Curriculum For This Course
Video tutorials list
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ACI Fabric Infrastructure
Video Name Time 1. Course Introduction 2:00 2. What is ACI Ver 01 9:00 3. What is ACI Ver 02 9:00 4. ACI Topology & hardware 01 9:00 5. ACI Topology & hardware 02 8:00 6. ACI Topology & hardware 03 8:00 7. ACI Topology & hardware 04 15:00 8. ACI Object Model 8:00 9. Managed object 3:00 10. ACI object Programming options part 01 6:00 11. ACI object P2rogramming options part 02 9:00 12. 1.3 Utilize faults, event record, and audit log 11:00 13. 1.4 Describe ACI fabric discovery 1:00 14. ACI Bring up process Theory part 01 9:00 15. Bring up process Part 02 5:00 16. ACI Fabric Discovery 8:00 17. Section 5 & 6 2:00 18. ACI Constructs 10:00 19. Fabric Access Policies 8:00 20. ACI Layer 2 Connectivity 13:00 21. Bare Metal Lab Theory 5:00 22. Bare Metal Lab Part01 12:00 23. Bare Metal Lab Part02 7:00 24. Bare Metal Lab Part03 different EPG 16:00 25. Summary of this Section 2:00 -
ACI Packet Forwarding
Video Name Time 1. Section 2.0 ACI Packet Forwarding 1:00 2. What is ACI Endpoint 9:00 3. what is vxlan 12:00 4. vxlan encapsulation 7:00 5. Section 2.2 ACI Overlay Vxlan & TEP 01 8:00 6. ACI Overlay Vxlan & TEP 02 10:00 7. Endpoint EPG EP Learning & COOP 14:00 8. Endpoint Learning 11:00 9. BD & VRF Forwarding Scope 13:00 10. ACI BD Forwarding option 7:00 11. Spine-Proxy & Arp Glean 5:00 12. Forwarding Software Architecture & ASIC Generation 6:00 13. ACI Packet Walk 8:00
300-620: Implementing Cisco Application Centric Infrastructure (DCACI) Certification Training Video Course Intro
Certbolt provides top-notch exam prep 300-620: Implementing Cisco Application Centric Infrastructure (DCACI) certification training video course to prepare for the exam. Additionally, we have Cisco DCACI 300-620 exam dumps & practice test questions and answers to prepare and study. pass your next exam confidently with our 300-620: Implementing Cisco Application Centric Infrastructure (DCACI) certification video training course which has been written by Cisco experts.
300-620: Implementing Cisco Application Centric Infrastructure (DCACI) Certification Training
The 300-620 DCACI: Implementing Cisco Application Centric Infrastructure certification validates your skills in configuring, managing, and troubleshooting Cisco’s next-generation data center solution — Cisco ACI (Application Centric Infrastructure). This official Cisco Data Center certification course prepares you to deploy scalable, policy-based network automation for modern hybrid cloud environments.
Course Overview
The 300-620 Implementing Cisco Application Centric Infrastructure (DCACI) course is an essential step for IT professionals looking to master Cisco’s next-generation data center architecture built around policy-driven automation and centralized management. Cisco Application Centric Infrastructure, or Cisco ACI, represents a revolutionary approach to modern networking by merging software and hardware to create a fully automated and scalable network environment. This certification course provides comprehensive knowledge of how to deploy, configure, and manage Cisco ACI in enterprise data centers. It focuses on understanding the fabric architecture, configuring policies, and applying application-centric concepts to simplify complex network management tasks.
This training aligns with Cisco’s official blueprint for the 300-620 DCACI exam, one of the core requirements for achieving the CCNP Data Center certification. It’s designed for networking professionals who want to develop hands-on expertise in managing data center fabrics using Cisco Nexus 9000 Series switches operating in ACI mode. Through a combination of theoretical knowledge and real-world lab exercises, learners gain a complete understanding of how to integrate ACI into existing infrastructures and ensure network agility, scalability, and security.
The course also emphasizes the transition from traditional networking methods to a policy-based model where applications drive network configurations rather than manual device-level operations. Participants learn to design, deploy, and troubleshoot ACI fabrics, manage tenants and policies, and integrate the ACI environment with external networks and services. The skills developed during this training directly contribute to improved operational efficiency and help engineers prepare for the growing demands of cloud-based and hybrid data center environments.
