Which LISP component enables a LISP site to communicate with a non-LISP site?
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Correct answer: Proxy ETR.
Why this is the answer
A Proxy ETR (PxETR) is a LISP component that allows LISP sites to communicate with non-LISP sites. When a non-LISP host sends a packet destined for a LISP EID (Endpoint Identifier), the PxETR acts as the default gateway for the non-LISP site. It encapsulates the packet and forwards it to the appropriate LISP RLOC (Routing Locator) for the destination EID. An ITR (Ingress Tunnel Router) is a LISP router that encapsulates packets from a LISP site destined for another LISP site. An ETR (Egress Tunnel Router) decapsulates packets arriving from the LISP infrastructure destined for a host within its LISP site. A Proxy ITR (PxITR) is used by LISP sites to communicate with non-LISP sites, but it handles traffic originating from a LISP site destined for a non-LISP site.
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