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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 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
                  Topic 3: End-to-End Enterprise Architecture Scenarios- Service integration
                  • 1. Migration and transformation strategies
                    • 2. Hybrid connectivity design
                      - Large-scale enterprise design
                      • 1. Scalability and resiliency trade-offs
                        • 2. High availability and redundancy
                          Topic 4: Network Design Methodology and Principles- Requirements gathering and analysis
                          • 1. Business and technical constraints
                            • 2. Stakeholder requirements mapping
                              - Design lifecycle and methodology
                              • 1. Trade-off analysis techniques
                                • 2. Design phases and validation approaches
                                  Topic 5: Routing and Path Control- Routing protocol design
                                  • 1. BGP policy and scalability
                                    • 2. OSPF / IS-IS architecture
                                      - Traffic engineering
                                      • 1. Policy-based routing considerations
                                        • 2. Path optimization techniques
                                          Topic 6: 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

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                                                  400-007トレーリング学習 & 400-007復習内容

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                                                  Cisco Certified Design Expert (CCDE) Written Exam 認定 400-007 試験問題 (Q93-Q98):

                                                  質問 # 93
                                                  An IT services company offers cloud services to a banking customer. The banking customer has raised a ticket about unauthorized access and data loss. They use an authentication token on a mobile phone for authenticating access to the cloud platform from their local applications. The security response team has determined that the attacker used a phishing scheme in an effort to replace the token allowing them to direct the banking data to which policy change can help prevent identical situations in the future ?

                                                  正解：C


                                                  質問 # 94

                                                  Refer to the exhibit: A customer is migrating from a TDM-based Layer 2 VPN (L2VPN) to an MPLS Layer 3 VPN (L3VPN) in phases. The backbone OSPF connection between HUB A and HUB B will be replaced by eBGP. During the migration, some spokes (A2 and B1) are already moved to the L3VPN. The goal is to avoid routing loops during this hybrid transition.
                                                  Which design choice helps prevent routing loops during the backbone link migration?

                                                  正解：B

                                                  解説：
                                                  # Comprehensive Explanation:
                                                  A: In hybrid WAN designs where routing domains are gradually migrating from OSPF to BGP, particularly with overlapping domains or redistribution points, loops can occur if the same routes are seen via multiple protocols (e.g., BGP and OSPF). Implementing route filtering on the OSPF backbone prevents it from learning and advertising spoke routes that it also receives via BGP-eliminating the loop scenario.
                                                  B: Advertising a low administrative distance (AD) for transit traffic does not prevent loops and may worsen convergence or cause routing inconsistency.
                                                  C: Summarizing OSPF routes may reduce the routing table size, but it does not solve the loop issue caused by dual protocol redistribution unless filtering is applied.
                                                  D: Redistributing EIGRP routes into BGP with a low cost might cause preference toward one path but does not address the loop risk between the hybrid segments (OSPF and BGP).
                                                  This is a classic use case for route filtering in dual-protocol or dual-backbone migrations, where ensuring consistent path selection and loop prevention is essential.
                                                  #


                                                  質問 # 95
                                                  Which design principal improves network resiliency?

                                                  正解：A


                                                  質問 # 96
                                                  You are tasked with the design of a high available network. Which two features provide fail closed environments? (Choose two.)

                                                  正解：C、D

                                                  解説：
                                                  * B (RPVST+ - Rapid Per VLAN Spanning Tree Plus): Provides fast convergence while blocking redundant paths to prevent loops - fail closed behavior under failure scenarios.
                                                  * C (MST - Multiple Spanning Tree): Provides loop prevention and isolates failures to specific instances (VLANs), maintaining fail closed protection.
                                                  Why other options are incorrect:
                                                  * A: EIGRP is a routing protocol; does not operate at Layer 2 to provide fail-closed loop protection.
                                                  * D: L2MP (Layer 2 Multipathing) allows multiple active links but requires additional loop prevention mechanisms.
                                                  -


                                                  質問 # 97
                                                  Company XYZ wants to improve the security design of their network to include protection from reconnaissance and DoS attacks on their sub interfaces destined toward next hop routers. Which technology can be used to prevent these types of attacks?

                                                  正解：B


                                                  質問 # 98
                                                  ......

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