Which of the following routes is NOT considered an internal route?

Question

Options

• AA route received from a BGP peer within the same AS.
• BA route originated by a router in a different cluster of the same AS.
• CA route received from a BGP peer from a different member AS of a confederation.
• DA route received from a BGP peer from the same member AS of a confederation.

• A
  4% (1)
• B
  7% (2)
• C
  78% (21)
• D
  11% (3)

Explanation

Option C is the correct answer because routes exchanged between different member ASes within a BGP confederation use confederation eBGP - they cross sub-AS boundaries, carry confederation AS_PATH attributes, and behave like external routes, so they are not classified as internal routes in the traditional iBGP sense.

Why the distractors are wrong:

• A is clearly internal: a peer in the same AS communicates via iBGP by definition.
• B is internal: Route Reflector clusters are an intra-AS mechanism; routes between clusters still live entirely within one AS.
• D is internal: peers within the same confederation member AS use iBGP, making those routes internal just like any standard iBGP route.

Memory tip: Use the rule "same = internal." Same AS, same cluster, same confederation member AS → internal. The moment you cross into a different confederation member AS, you've crossed a sub-AS boundary (confederation eBGP), which breaks the "same" rule and makes the route non-internal. C is the only option that crosses that boundary.

No community discussion yet for this question.