350-401 Question 109
Single answerYour organization is deploying a Locator/ID Separation Protocol (LISP) architecture to improve scalability and simplify endpoint mobility. During the configuration, you need to ensure that the LISP control plane is capable of mapping Endpoint Identifiers (EIDs) to Routing Locators (RLOCs). Which LISP component is responsible for storing these mappings and responding to queries from the LISP control plane?
- A
Map-Resolver (MR)
- B
Map-Server (MS)
- C
Ingress Tunnel Router (ITR)
- D
Egress Tunnel Router (ETR)
Show answer and explanation
Correct answer: B
Explanation
In the LISP architecture, the Map-Server (MS) is a key control-plane component responsible for maintaining the database of EID-to-RLOC mappings. It allows other LISP components, such as the ITRs and ETRs, to perform efficient forwarding by providing the necessary mapping information during lookups. Understanding the roles of LISP components is critical for configuring and troubleshooting a LISP-enabled network.
- A. Incorrect.
The Map-Resolver (MR) is responsible for receiving mapping queries from ITRs and forwarding them to the appropriate Map-Server. It is not responsible for storing the mappings itself.
- B. Correct.
The Map-Server (MS) is the component responsible for storing EID-to-RLOC mappings and responding to queries, making it the correct answer.
- C. Incorrect.
The Ingress Tunnel Router (ITR) is responsible for encapsulating packets from the source EID and forwarding them to the appropriate RLOC. It does not store mappings.
- D. Incorrect.
The Egress Tunnel Router (ETR) is responsible for decapsulating packets arriving at the RLOC and forwarding them to the destination EID. It also does not store mappings.