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  1. Home
  2. Cisco Certification
  3. 400-007 Exam
  4. Cisco.400-007.v2025-12-06.q401 Dumps
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Question 251

Which statement about hot-potato routing architecture design is true?

Correct Answer: C
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Question 252

A network engineering team is in the process of designing a lab network for a customer demonstration. The design engineer wants to show that the resiliency of the MPLS Traffic Engineering Fast Reroute solution has the same failover/failback times as a traditional SONET/SDH network (around 50 msec). In order to address both link failure and node failure within the lab topology network, which type of the MPLS TE tunnels must be considered for this demonstration?

Correct Answer: D
To achieve sub-50ms protection against both link and node failures, MPLS TE Fast Reroute (FRR) with Next- Next-Hop (NNHop) protection is used:
* Next-Next-Hop tunnels provide node protection by pre-establishing a detour that bypasses not only the immediate next-hop link but also the entire next node.
* This ensures protection for both link and node failures, matching SONET/SDH resiliency targets.
Other options explained:
* A & C: TE backup and FRR backup tunnels may only provide link protection depending on deployment.
* B: Next-Hop tunnels address only link failures, not node failures.
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Question 253

In an OSPF network with routers connected together with Ethernet cabling, which topology typically takes the longest to converge?

Correct Answer: E
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Question 254

Refer to the exhibit.

Company XYZ 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 the network administrator use so that the rest of the network is not affected by the flapping issue?

Correct Answer: B
* B (Route dampening): Route dampening suppresses the advertisement of flapping routes in BGP to protect the stability of the routing domain. Once the penalty threshold is reached, the unstable route is suppressed temporarily, preventing frequent updates from impacting the rest of the BGP network.
Other options explained:
* A: Aggregation may help, but if the summary includes unstable subnets, flapping may still affect the summary.
* C/D: Filtering removes the route entirely, which may be undesirable if occasional reachability is still needed.
-
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Question 255

Your company wants to deploy a new data center infrastructure. Based on the requirements you have chosen VXLAN as encapsulation technology. The customer is concerned about misconfiguration of Layer 2 devices and DC-wide outages caused by Layer 2 loops. What do you answer?

Correct Answer: A
* A (VXLAN offers native loop avoidance): VXLAN uses Layer 3 underlay with encapsulation, inherently avoiding Layer 2 loops common in traditional Layer 2 fabrics.
Why other options are incorrect:
* B: Storm control mitigates broadcast storms but doesn't prevent loops.
* C: vPC+ helps but doesn't replace VXLAN's loop-free architecture.
* D: BPDU Guard helps protect edge ports, but loop prevention in VXLAN is primarily handled by its Layer 3 foundation.
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