300-320 Question #313: Real Exam Question with Answer & Explanation

The correct answer is A: Multi-exit discriminator (MED). To influence how a remote AS sends traffic INTO your AS (inbound traffic), you must set attributes on routes you ADVERTISE outbound that the remote AS will then evaluate. MED (Multi-Exit Discriminator) is sent to a neighboring AS to suggest a preferred entry point when multiple l

Question

Which two BGP attributes can be set with outbound policy to manipulate inbound traffic, if honored by the remote Autonomous system? (Choose two)

Options

AMulti-exit discriminator (MED)
BAS path
CLocal Preference
DWeight

Explanation

To influence how a remote AS sends traffic INTO your AS (inbound traffic), you must set attributes on routes you ADVERTISE outbound that the remote AS will then evaluate. MED (Multi-Exit Discriminator) is sent to a neighboring AS to suggest a preferred entry point when multiple links exist between the two ASes - a lower MED is preferred. AS Path prepending artificially lengthens your AS path in outbound advertisements, making that path appear less attractive to the remote AS and steering inbound traffic to a different link. Local Preference (choice C) is used to influence outbound traffic within a single AS and is not exchanged between ASes (it is non-transitive). Weight (choice D) is Cisco-proprietary, local to a single router, and never advertised to any peer - it only affects outbound path selection on that one router.

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