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Exam 400-007 topic 1 question 65 discussion

Actual exam question from Cisco's 400-007
Question #: 65
Topic #: 1
[All 400-007 Questions]

Which relationship between iBGP and the underlying physical topology is true?

  • A. iBGP full mesh requires an underlying fully meshed network topology.
  • B. iBGP full mesh requirement does not dictate any specific network topology.
  • C. iBGP does not work on a ring network topology even with an underlying IGP.
  • D. iBGP can work only on a ring network topology with a link-state protocol like OSPF or IS-IS.
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Suggested Answer: B 🗳️
by toto11111 at Oct. 6, 2022, 8:30 a.m.

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qtg9rMGmj23tFm4n02X4
Highly Voted 2 years, 5 months ago
Selected Answer: B
correct, should be B. iBGP peers can be multiple hops away. not like eBGP that needs direct connection (or ebgp-multihop defined). thus, only IP connectivity between two peers is required for an adjacency to form. the logical topology can be full mesh, even if the underlying IP transport is not
upvoted 10 times
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The1BelowAll
Most Recent 4 months, 1 week ago
Selected Answer: B
iBGP require full mesh logical connection but it can use any physical topology.
upvoted 1 times
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anonymousch
10 months, 4 weeks ago
Selected Answer: A
Correct answer is A. With non ibgp routers in the middle of a topology, these routers don't have routing information. Next-hop info is not an overlay.
upvoted 2 times
JCGO
6 months, 3 weeks ago
Yeah, but full mesh is when every router has iBGP session with every other. there will be no "non ibgp routers"
upvoted 1 times
JCGO
6 months, 3 weeks ago
I would choose A (full mesh connectivity) in case of no iGP at all.
upvoted 1 times
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Gozzimer
1 year, 10 months ago
I think the "specific network topology" may be the meaning about "AS". iBGP require the topology on the same AS.
upvoted 1 times
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Akkisingh
1 year, 12 months ago
Selected Answer: B
iBGP full mesh topology only needed, if we don't want to run any IGP. So, correct ans should be B
upvoted 1 times
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Dvnn
2 years, 1 month ago
Selected Answer: B
B, iBGP does not dictate physical topology
upvoted 1 times
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toto11111
2 years, 6 months ago
Selected Answer: B
It should be B. iBGP do not require any thing about physical topology. any feedback ?
upvoted 2 times
ying162
2 years, 5 months ago
you are correct. MPLS would be a good example
upvoted 1 times
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C (25%)
B (20%)
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