Exam 300-510 topic 1 question 153 discussion

Actual exam question from Cisco's 300-510

Question #: 153
Topic #: 1

Refer to the exhibit. While troubleshooting a networking issue, an engineer identified a suboptimal communication issue on route reflector RR2. In the current environment:
• Router A is a non-route-reflector client for RR1 and RR2.
• Routers D and E are directly connected iBGP peers.
• Router F is not an iBGP peer of routers D and E.

Which action resolves the issue?

A. Remove the route-reflector configuration on router RR2.
B. Disable BGP client-to-client reflection on router RR2.
C. Enable next-hop-self for BGP peering on router D.
D. Enable next-hop-self for BGP peering on router C.

Show Suggested Answer

Suggested Answer: D 🗳️

by DUsoo at Nov. 16, 2023, 7:10 a.m.

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elguije

6 months, 3 weeks ago

Selected Answer: B

I think the keys to this question are in: - Routers D and E are directly connected iBGP peers. - Router F is not an iBGP peer of routers D and E. If BGP client-to-client reflection is disabled, routers D and E will continue to exchange information since they are directly connected. Router F is not, but it is not and iBGP peer to D and E. There is a circle there, but it doesn't say it is the same AS. I think B is the best option here.

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snowbow

1 year, 1 month ago

Selected Answer: D

Not the best written question but the fact that Router C is a gateway to an eBGP peer means it should use next-hop-self for all the iBGP routers so I pick answer D

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snowbow

1 year, 1 month ago

Looking closer, 10.10.10.1 is not an eBGP peer, and next-hop-self doesn't apply to reflected routes so Im not sure of an answer here

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thejag

1 year, 6 months ago

This document explains router reflectors nicely https://www.ciscolive.com/c/dam/r/ciscolive/emea/docs/2020/pdf/R6BGArNQ/TECRST-1310.pdf#xd_co_f=MDkyZDAyMmUtN2RlMS00ZjIzLTk2ZDMtNzMwN2FkZTMyMzQx~

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DUsoo

1 year, 7 months ago

Is here any correct answer??? A) Remove the route-reflector configuration on router RR2 - no, we do not have full-mesh B) Disable BGP client-to-client reflection - we do not have full-mesh C) Enable next-hop-self for BGP peering on router D - next-hop is changed only if the route is received from eBGP D) Enable next-hop-self for BGP peering on router C. - next-hop-self command on the route reflector will modify next hop attributes only for routes that are learned from eBGP peers

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thejag

1 year, 6 months ago

No DUsoo, I also don't see any correct answer to this.

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