CompTIA Network+ (N10-006) — Question 43

Which of the following protocols is used to encapsulate other network layer protocols such as multicast and IPX over WAN connections?

Answer options

• A. MPLS
• B. ESP
• C. GRE
• D. PPP

Correct answer: C

Explanation

GRE (Generic Routing Encapsulation) is specifically designed to encapsulate a variety of network layer protocols, making it suitable for carrying multicast and IPX. MPLS, while efficient for data forwarding, does not encapsulate other protocols in the same way. ESP (Encapsulating Security Payload) is focused on providing encryption and security, and PPP (Point-to-Point Protocol) is primarily for direct connections rather than encapsulating multiple protocols.