Exam 400-007 topic 1 question 275 discussion

Actual exam question from Cisco's 400-007

Question #: 275
Topic #: 1

Your company implemented LFA in the network to help with fast convergence in case a failure occurs on the network. However, while the network is being tested to confirm that LFA is working properly, the test set starts receiving "TTL expired in transit" messages for a limited amount of time. What is the cause of these messages?

A. recursion
B. flooding of packets
C. microloops
D. interface dampening

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Suggested Answer: C 🗳️

by Doobiedoo at Aug. 19, 2024, 9:49 p.m.

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Doobiedoo

9 months, 3 weeks ago

Selected Answer: C

C. microloops Here's why: * Microloops: These are small, unintended loops in the network that can cause packets to be forwarded in circles, consuming their TTL (Time to Live) and eventually being dropped. * LFA and microloops: LFA, while designed to improve convergence, can inadvertently create microloops if not configured or implemented correctly. * Testing and microloops: During testing, it's common to encounter temporary configurations or scenarios that can lead to microloops. While recursion, flooding of packets, and interface dampening can also cause network issues, microloops are the most likely explanation for the specific symptom of "TTL expired in transit" messages appearing during testing of LFA. To resolve the issue, you'll need to carefully examine the network topology, LFA configuration, and any recent changes to identify and eliminate the microloop.

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