What you will learn from this course
• Understanding Cisco ACI architecture, components, and fabric design principles
• Deploying and managing Cisco Nexus 9000 Series switches in ACI mode
• Exploring the Cisco Application Policy Infrastructure Controller (APIC) and its functions
• Configuring tenants, application profiles, and endpoint groups
• Implementing access policies, bridge domains, and contracts
• Integrating ACI with Layer 2 and Layer 3 external networks
• Using service graphs and integrating virtual and physical workloads
• Monitoring, troubleshooting, and maintaining the ACI fabric
• Automating ACI operations with REST APIs, Python scripts, and Ansible
• Preparing for the Cisco 300-620 DCACI certification exam through practical labs and exercises
Learning Objectives
The main goal of this course is to ensure learners gain the technical proficiency required to implement and manage Cisco Application Centric Infrastructure in real-world scenarios. By the end of the program, participants will have a solid grasp of ACI’s architectural framework, its policy model, and its operational workflows. Students will be able to explain how Cisco ACI simplifies network provisioning through centralized automation and policy enforcement. They will also understand how to create and manage application profiles that define relationships between workloads and services within the fabric.
Another important learning objective is mastering how Cisco ACI integrates with external environments. Participants will learn to connect ACI fabrics to existing enterprise networks, external Layer 3 routers, and cloud platforms. Additionally, learners will develop the skills needed to use Cisco APIC for managing configurations, deploying changes, and troubleshooting issues. The course emphasizes practical knowledge so students can confidently perform implementation tasks using Cisco’s recommended best practices.
This course is structured to enhance not only theoretical understanding but also the ability to execute complex ACI deployments independently. Learners gain experience in identifying and resolving connectivity issues, implementing policies, managing tenant configurations, and securing the data center fabric. Through repeated exposure to real-world examples, learners leave the course ready to apply these skills in production environments or to advance their professional certifications.
Requirements
Participants are expected to come with a foundational understanding of data center technologies, networking fundamentals, and IP addressing. Familiarity with VLANs, routing concepts, and network automation principles is helpful but not mandatory. A basic awareness of virtualization technologies and cloud computing concepts will also assist learners in grasping ACI’s multi-domain integration capabilities.
Access to a computer system with stable internet connectivity is essential for those taking the course in an online or blended format. For learners participating in instructor-led sessions, a standard workstation with remote access to virtual labs or physical lab equipment will be provided. Cisco recommends using modern browsers and updated software tools for lab exercises involving APIC and Cisco Nexus switches. While prior experience with Cisco Nexus platforms can enhance learning speed, the course is structured to guide learners step-by-step from foundational topics to advanced ACI implementation techniques.
Additionally, learners are encouraged to review Cisco’s foundational courses such as Implementing and Operating Cisco Data Center Core Technologies (DCCOR) to ensure they are familiar with essential concepts like data center networking, storage, and compute fundamentals. This foundation ensures smoother progress when learning about policy-driven automation and ACI fabric configurations.
Course Description
This course takes an in-depth approach to explaining Cisco Application Centric Infrastructure from both theoretical and practical perspectives. Cisco ACI introduces a paradigm shift from traditional data center networking by focusing on policies that define how applications interact with the network. Instead of manually configuring each network device, administrators use centralized controllers to automate provisioning, monitoring, and configuration changes across the entire fabric.
Throughout this training, learners explore Cisco ACI’s three key components: the Application Policy Infrastructure Controller (APIC), the spine and leaf switch architecture, and the policy model that defines communication rules. Students study how to build an ACI fabric, configure tenants and bridge domains, and implement contracts that define relationships between application components. The course also covers the integration of physical and virtual environments, ensuring learners understand how ACI supports modern cloud-driven data centers.
In addition to configuration and deployment, the curriculum dives into operations and troubleshooting. Participants will learn to use ACI tools for monitoring health scores, identifying faults, and diagnosing connectivity issues. By the end of the course, learners will have the ability to design and implement secure, scalable, and automated data center networks using Cisco’s ACI platform. The hands-on labs simulate real-world challenges, allowing learners to apply theory to practice while reinforcing their understanding of key ACI features.
