As shown in the figure, network administrator A can control the path of traffic entering AS100 after modifying the MED value of the routing entries sent to R2 on the R1 router through the routing…

Question

Options

• ATRUE
• BFALSE

• A
  74% (23)
• B
  26% (8)

Explanation

Option A is correct because MED (Multi-Exit Discriminator) is a BGP attribute specifically designed to influence inbound traffic from a neighboring AS. When R1 advertises routes to R2 (in an adjacent AS), it can set different MED values on those advertisements - a lower MED value is preferred, so by assigning lower MEDs to routes advertised via one link versus another, AS100 effectively steers which entry point external traffic uses to enter AS100.

Option B (FALSE) is incorrect because MED is not merely a local preference attribute - it is propagated to eBGP peers precisely to give the originating AS a mechanism to signal preferred inbound paths to neighbors. This is a well-established traffic engineering technique in BGP policy.

Memory tip: Think of MED as a "welcome mat" you put at your front door - you control which door you place it at, telling visitors (neighboring ASes) which entrance you'd prefer they use. Lower MED = bigger welcome mat = preferred entry point.

No community discussion yet for this question.