The Local_Preference attribute is used to determine the best route for traffic leaving the AS. When multiple routes with the same destination address but different next hops are obtained through…

Question

Options

• ATRUE
• BFALSE

• A
  76% (34)
• B
  24% (11)

Explanation

LOCAL_PREF is a well-known discretionary BGP attribute used specifically to influence outbound traffic from within an Autonomous System (AS) - when your AS has multiple exit points to the same destination, the IBGP peer advertising the highest LOCAL_PREF value wins. This makes option A correct: the statement accurately captures both the purpose (best exit route selection) and the behavior (higher value = preferred). Option B is wrong because it contradicts the RFC 4271 specification - LOCAL_PREF is explicitly designed for exactly this tie-breaking role among IBGP routes to the same destination prefix.

Memory tip: Think "LOCAL = LEAVE - LOCAL_PREF controls how traffic leaves locally (your AS), and larger = better." Contrast with MED (Multi-Exit Discriminator), which influences inbound traffic from a neighboring AS and where lower values are preferred - the two attributes are mirror opposites in both direction and value preference.

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