Target Audience
The course is designed for a range of professionals who work with or aspire to work in enterprise data center environments. Network engineers, systems engineers, and data center administrators will find this course particularly valuable for expanding their technical expertise in Cisco’s advanced networking technologies. The training is equally beneficial for consultants, technical architects, and IT professionals responsible for deploying or maintaining large-scale data centers.
Professionals pursuing the CCNP Data Center certification or those seeking specialization in ACI implementation will find this program essential. Network automation engineers and DevOps professionals can also benefit, as the course introduces automation frameworks and scripting tools that integrate with Cisco ACI. Even individuals who have experience with traditional data center infrastructures but want to transition to software-defined networking will gain significant insight from this training.
Because ACI represents a convergence of networking, automation, and application management, the course appeals to anyone who wants to build or maintain agile, application-driven data centers. IT teams looking to streamline operations, improve scalability, and support digital transformation initiatives can greatly benefit from mastering the concepts covered in this course.
Perequistes
Before enrolling in this course, learners should possess a solid understanding of fundamental networking principles, including Ethernet, TCP/IP, and routing protocols such as OSPF or BGP. Familiarity with Cisco data center products, particularly Cisco Nexus switches, will be advantageous. It’s recommended that students complete the Implementing and Operating Cisco Data Center Core Technologies (DCCOR) course to establish a strong base in networking, virtualization, and automation concepts.
While the DCACI course introduces automation tools, having prior exposure to Python scripting or REST APIs can help learners grasp automation concepts more quickly. Basic knowledge of virtualization technologies, such as VMware or Hyper-V, will also be useful when learning about integrating ACI with virtualized workloads. Participants should be comfortable with command-line interfaces and navigating Cisco’s configuration environments.
Understanding general data center operations, including VLAN management, Layer 2/3 connectivity, and security policies, will help learners relate the theoretical aspects of ACI to practical implementation scenarios. These prerequisites ensure that participants can maximize their learning outcomes and progress efficiently through the advanced material covered in the course.
Course Modules/Sections
The course is divided into comprehensive modules designed to cover all areas of Cisco ACI implementation and management. Each section builds progressively on the previous one, allowing learners to develop both foundational and advanced skills in an organized sequence.
The first module introduces the Cisco ACI architecture, exploring the relationship between physical and logical components within the fabric. Learners study how the spine-leaf topology ensures high performance and scalability. The second module delves into APIC configuration, detailing its role in policy enforcement and network automation. The third section focuses on fabric discovery and registration, where participants learn to connect and integrate Cisco Nexus 9000 Series switches into the ACI environment.
Subsequent modules explore tenant creation, bridge domain configuration, and endpoint group management. The course also dedicates sections to integrating external Layer 2 and Layer 3 networks, service insertion using service graphs, and configuring contracts to control inter-application communication. Learners are introduced to ACI automation frameworks, covering topics such as REST APIs, Python, and Ansible integration.
Toward the later sections, participants engage with operational management, troubleshooting, and monitoring practices. They learn how to use APIC tools to analyze health scores, detect faults, and maintain consistent performance across the network fabric. The course concludes with advanced labs that simulate enterprise-grade deployment scenarios, reinforcing the learner’s ability to design and implement robust ACI environments.
Key Topics Covered
This program encompasses a wide range of topics, all critical to mastering Cisco ACI and succeeding in the 300-620 DCACI certification exam. Some of the key subjects include Cisco ACI architecture and components, understanding the APIC’s functions, fabric initialization, and policy model fundamentals. Learners explore how application profiles, endpoint groups, bridge domains, and contracts interconnect to deliver application-centric services.
Other essential topics include external network connectivity, virtual machine manager integration, Layer 2 and Layer 3 configuration, and tenant isolation. Participants also study service graphs, enabling advanced service chaining and dynamic policy enforcement between workloads. The course further examines fault management, event recording, and health monitoring mechanisms used in ACI to ensure operational visibility and performance assurance.
Automation and programmability form another major topic area, providing learners with exposure to REST APIs, scripting, and integration tools. By covering these areas, learners are prepared to manage complex deployments, automate network provisioning, and troubleshoot multi-tenant environments effectively. All topics align with Cisco’s official exam objectives, ensuring students gain the practical and theoretical knowledge needed to pass the DCACI certification exam confidently.
