latency, and low packet loss for critical ERP applications.

Option B, forcing ERP traffic over MPLS links, limits path selection and underutilizes available broadband or LTE links. While MPLS may provide predictable performance, it does not fully leverage SD-WAN’s dynamic path optimization capabilities and increases operational cost.

Option C, static routing and disabling dynamic path selection, removes the adaptive intelligence of SD-WAN. Static paths cannot respond to transient latency spikes or packet loss, leaving ERP traffic susceptible to performance degradation and increasing operational overhead.

Option D, increasing overlay tunnel MTU, addresses packet fragmentation but does not resolve latency or congestion. ERP performance relies primarily on path quality, and MTU adjustments provide minimal benefit compared to SLA-based routing.

By implementing SLA-based application-aware routing, SD-WAN dynamically optimizes paths for ERP traffic, ensuring low latency, reduced packet loss, efficient overlay utilization, and alignment with business priorities. This approach improves operational efficiency, maintains consistent application performance, and provides a scalable, automated solution for critical ERP applications across multiple branches.

ERP (Enterprise Resource Planning) applications are highly sensitive to network latency, jitter, and packet loss. Even minor fluctuations in these performance metrics can result in application delays, failed transactions, or poor user experience. In the scenario described, ERP traffic experiences intermittent latency spikes and packet loss, whereas other types of traffic remain unaffected. This indicates that the issue is not general network congestion but rather path-specific variability affecting latency-sensitive traffic. SD-WAN solutions provide the ability to monitor real-time network metrics and intelligently route traffic based on application-specific performance requirements. SLA-based application-aware routing is the mechanism by which SD-WAN ensures that critical applications such as ERP maintain predictable performance across a dynamic WAN environment.

Option A, implementing SLA-based application-aware routing for ERP traffic, directly addresses this problem. SLA-based routing enables the SD-WAN solution to continuously measure latency, jitter, packet loss, and available bandwidth on all available paths. Based on these measurements and predefined SLA thresholds, the SD-WAN controller dynamically directs ERP traffic over the optimal path that meets the required performance criteria. For instance, if an MPLS link experiences temporary congestion or latency spikes, the SD-WAN fabric can reroute ERP traffic over a broadband or LTE path that satisfies the SLA. This ensures that ERP applications operate with low latency, minimal packet loss, and consistent performance. The solution not only guarantees optimal performance for ERP applications but also maximizes WAN resource utilization by dynamically balancing traffic across all available links. This capability allows enterprises to leverage multiple transport types efficiently while maintaining predictable application performance.

Option B, forcing all ERP traffic over MPLS links, is a static approach that limits flexibility and underutilizes other transport options. While MPLS may provide predictable performance under normal conditions, it does not dynamically adapt to temporary congestion, packet loss, or link degradation. If the MPLS path becomes degraded, ERP performance will suffer because traffic is restricted to that single path. Additionally, forcing all ERP traffic over MPLS increases operational costs, as enterprises must maintain expensive dedicated circuits even when alternative broadband or LTE paths could satisfy performance requirements. This approach is inefficient and negates one of the core advantages of SD-WAN, which is the ability to leverage multiple transport links intelligently.

Option C, configuring static routing for ERP traffic and disabling dynamic path selection, similarly removes SD-WAN intelligence. Static paths cannot respond to network variability or transient performance issues, leaving ERP traffic vulnerable to latency spikes and packet loss. Operationally, static routing increases administrative overhead, as network teams must manually adjust routes in response to changing network conditions. This method lacks scalability and does not provide the automated path optimization necessary to maintain consistent ERP performance in a dynamic WAN environment. It also increases the likelihood of SLA violations and degraded business processes because path selection does not adapt to real-time performance metrics.

Option D, increasing the overlay tunnel MTU to minimize fragmentation, addresses a completely different aspect of network performance. While larger MTU values can reduce packet fragmentation and improve throughput for large data transfers, this adjustment does not solve issues related to path latency, jitter, or packet loss. ERP applications are sensitive primarily to path quality and consistent delivery times rather than packet size, making MTU optimization only a minor consideration. While proper MTU configuration is important for efficient overlay operations, it does not provide the dynamic, SLA-driven path optimization needed to ensure predictable ERP performance.

From an operational perspective, SLA-based routing reduces troubleshooting and monitoring complexity. Administrators can focus on strategic tasks rather than manually monitoring each WAN link for latency spikes or congestion. The SD-WAN controller provides real-time telemetry and alerts when SLA thresholds are approached or violated, enabling proactive adjustments before users experience application degradation. This capability also improves overall business continuity by ensuring that ERP-dependent processes operate smoothly and reliably, minimizing the risk of productivity loss, delayed decision-making, and operational disruptions.

Cisco 350-801 Implementing Cisco Collaboration Core Technologies (CLCOR) Exam Dumps and Practice Test Questions Set 15 Q211-225

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