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).
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
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
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