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Cisco 400-007 Exam Syllabus Topics:

SectionObjectives
Topic 1: MPLS and VPN Architectures- MPLS fundamentals
  • 1. Label switching architecture
    • 2. MPLS scalability design
      - VPN design
      • 1. Multi-site connectivity strategies
        • 2. L3VPN and L2VPN design models
          Topic 2: Infrastructure Design (Layer 2 / Layer 3)- Layer 3 design
          • 1. IP addressing and summarization
            • 2. IGP selection and design
              - Layer 2 technologies
              • 1. Spanning Tree design considerations
                • 2. Ethernet scaling and segmentation
                  Topic 3: Network Design Methodology and Principles- Design lifecycle and methodology
                  • 1. Trade-off analysis techniques
                    • 2. Design phases and validation approaches
                      - Requirements gathering and analysis
                      • 1. Stakeholder requirements mapping
                        • 2. Business and technical constraints
                          Topic 4: Routing and Path Control- Routing protocol design
                          • 1. BGP policy and scalability
                            • 2. OSPF / IS-IS architecture
                              - Traffic engineering
                              • 1. Path optimization techniques
                                • 2. Policy-based routing considerations
                                  Topic 5: Multicast and Advanced Services- Network services
                                  • 1. Security integration in design
                                    • 2. QoS design principles
                                      - Multicast design
                                      • 1. Multicast distribution models
                                        • 2. PIM architecture and scaling
                                          Topic 6: End-to-End Enterprise Architecture Scenarios- Large-scale enterprise design
                                          • 1. High availability and redundancy
                                            • 2. Scalability and resiliency trade-offs
                                              - Service integration
                                              • 1. Hybrid connectivity design
                                                • 2. Migration and transformation strategies

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                                                  Cisco Certified Design Expert (CCDE) Written Exam Sample Questions (Q191-Q196):

                                                  NEW QUESTION # 191
                                                  Refer to the exhibit. A customer network design team is planning a migration from a legacy TDM- based L2VPN to an MPLS-based L3VPN. Migration is planned in a phased approach:
                                                  - OSPF backbone Link between HUB A and HUB B sites to be migrated to
                                                  eBGP.
                                                  - Spoke A2 and Spoke B1 will be migrated to the L3VPN.
                                                  Which solution design can be considered to avoid routing loops during backbone link migration?

                                                  Answer: A

                                                  Explanation:
                                                  Filtering spoke prefixes on the temporary OSPF backbone between HUB A and HUB B prevents those routes from circulating simultaneously via OSPF and the new eBGP/L3VPN path, removing dual-path feedback and avoiding routing loops during the phased migration.


                                                  NEW QUESTION # 192
                                                  With virtualization being applied in many parts of the network every physical link is likely to carry one or more virtual links, but what is a drawback in cases like this?

                                                  Answer: D


                                                  NEW QUESTION # 193
                                                  Company XYZ asks for design recommendations for Layer 2 redundancy. The company wants to prioritize fast convergence and resiliency elements. In the design. Which two technologies are recommended? (Choose two.)

                                                  Answer: D,E


                                                  NEW QUESTION # 194
                                                  An architect prepares a network design for a startup company. The design must be able to meet business requirements while the business grows and divests due to rapidly changing markets. What is the highest priority in this design?

                                                  Answer: D


                                                  NEW QUESTION # 195
                                                  Which two mechanisms avoid suboptimal routing in a network with dynamic mutual redistribution between multiple OSPFv2 and EIGRP boundaries? (Choose two.)

                                                  Answer: C,E

                                                  Explanation:
                                                  Mutual redistribution between different routing protocols can cause routing loops and suboptimal routing due to:
                                                  Route feedback loops (routes being re-imported back into the originating protocol).
                                                  Inconsistent administrative distances (AD) leading to selection of suboptimal paths.
                                                  Two key mechanisms avoid these issues:
                                                  A). Administrative Distance (AD) manipulation: Ensures that one protocol is consistently preferred over the other when duplicate routes exist.
                                                  C). Route tagging: Assigns tags to redistributed routes to identify the source of the route and prevent re- importation (looping) into the originating protocol.
                                                  These methods align with CCDE v3.1 principles for multi-protocol control plane design and stability.
                                                  Why other options are incorrect:
                                                  B and F: Matching routes or process IDs do not directly prevent loops or suboptimal routing.
                                                  D is a duplicate of C.
                                                  E: Filtering helps but is reactive, not a comprehensive prevention mechanism.
                                                  -


                                                  NEW QUESTION # 196
                                                  ......

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