Which LISP infrastructure device provides connectivity between non-LISP sites and LISP sites by receiving non-LISP traffic with a LISP site destination?

Question

Options

• APETR
• BPITR
• Cmap resolver
• Dmap server

• A
  4% (1)
• B
  88% (23)
• C
  8% (2)

Explanation

LISP PITR Explanation

A Proxy Ingress Tunnel Router (PITR) is the correct answer because it specifically handles traffic from non-LISP sites destined for LISP sites. The PITR advertises default or aggregate routes into the non-LISP internet, attracting traffic from non-LISP sources, then encapsulates and forwards that traffic into the LISP domain on behalf of the non-LISP sender.

Why the distractors are wrong:

• PETR (Proxy Egress Tunnel Router) does the opposite - it handles traffic from LISP sites destined for non-LISP sites
• Map Resolver is a LISP control-plane device that receives and processes Map-Request messages from ITRs to resolve EID-to-RLOC mappings
• Map Server is also a control-plane device that accepts Map-Register messages from ETRs and maintains the mapping database

Memory Tip: Think of it this way - Ingress = traffic coming IN to the LISP network from the outside (non-LISP). The PITR handles the Proxy function at the Ingress point for non-LISP-sourced traffic. If you remember "PITR = Path Into The LISP Region," you'll never confuse it with the PETR again.

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