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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 361

Which two design solutions ensure sub-50 msec of the convergence time after a link failure in the network?
(Choose two)

Correct Answer: B,D
To achieve sub-50 millisecond convergence after a link or node failure, the design must rely on precomputed protection paths and local repair mechanisms in the data plane. The following mechanisms meet this requirement:
* B. Ti-LFA (Topology Independent Loop-Free Alternate): A next-generation fast reroute method used in Segment Routing. It offers local protection by computing loop-free backup paths that are independent of the specific failure type (node or link). It's capable of sub-50 ms convergence by rerouting traffic immediately on failure.
* D. MPLS-FRR (Fast Reroute): A traditional mechanism in MPLS networks that provides pre-signaled backup Label Switched Paths (LSPs). It enables fast switchover upon failure detection-also under 50 ms.
Other options:
* A. BFD: Provides fast failure detection, but does not provide the actual traffic reroute mechanism.
* C. Minimal BGP scan time: Impacts control plane responsiveness but not sub-50 ms convergence.
* E. IGP fast hello: Improves failure detection but alone doesn't guarantee traffic reroute under 50 ms.
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Question 362

Which design solution reduces the amount of IGMP state in the network?

Correct Answer: A
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Question 363

While reviewing an existing network design, you are discussing the characteristics of different STP versions.
Which protocol minimizes unicast flooding during a Topology Change Notification in a Layer 2 switched network with many VLANs?

Correct Answer: B
* B (MST - Multiple Spanning Tree): Bundles multiple VLANs into fewer STP instances, minimizing the scope of TCN propagation, which helps reduce MAC table flushing and unicast flooding.
Why other options are incorrect:
* A: PVRSTP still processes TCNs per VLAN, increasing flooding.
* C: Legacy STP behaves similarly but is not optimized for multiple VLANs.
* D: PVSTP+ generates TCNs per VLAN like PVRSTP.
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Question 364

Company XYZ has 30 sites running a legacy private WAN architecture that connects to the Internet via multiple high- speed connections The company is now redesigning their network and must comply with these design requirements :
* Use a private WAN strategy that allows the sites to connect to each other directly and caters for future expansion.
* Use the Internet as the underlay for the private WAN.
* Securely transfer the corporate data over the private WAN.
Which two technologies should be Incorporated into the design of this network? (Choose two.)

Correct Answer: D,E
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Question 365

How can EIGRP topologies be designed to converge as fast as possible in the event of a point-to-point link failure?

Correct Answer: B
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