350-401 Question 110
Select 3An enterprise is implementing LISP (Locator/ID Separation Protocol) in their network to improve scalability and simplify multihoming. During the configuration process, they need to ensure that the Routing Locator (RLOC) mapping is properly registered with the Map-Server. Which of the following components are required for a successful registration process in a LISP-enabled environment?
- A
The EID-to-RLOC mapping must be configured on the LISP-enabled device.
- B
The Map-Server must be reachable via the underlay network.
- C
An IGP (Interior Gateway Protocol) must be configured to share EID prefixes between LISP sites.
- D
The LISP device must authenticate with the Map-Server for registration.
- E
The RLOC must be dynamically learned through BGP.
Show answer and explanation
Correct answers: A, B, D
Explanation
For successful LISP operation, the EID-to-RLOC mapping must be configured on the LISP-enabled device and registered with the Map-Server, which must be reachable via the underlay network. Authentication ensures security during the registration process. LISP does not rely on traditional routing protocols like IGP or BGP for its core functionality, as it introduces a mapping and encapsulation mechanism that separates endpoint identifiers (EIDs) from locators (RLOCs).
- A. Correct.
Correct: The EID-to-RLOC mapping is fundamental for LISP operation. This mapping allows the LISP router to associate endpoint identifiers (EIDs) with locators (RLOCs). Without this, the Map-Server cannot manage the mappings correctly.
- B. Correct.
Correct: The Map-Server must be reachable via the underlying network for the LISP router to successfully register the EID-to-RLOC mappings.
- C. Incorrect.
Incorrect: An IGP is not required for LISP to function. LISP is designed to decouple the routing of EIDs from traditional routing protocols like IGP, relying instead on the Map-Server and Map-Resolver.
- D. Correct.
Correct: Authentication between the LISP device and the Map-Server is often required to ensure security and prevent unauthorized devices from registering mappings.
- E. Incorrect.
Incorrect: The RLOC is not dynamically learned through BGP in LISP. The RLOC is manually configured or derived from the local device configuration.