Locator/ID Separation Protocol (LISP) is a network architecture and set of protocols that implements a new semantic for IP addressing. LISP supports several components that enable this separation of identity and location, including: * Proxy Egress Tunnel Router (Proxy ETR): This component helps in routing traffic for endpoints that are not registered with LISP, acting as an intermediary. * HMAC Algorithm: HMAC (Hash-based Message Authentication Code) is used in LISP for security purposes, ensuring data integrity and authentication of the message source. References: The Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR)