Exam 350-501 topic 1 question 372 discussion

Actual exam question from Cisco's 350-501

Question #: 372
Topic #: 1

Refer to the exhibit. Tier 1 ISP A is connected to small Tier 3 ISP B. The EBGP routing protocol is used for route exchange. The networking team at ISP A noticed the flapping of BGP sessions with ISP B. The team decides to improve stability on the network by suppressing the subnet for 30 minutes when a session begins to flap. Which action must the team perform to meet this goal?

A. Implement BGP route dampening on ISP A router R1 with the bgp dampening 15 700 1500 30 command.
B. Implement a BGP route withdraw-delay timer on ISP B router R3 with the bgp withdraw-delay 30 15 90 30 command.
C. Implement a BGP route-penalty timer on ISP A router R1 with the bgp penalty-timer 30 250 750 15 command.
D. Implement BGP route suppression on ISP A router R2 with the bgp suppression 30 600 1200 30 command.

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Suggested Answer: A 🗳️

by Abbribas at Sept. 11, 2024, 12:07 a.m.

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Abbribas

8 months, 3 weeks ago

Selected Answer: A

Answer : A > BGP route dampening is used to suppress unstable (flapping) routes. In this case, the command bgp dampening 15 700 1500 30 sets the following parameters: 15: Half-life (time in minutes before penalties are reduced by half). 700: Suppress penalty threshold. Once this threshold is exceeded, the route is suppressed. 1500: Reuse penalty threshold. When the route's penalty falls below this value, it is reused (unsuppressed). 30: Maximum duration (in minutes) for which the route is suppressed. This configuration meets the requirement of suppressing a route for 30 minutes if flapping occurs.

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