JNCIS-ENT: Juniper Networks Certified Specialist – Enterprise Routing and Switching (2024) — Question 10

Which statement is true about IP-IP tunnels?

Answer options

• A. The time-to-live value of the original packet is decremented.
• B. IP-IP tunnels are protocol agnostic.
• C. The packet is encapsulated unchanged before entering the tunnel.
• D. The packet header is replaced before entering the tunnel.

Correct answer: B

Explanation

The correct answer is B because IP-IP tunnels can encapsulate any type of network protocol without being affected by it. Option A is incorrect because the time-to-live (TTL) of the original packet is not decremented until it exits the tunnel. Option C is wrong as the packet is encapsulated, which may involve changes. Option D is also incorrect because the original packet header is not replaced; instead, it is encapsulated within a new header.