Teaching Methodology
This course uses a blended teaching methodology that combines theoretical instruction with practical hands-on exercises. The learning process emphasizes comprehension through active engagement, ensuring participants not only understand ACI concepts but also apply them in real-world scenarios. Instructor-led sessions are structured around core lectures supported by live demonstrations and interactive discussions. These discussions encourage learners to ask questions, share experiences, and clarify concepts in real time.
A major part of the learning experience involves hands-on labs designed to replicate actual enterprise data center environments. Learners gain practical experience configuring Cisco ACI fabrics, deploying policies, and troubleshooting connectivity issues using Cisco APIC and Nexus 9000 switches. These labs bridge the gap between theory and practice, providing the necessary technical skills to manage complex networks effectively.
In addition to instructor guidance, the course incorporates self-paced study modules that allow learners to review material independently. Video tutorials, reference guides, and interactive simulations support continuous learning. This flexible approach accommodates different learning preferences and ensures participants retain critical knowledge long after completing the training.
Assessment & Evaluation
Assessment within this course focuses on ensuring participants can demonstrate both conceptual understanding and practical ability. Learners are evaluated through quizzes, configuration exercises, and lab-based assessments that mirror real-world scenarios. Each assessment is designed to measure progress across key competencies, such as configuring APIC policies, managing tenants, and integrating external networks.
Instructors provide feedback and guidance throughout the course to help learners improve their understanding of challenging topics. Final evaluations typically involve comprehensive lab tasks that test end-to-end ACI deployment and troubleshooting skills. This practical assessment method ensures participants are prepared to perform independently in real operational environments.
Successful completion of the training also positions learners to confidently attempt the official Cisco 300-620 DCACI certification exam. While the course is not an exam itself, it directly aligns with Cisco’s objectives, ensuring participants are well-equipped to pass the exam and apply their knowledge in professional roles.
Benefits of the course
Enrolling in the Cisco 300-620 DCACI: Implementing Cisco Application Centric Infrastructure course provides a wide range of benefits that extend beyond passing the certification exam. One of the most significant advantages is the deep understanding of Cisco ACI architecture and policy-driven networking. Participants gain hands-on experience in designing, deploying, and managing ACI fabrics, which enhances their ability to streamline data center operations and reduce operational overhead. This expertise equips learners to handle the complexities of modern enterprise data centers that rely heavily on automation, virtualization, and hybrid cloud integrations.
Another key benefit of the course is career advancement. Cisco ACI is one of the most sought-after skills in data center networking today, and completing this course demonstrates your ability to manage application-centric networks efficiently. Organizations increasingly prioritize professionals who can implement scalable, automated, and secure data center solutions, and this training positions learners to meet those demands. Beyond technical knowledge, participants also develop problem-solving and analytical skills as they learn to troubleshoot and optimize ACI environments, making them invaluable assets to any IT team.
The course also offers significant practical advantages through its hands-on lab exercises. Learners are exposed to real-world deployment scenarios that simulate the operational challenges of enterprise networks. This practical experience enables students to translate theoretical concepts into actionable skills, ensuring they can perform complex tasks independently after course completion. Furthermore, understanding Cisco ACI allows learners to integrate policy-driven network management with existing infrastructure, supporting hybrid cloud strategies and enhancing organizational agility.
Another benefit is the exposure to automation and programmability. Participants learn to utilize REST APIs, Python scripts, and other automation tools to simplify routine tasks and reduce the likelihood of configuration errors. This knowledge not only improves operational efficiency but also prepares learners for roles in network automation and DevOps environments. By mastering these automation techniques, professionals gain a competitive edge in the job market, as organizations increasingly adopt software-defined networking and automated management systems.
Additionally, completing the course provides learners with a structured learning path toward the Cisco 300-620 DCACI certification and the broader CCNP Data Center specialization. The alignment of course content with Cisco’s exam objectives ensures that learners are fully prepared for the certification, reinforcing both theoretical knowledge and practical skills. Achieving this certification signals professional credibility, boosts career growth, and opens doors to advanced networking opportunities within large enterprises and multinational corporations.
In summary, the benefits of the Cisco 300-620 DCACI course encompass technical proficiency, practical experience, career advancement, exposure to automation, and alignment with certification goals. Participants leave the program equipped to manage complex data center environments, implement robust ACI solutions, and pursue professional opportunities that require advanced networking expertise.
