JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing (2021) — Question 19

Which statement is true about GRE encapsulation?

Answer options

• A. Only the IP payload is encapsulated by GRE.
• B. Only the IP header is encapsulated by GRE.
• C. The entire packet is encapsulated by GRE.
• D. The entire frame is encapsulated by GRE.

Correct answer: B

Explanation

The correct answer is B, as GRE encapsulates the original IP packet's header, not the entire packet or frame. Options A and C are incorrect because GRE includes the header but not just the payload or the whole packet. Option D is also incorrect because GRE does not encapsulate the entire frame, but specifically the IP header.