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Exam 4A0-102 topic 1 question 31 discussion

Actual exam question from Alcatel-Lucent's 4A0-102

Question #: 31
Topic #: 1

[All 4A0-102 Questions]

Click the exhibit.

Router R1 is advertising prefix 192.168.1.0/27 with community "no-export. Which routers will receive an update for that prefix?

A. Router R2 only.
B. Routers R2 and R3 only.
C. Routers R2, R3 and R4 only.
D. Routers R2, R3, R4and R5.

Show Suggested Answer

Suggested Answer: D 🗳️

by IgorMS79 at May 20, 2020, 7:03 p.m.

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MariuszSRA335

1 month, 4 weeks ago

Correct answer is C From RFC 1997: NO_EXPORT (0xFFFFFF01) All routes received carrying a communities attribute containing this value MUST NOT be advertised outside a BGP confederation boundary (a stand-alone autonomous system that is not part of a confederation should be considered a confederation itself).

upvoted 1 times

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AmrMamdouh

1 year ago

Correct Answer: C

upvoted 1 times

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ablongo

2 years, 9 months ago

Here are the 4 well known BGP communities: Internet: advertise the prefix to all BGP neighbors. No-Advertise: don’t advertise the prefix to any BGP neighbors. No-Export: don’t advertise the prefix to any eBGP neighbors. Local-AS: don’t advertise the prefix outside of the sub-AS (this one is used for BGP confederations). Correct Answer: C

upvoted 2 times

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ducpham

3 years, 7 months ago

no-export — All received routes that contain this community value must not be advertised outside a BGP confederation boundary (a nonconfederated AS is considered a single AS confederation). Correct answer is C

upvoted 4 times