Course Duration
The Cisco 300-620 DCACI course is typically structured to be completed over a period of five to seven days for instructor-led sessions, although online self-paced options are available to accommodate different learning schedules. The duration is designed to balance theoretical instruction with hands-on practice, allowing learners to gain comprehensive knowledge of Cisco ACI architecture and deployment. Each day of the course combines lectures, demonstrations, and lab exercises to reinforce learning objectives and provide practical experience.
The course schedule is organized to gradually increase in complexity, beginning with foundational concepts such as the basic architecture of Cisco ACI, the roles of spine and leaf switches, and an overview of the APIC controller. Subsequent modules delve deeper into tenant creation, bridge domain configuration, and endpoint group management, ensuring learners build confidence and competence before tackling more advanced topics such as service graphs, external network integration, and automation techniques.
For online or self-paced learners, the course duration may vary depending on the participant’s prior experience and learning pace. Some learners may complete the course in a shorter period if they already possess strong networking fundamentals and familiarity with Cisco Nexus platforms. Conversely, learners new to Cisco data center technologies may require additional time to absorb the material fully and practice hands-on lab exercises.
The duration also includes time for assessments and knowledge reinforcement. Quizzes, lab evaluations, and review sessions are incorporated to ensure learners achieve mastery of critical concepts before progressing to subsequent modules. This structured approach ensures that all participants, regardless of experience level, acquire the necessary skills to implement, manage, and troubleshoot Cisco ACI fabrics effectively.
In addition, the duration is sufficient to provide exposure to automation and programmability aspects of ACI, including using REST APIs, Python scripting, and integration with Ansible. Learners have the opportunity to practice automating network tasks, monitoring fabric health, and troubleshooting configurations in simulated enterprise environments. By dedicating adequate time to these exercises, participants develop the confidence and proficiency required to manage ACI deployments in real-world data centers.
Ultimately, the course duration is designed to balance theory and practice, ensuring learners acquire a thorough understanding of Cisco ACI concepts, develop hands-on skills, and prepare for the 300-620 DCACI certification exam. Whether taken in a classroom setting or online, the structured time allocation guarantees comprehensive coverage of all critical topics while allowing learners to absorb and apply the knowledge effectively.
Tools & Resources Required
To maximize the learning experience, participants require access to several tools and resources that facilitate hands-on practice and theoretical understanding. A core requirement is a computer with stable internet connectivity, capable of running virtual lab environments or accessing cloud-based Cisco ACI labs. Modern browsers and updated operating systems are essential for seamless interaction with virtual APIC instances and Nexus switch simulations.
For in-person or instructor-led sessions, physical lab equipment may be provided, including Cisco Nexus 9000 Series switches and APIC controllers. These devices allow learners to practice real configuration tasks and explore the nuances of policy-driven networking in a controlled environment. Hands-on lab exercises simulate enterprise-scale networks, enabling participants to experience realistic deployment challenges and operational troubleshooting scenarios.
Virtual lab platforms are another critical resource, particularly for online learners. These platforms provide remote access to fully configured ACI environments, allowing students to practice fabric deployment, tenant configuration, policy management, and troubleshooting exercises. Virtual labs ensure that learners can gain practical experience without the logistical constraints of physical hardware, while also providing a scalable environment for repeated practice.
Documentation and reference materials are essential resources for reinforcing learning. Cisco provides official guides, configuration manuals, and whitepapers that explain ACI architecture, deployment strategies, and best practices. Participants are encouraged to refer to these resources alongside the course lectures and labs to deepen their understanding and develop proficiency in implementing complex solutions.
Automation tools such as Python scripts, REST APIs, and Ansible modules are also integral to the course. Learners gain exposure to these resources to automate configuration tasks, monitor fabric health, and integrate ACI with other network management systems. Familiarity with scripting environments and API testing tools ensures that participants can fully leverage ACI’s programmability features and streamline operational workflows.
By combining these tools and resources, learners can practice configuring, managing, and troubleshooting Cisco ACI fabrics effectively. The availability of both physical and virtual labs, comprehensive documentation, and automation frameworks ensures that participants develop the technical skills necessary to succeed in professional roles and achieve the 300-620 DCACI certification.
Career Opportunities
Completing the Cisco 300-620 DCACI course opens numerous career opportunities in networking, data center management, and network automation. Professionals with expertise in Cisco ACI are in high demand as organizations modernize their data centers and adopt software-defined networking solutions. Network engineers, data center administrators, and IT consultants who complete this course position themselves for advanced roles requiring policy-driven network management and operational automation.
