Nokia Certified Network Associate – IP/MPLS Services — Question 10

An export policy is applied on a router to advertise a prefix to its eBGP peers. By default, which of the following updates are made to the route attributes?

Answer options

• A. LOCAL_PREFERENCE is set to 100.
• B. NEXT_HOP is set to the neighbor router's interface IP address.
• C. The local AS number is added to AS_PATH.
• D. COMMUNITY is set to the local AS number.

Correct answer: C

Explanation

The correct answer is C because when a prefix is advertised to eBGP peers, the local AS number is indeed added to the AS_PATH attribute. Option A is incorrect as LOCAL_PREFERENCE is not relevant in eBGP updates; it is set in iBGP. Option B is misleading since NEXT_HOP is only set to the IP address of the advertising router. Option D is wrong because COMMUNITY does not default to the local AS number.