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Exam 400-007 topic 1 question 197 discussion

Actual exam question from Cisco's 400-007
Question #: 197
Topic #: 1
[All 400-007 Questions]

Company XYZ is running BGP as their routing protocol. An external design consultant recommends that TCP path MTU discovery be enabled. Which effect will this have on the network?

  • A. It will create a loop free path
  • B. It will enhance the performance of TCP-based applications
  • C. It will improve the convergence time
  • D. It will increase the convergence time
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Suggested Answer: C 🗳️
by markmark1983 at Feb. 1, 2023, 9:25 p.m.

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Akkisingh
Highly Voted 2 years ago
Selected Answer: C
PMTUD doesn't really increase TCP performance but will improve convergence time coz fragmentation will be avoided
upvoted 5 times
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markmark1983
Highly Voted 2 years, 3 months ago
I will go for C - since it is asking for BGP
upvoted 5 times
biddid2
2 years, 1 month ago
Agree for C. Page 4 section 4.3 https://morse.colorado.edu/~epperson/courses/routing-protocols/handouts/improving_BGP_convergence.pdf
upvoted 4 times
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pizdecvsemu
2 years, 2 months ago
Also agree. TCP transport performance helps with re-convergence. Another option is turning ingress queue size.
upvoted 1 times
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schwabenschulle
2 years, 2 months ago
Agree https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp/configuration/15-sy/iap-15-sy-book/iap-tcp.html#GUID-E0CD16F9-E817-4B50-849A-4760E1C0A9B1 Use the ip tcp path-mtu-discovery global configuration command to enable Path MTU Discovery for connections initiated by the device when the device is acting as a host.
upvoted 1 times
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sandccie
Most Recent 2 months ago
Selected Answer: A
MTU mismatch cause BGP session to flap and cause loop. PMTUD can dynamically correct MTU. https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/116377-troubleshoot-bgp-mtu.html#toc-hId--1185936681
upvoted 1 times
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Devsin2000
2 months ago
Selected Answer: C
BGP operates over TCP, and it relies on TCP’s PMTUD to determine the largest packet size that can be sent without fragmentation. This will definitely improve convergence time. But if the TCP PMTUD is carried out from servers, the application performance can improve too.
upvoted 1 times
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kalulosu
3 months, 2 weeks ago
Selected Answer: B
I think ans is B BGP TCP path mtu discovery (PMTUD) can be used to prevent packet fragmentation that can degrade network performance.
upvoted 1 times
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noxkrugger
8 months, 1 week ago
Selected Answer: C
I can see C is the most correct one
upvoted 1 times
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gcpengineer
2 years, 2 months ago
Selected Answer: B
By discovering the path MTU, hosts can avoid sending packets that will be fragmented and instead use smaller packets that can be transmitted without fragmentation, leading to better performance.
upvoted 4 times
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ying162
2 years, 3 months ago
I vote for B. MTUD brings not much value to BGP default MTU.
upvoted 1 times
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C (25%)
B (20%)
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