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Exam 350-401 topic 1 question 128 discussion

Actual exam question from Cisco's 350-401
Question #: 128
Topic #: 1
[All 350-401 Questions]

Refer to the exhibit.

Which configuration establishes EBGP neighborship between these two directly connected neighbors and exchanges the loopback network of the two routers through BGP?

  • A. R1(config)#router bgp 1 R1(config-router)#neighbor 192.168.10.2 remote-as 2 R1(config-router)#network 10.1.1.0 mask 255.255.255.0 R2(config)#router bgp 2 R2(config-router)#neighbor 192.168.10.1 remote-as 1 R2(config-router)#network 10.2.2.0 mask 255.255.255.0
  • B. R1(config)#router bgp 1 R1(config-router)#neighbor 10.2.2.2 remote-as 2 R1(config-router)#network 10.1.1.0 mask 255.255.255.0 R2(config)#router bgp 2 R2(config-router)#neighbor 10.1.1.1 remote-as 1 R2(config-router)#network 10.2.2.0 mask 255.255.255.0
  • C. R1(config)#router bgp 1 R1(config-router)#neighbor 192.168.10.2 remote-as 2 R1(config-router)#network 10.0.0.0 mask 255.0.0.0 R2(config)#router bgp 2 R2(config-router)#neighbor 192.168.10.1 remote-as 1 R2(config-router)#network 10.0.0.0 mask 255.0.0.0
  • D. R1(config)#router bgp 1 R1(config-router)#neighbor 10.2.2.2 remote-as 2 R1(config-router)#neighbor 10.2.2.2 update-source lo0 R1(config-router)#network 10.1.1.0 mask 255.255.255.0 R2(config)#router bgp 2 R2(config-router)#neighbor 10.1.1.1 remote-as 1 R2(config-router)#neighbor 10.1.1.1 update-source lo0 R2(config-router)#network 10.2.2.0 mask 255.255.255.0
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Suggested Answer: A 🗳️
by nep1019 at June 30, 2020, 1:36 a.m.

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xziomal9
Highly Voted 3 years, 10 months ago
A. R1(config)#router bgp 1 R1(config-router)#neighbor 192.168.10.2 remote-as 2 R1(config-router)#network 10.1.1.0 mask 255.255.255.0 R2(config)#router bgp 2 R2(config-router)#neighbor 192.168.10.1 remote-as 1 R2(config-router)#network 10.2.2.0 mask 255.255.255.0 B. R1(config)#router bgp 1 R1(config-router)#neighbor 10.2.2.2 remote-as 2 R1(config-router)#network 10.1.1.0 mask 255.255.255.0 R2(config)#router bgp 2 R2(config-router)#neighbor 10.1.1.1 remote-as 1 R2(config-router)#network 10.2.2.0 mask 255.255.255.0 C. R1(config)#router bgp 1 R1(config-router)#neighbor 192.168.10.2 remote-as 2 R1(config-router)#network 10.0.0.0 mask 255.0.0.0 R2(config)#router bgp 2 R2(config-router)#neighbor 192.168.10.1 remote-as 1 R2(config-router)#network 10.0.0.0 mask 255.0.0.0 D. R1(config)#router bgp 1 R1(config-router)#neighbor 10.2.2.2 remote-as 2 R1(config-router)#neighbor 10.2.2.2 update-source lo0 R1(config-router)#network 10.1.1.0 mask 255.255.255.0 R2(config)#router bgp 2 R2(config-router)#neighbor 10.1.1.1 remote-as 1 R2(config-router)#neighbor 10.1.1.1 update-source lo0 R2(config-router)#network 10.2.2.0 mask 255.255.255.0 The correct answer is: A
upvoted 25 times
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maurom
Highly Voted 5 years, 1 month ago
A is the correct because we are dont use igp
upvoted 14 times
diegodavid82
3 years, 10 months ago
Well, to establish an EBGP neighbor you don't need an IGP. Answer A is correct because is the right configuration.
upvoted 3 times
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AbdullahMohammad251
Most Recent 12 months ago
Selected Answer: A
The `neighbor <IP address> ebgp-multihop 2` command is needed to allow the BGP session to extend beyond a single hop. This command is used when you want to reach an external BGP peer that is not directly connected or is using an interface on a different subnet.
upvoted 2 times
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techriese
2 years, 1 month ago
Selected Answer: A
A is correct
upvoted 1 times
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bora4motion
2 years, 8 months ago
Selected Answer: A
A is correct.
upvoted 1 times
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Pudu_vlad
2 years, 11 months ago
A is the correct
upvoted 1 times
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Dataset
3 years ago
A is correct
upvoted 1 times
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brightsyds
3 years, 6 months ago
A for sure!
upvoted 1 times
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pj_machado
4 years ago
D is not correct because it does not have the bgp multi-hop configuration command
upvoted 1 times
ArchBishop
3 years, 6 months ago
The routers are essentially directly connected, so they are not required to have 'multi-hop' configured. For D to be the correct answer, each router would need to have a valid entry in their RIB to reach the destination neighbor's loopback network (more specifically, the neighbors loopback interface). This, at a minimum, could be accomplished with a static route on each router to their neighbor's loopback network, whether a /32 to the interface, or a /24 that covers the entire subnet. Otherwise, the router will HAVE the neighbor entry, but have no clue how to reach the remote IP.
upvoted 2 times
ArchBishop
3 years, 6 months ago
I am wrong about 'multi-hop.' eBGP ttl default is 1 hop before discard occurs. When using loopback as a source, the hop from the loop network to the exit interface's network counts as 1 hop, meaning discard will occur. Multi-hop, update-source, AND valid route, are all required in order to use loopbacks in a neighbor statement.
upvoted 2 times
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patrickni
4 years, 11 months ago
chalosca is correct. Answer is A.
upvoted 1 times
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akbntc
4 years, 11 months ago
Question has clearly asked "Which configuration establishes EBGP neighborship between these two directly connected neighbors", so option A is correct.
upvoted 1 times
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nead
5 years ago
A is correct. D is close but there is no information of the Loopback addresses, so they cannot be used in the neighbor statement
upvoted 1 times
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Jack1188
5 years ago
The answer is A
upvoted 3 times
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imed
5 years, 1 month ago
answer D is correct
upvoted 1 times
bluemoon0817
5 years ago
No, D is IBGP's configuration.
upvoted 1 times
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nep1019
5 years, 1 month ago
Answer is D. In order to exchange the Loopback addresses you must have the update-source statement added to the neighbor statement.
upvoted 2 times
bluemoon0817
5 years ago
D is IBGP's configuration.
upvoted 1 times
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chalosca
5 years ago
This would require "ebgp-multihop 2" Answer is A
upvoted 6 times
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AleGll
4 years, 7 months ago
A is the correct one. D is another right way to configure BGP peers ( using loopback addresses ), but it's not the requested mode.
upvoted 1 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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