Cisco Enterprise Network Core Technologies (ENCOR) Practice Exam

The Proxy Ingress Tunnel Router (PITR) serves the purpose of performing mapping lookups for non-LISP-capable sites. In the context of LISP (Locator/Identifier Separation Protocol), the PITR is essential when dealing with traffic originating from or destined for endpoints that do not support the LISP protocol. Since these non-LISP-capable sites cannot directly use the LISP architecture for routing, the PITR provides a crucial service by facilitating the mapping between endpoint identifiers (EIDs) and routing locators (RLOCs) for these sites.

This functionality allows the LISP-enabled network to communicate seamlessly with endpoints that are not configured to understand the LISP mappings, ensuring that the necessary translations and lookups occur to forward traffic correctly. By handling these mapping lookups, the PITR effectively bridges the gap between LISP-enabled sites and non-LISP sites, allowing for smoother interoperability in a hybrid networking environment.