Cisco ENCOR Practice Exam 2025 – All-in-One Comprehensive Guide to Mastering Enterprise Network Core Technologies!

In the LISP (Locator/ID Separation Protocol) architecture, the Endpoint Identifier (EID) serves as a unique identifier for a network endpoint. This is crucial because LISP separates the identity of a device (the EID) from its location on the network (the Routing Locator or RLOC). This separation allows for more flexibility and scalability in network design, making it easier to manage devices as they move between different networks or subnets.

EIDs can be IP addresses that identify hosts, and they are essential for the functionality of LISP in providing services like mobility and multihoming. Since the EID represents the actual endpoint and facilitates the traversal of packets to the destination endpoint, it plays a vital role in the communication process within LISP. This unique identification helps in simplifying address management and establishing associations between identifiers and their respective locations in the network.

The other potential options do not accurately describe the role of the EID within the LISP protocol:

- The address of the physical router would refer to the actual network device rather than the endpoint itself.

- The location of the egress router pertains to the routing aspect of the protocol, specifically concerning where packets exit the network, rather than identifying an endpoint.

- The identifier of a routing protocol