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Cisco 400-007 Exam Syllabus Topics:

SectionObjectives
MPLS and VPN Architectures- VPN design
  • 1. L3VPN and L2VPN design models
    • 2. Multi-site connectivity strategies
      - MPLS fundamentals
      • 1. MPLS scalability design
        • 2. Label switching architecture
          Routing and Path Control- Routing protocol design
          • 1. OSPF / IS-IS architecture
            • 2. BGP policy and scalability
              - Traffic engineering
              • 1. Policy-based routing considerations
                • 2. Path optimization techniques
                  End-to-End Enterprise Architecture Scenarios- Large-scale enterprise design
                  • 1. High availability and redundancy
                    • 2. Scalability and resiliency trade-offs
                      - Service integration
                      • 1. Migration and transformation strategies
                        • 2. Hybrid connectivity design
                          Network Design Methodology and Principles- Requirements gathering and analysis
                          • 1. Stakeholder requirements mapping
                            • 2. Business and technical constraints
                              - Design lifecycle and methodology
                              • 1. Trade-off analysis techniques
                                • 2. Design phases and validation approaches
                                  Multicast and Advanced Services- Network services
                                  • 1. Security integration in design
                                    • 2. QoS design principles
                                      - Multicast design
                                      • 1. PIM architecture and scaling
                                        • 2. Multicast distribution models
                                          Infrastructure Design (Layer 2 / Layer 3)- Layer 2 technologies
                                          • 1. Ethernet scaling and segmentation
                                            • 2. Spanning Tree design considerations
                                              - Layer 3 design
                                              • 1. IGP selection and design
                                                • 2. IP addressing and summarization

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                                                  Cisco Certified Design Expert (CCDE) Written Exam Sample Questions (Q249-Q254):

                                                  NEW QUESTION # 249
                                                  Refer to the exhibit.

                                                  Company XYZ's BGP topology is as shown in the diagram. The interface on the LA router connected toward the 10.1.5.0/24 network is faulty and is going up and down, which affects the entire routing domain. Which routing technique can be used in the routing policy design so that the rest of the network is not affected by the flapping issue?

                                                  Answer: B

                                                  Explanation:
                                                  The issue described is classic route flapping, where a single unstable prefix (10.1.5.0/24) causes repeated route withdrawals and advertisements, triggering churn in the BGP control plane across the entire network.
                                                  This behavior can be mitigated using the following scalable and non-disruptive design approach:
                                                  * D. Route Aggregation: Aggregating routes at the edge router (in this case, the LA router) means that multiple more specific prefixes (such as 10.1.4.0/24 through 10.1.7.0/24) are advertised as a single summarized prefix (e.g., 10.1.4.0/22). As a result, the instability of 10.1.5.0/24 will not affect upstream routers (Chicago and New York), as they will only see the aggregated route.
                                                  Key benefits aligned with CCDE v3.1 design guidance:
                                                  * Isolates flapping to the edge while maintaining reachability
                                                  * Reduces control plane churn in BGP
                                                  * Preserves scalability and simplifies the routing table in upstream routers Why other options are incorrect:
                                                  * A (Route dampening): While effective, route dampening is less favored today due to convergence delay and side effects; it's also a reactive measure versus a design-based solution.
                                                  * B and C (Filtering): Filtering the route prevents reachability to that subnet, which violates availability requirements and causes data black-holing.
                                                  Thus, aggregation is the most scalable, nondisruptive, and design-aligned choice in this context.


                                                  NEW QUESTION # 250
                                                  Refer to the exhibit.

                                                  As part of a redesign project, you must predict multicast behavior What happens to the multicast traffic received on the shared tree (*,G), if it is received on the LHR interface indicated*?

                                                  Answer: B

                                                  Explanation:
                                                  https://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/16450-mcastguide0.html When a multicast packet arrives on an interface, the RPF process checks to ensure that this incoming interface is the outgoing interface used by unicast routing in order to reach the source of the multicast packet. This RPF check process prevents loops. Multicast routing does not forward a packet unless the source of the packet passes a RPF check. Once a packet passes this RPF check, multicast routing forwards the packet based only upon the destination address.


                                                  NEW QUESTION # 251
                                                  SDWAN networks capitalize the usage of broadband Internet links over traditional MPLS links to offer more cost benefits to enterprise customers. However, due to the insecure nature of the public Internet, it is mandatory to use encryption of traffic between any two SDWAN edge devices installed behind NAT gateways. Which overlay method can provide optimal transport over unreliable underlay networks that are behind NAT gateways?

                                                  Answer: A


                                                  NEW QUESTION # 252
                                                  A thorough examination of the curant network infrastructure has revealed that several devices have an unusual high CPU load A traffic analysis indicates that control plane protocols and management traffic are affected as the devices are busy processing inbound traffic The networking team is working on updating their design for the entre network to handle situations like this Which feature or technology can be added to help mitigate the problem?

                                                  Answer: D


                                                  NEW QUESTION # 253
                                                  Company XYZ has 30 sites using MPLS L3 VPN and the company is now concerned about data integrity. The company wants to redesign the security aspect of their network based on these requirements:
                                                  * Securely transfer the corporate data over the private WAN
                                                  * Use a centralized configuration model.
                                                  * Minimize overhead on the tunneled traffic.
                                                  Which technology can be used in the new design to meet the company's requirements?

                                                  Answer: A


                                                  NEW QUESTION # 254
                                                  ......

                                                  The Cisco 400-007 certification exam offers a great opportunity to advance your career. With the Cisco Certified Design Expert (CCDE) Written Exam certification exam beginners and experienced professionals can demonstrate their expertise and knowledge. After passing the Cisco Certified Design Expert (CCDE) Written Exam (400-007) exam you can stand out in a crowded job market. The Cisco Certified Design Expert (CCDE) Written Exam (400-007) certification exam shows that you have taken the time and effort to learn the necessary skills and have met the standards in the market.

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