One of the most common career paths is that of a Data Center Engineer. These professionals are responsible for designing, deploying, and maintaining data center fabrics, ensuring network availability, performance, and security. A deep understanding of Cisco ACI enables engineers to implement scalable, automated, and application-centric networks that support business-critical workloads efficiently.
Network automation engineers are another growing opportunity. Professionals in this role leverage automation tools, scripting, and APIs to streamline network operations, reduce human error, and increase agility. The DCACI course provides the foundational skills necessary for automating Cisco ACI deployments, integrating with DevOps workflows, and applying programmatic management to complex enterprise networks.
Infrastructure architects and technical consultants also benefit from this certification. They design enterprise-grade solutions that integrate ACI fabrics with cloud platforms, virtualization technologies, and hybrid networking environments. Certification in DCACI demonstrates credibility and technical expertise, enabling these professionals to advise organizations on best practices for scalable and secure data center deployments.
Additionally, professionals aiming for Cisco CCNP Data Center specialization or higher-level certifications, such as CCIE Data Center, find the 300-620 DCACI course to be an essential building block. It provides the practical knowledge and exam preparation needed to progress toward these advanced credentials, enhancing career growth, earning potential, and professional recognition.
Organizations increasingly seek professionals with ACI expertise to support digital transformation initiatives, implement cloud-ready data centers, and manage multi-tenant environments. By completing this course, learners are equipped to take on challenging roles that involve policy-based network management, tenant isolation, and automated operations, all of which are critical in today’s technology-driven business landscape.
In addition to technical roles, the certification also opens opportunities in project management, IT consulting, and solution architecture. Professionals can lead or support enterprise-level ACI deployments, develop standard operating procedures for network management, and provide strategic guidance on optimizing network performance. The combination of hands-on skills, theoretical knowledge, and industry-recognized certification positions learners for diverse career opportunities across multiple IT domains.
Enroll Today
Enrolling in the Cisco 300-620 DCACI course is the first step toward mastering Cisco Application Centric Infrastructure and advancing your career in data center networking. The course provides a comprehensive blend of theoretical knowledge, practical lab exercises, and exposure to automation tools, ensuring participants gain the skills necessary to design, deploy, and manage ACI fabrics effectively.
Registration for the course is straightforward, with options available for instructor-led sessions, online self-paced modules, or blended learning formats. Each option provides access to the necessary tools, resources, and expert guidance required for successful learning. By enrolling today, learners can begin developing the technical expertise needed to implement ACI solutions, prepare for the 300-620 DCACI certification exam, and explore advanced networking career opportunities.
Participants benefit from structured training that aligns with Cisco’s official exam objectives, offering a clear pathway toward certification. The combination of hands-on labs, practical exercises, and access to reference materials ensures that learners not only understand theoretical concepts but can also apply them in real-world scenarios.
Moreover, early enrollment allows learners to take advantage of ongoing support, including instructor feedback, peer discussion forums, and access to virtual lab environments. These resources enhance the learning experience and ensure that participants can practice, experiment, and reinforce their skills until they achieve mastery.
Completing the course also positions professionals to take immediate steps toward Cisco certification, opening doors to higher-level technical roles and increased earning potential. Whether pursuing a career as a data center engineer, network automation specialist, infrastructure architect, or consultant, enrolling in the Cisco 300-620 DCACI course equips learners with the knowledge, confidence, and credibility to succeed in today’s competitive IT landscape.
The course also fosters lifelong learning by providing a strong foundation for future certifications, advanced courses, and specialized training in areas such as network automation, software-defined networking, and cloud integration. By enrolling today, participants commit to professional growth, continuous skill development, and positioning themselves as experts in Cisco ACI and modern data center networking technologies.
Certbolt's total training solution includes 300-620: Implementing Cisco Application Centric Infrastructure (DCACI) certification video training course, Cisco DCACI 300-620 practice test questions and answers & exam dumps which provide the complete exam prep resource and provide you with practice skills to pass the exam. 300-620: Implementing Cisco Application Centric Infrastructure (DCACI) certification video training course provides a structured approach easy to understand, structured approach which is divided into sections in order to study in shortest time possible.
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