Which LISP component is required for a LISP site to communicate with a non-LISP site?

A. ETR
B. ITR
C. Proxy ETR
D. Proxy ITR

Which LISP component is required for a LISP site to communicate with a non-LISP site?

A. ETR
B. ITR
C. Proxy ETR
D. Proxy ITR

Correct Answer: C

• ITR (Ingress tunnel router) – receives the packet from local site and encapsulates them to the remote LISP site or natively forwards the packet to a non LISP sites.
• ETR (Egress tunnel router) – receives packet from the core network and de-encapsulates the packet and sends it to site.
• PITR (Proxy ingress tunnel router) – receives packet from non LISP sites and encapsulates the packet to LISP sites or forward them natively.
• PETR (Proxy egress tunnel router) – de-encapsulates packets from LISP sites to deliver them to non LISP sites
• MS (Map server) – is a mapping database which is accepting registration requests from its client egress tunnel routers (ETRs)
• MR (Map resolver) – The function of the LISP MR is to accept encapsulated Map-Request messages from ingress tunnel routers (ITRs), decapsulate those messages, and then forward the messages to the MS responsible for the egress tunnel routers (ETRs) that are authoritative for the requested EIDs.