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Cisco 400-007 Certification Exam is an essential step for IT professionals who want to enhance their skills and knowledge in network design. It is a challenging exam that requires a deep understanding of network design principles, methodologies, and best practices. Passing the exam and earning the CCDE certification is a significant achievement that can open up new career opportunities and help IT professionals stand out in a competitive job market.

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Cisco 400-007, also known as the Cisco Certified Design Expert (CCDE v3.0) Written Exam, is a professional-level certification exam that measures a candidate's expertise in network design principles and methodologies. 400-007 Exam is designed for experienced network architects, engineers, and designers who are involved in the planning, design, implementation, and maintenance of complex enterprise networks.

Cisco Certified Design Expert (CCDE) Written Exam Sample Questions (Q251-Q256):

NEW QUESTION # 251
Drag and drop the characteristics from the left onto the corresponding network management options on the right.

Answer:

Explanation:


NEW QUESTION # 252
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: D

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 # 253
Which two descriptions of CWDM are true? (Choose two)

Answer: B,C


NEW QUESTION # 254
Which aspect of BGP-LS makes it scalable in large network when multiarea topology information must be gathered?

Answer: D


NEW QUESTION # 255
What is a web-based model in which a third-party provider hosts applications that are available to customers over the Internet?

Answer: A


NEW QUESTION # 256
......

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