Which two components are supported by LISP? (choose two )

Question

Options

• Aproxy ETR
• Begress tunnel router
• Croute reflector
• DHMAC algorithm
• Espoke

• A
  90% (26)
• C
  3% (1)
• D
  7% (2)

Explanation

LISP Components Explained

LISP (Locator/ID Separation Protocol) defines specific functional components for separating endpoint identifiers from routing locators. The Proxy ETR (pETR) is a valid LISP component that acts on behalf of non-LISP sites, allowing LISP sites to communicate with non-LISP destinations. The Egress Tunnel Router (ETR) is a core LISP component that receives packets and maps locators back to endpoint identifiers, making both A and B correct.

Why the distractors are wrong:

• C (Route Reflector) is a BGP concept used to reduce iBGP mesh requirements - it has no role in LISP architecture
• D (HMAC Algorithm) is a cryptographic hashing method used in security protocols, not a LISP structural component
• E (Spoke) is a term from hub-and-spoke WAN/DMVPN topologies, not part of LISP terminology

Memory Tip: Remember LISP's four core components using "I-EMS" - ITR (Ingress Tunnel Router), ETR (Egress Tunnel Router), MS (Map Server), and MR (Map Resolver), plus the proxy variants (pITR/pETR) for non-LISP interoperability. If a term belongs to BGP, crypto, or VPN topologies, it's not a LISP component.

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