JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing (2022) — Question 30

Which two statements describe operations performed by the encapsulating tunnel endpoint in an IP-IP tunnel? (Choose two.)

Answer options

• A. It decrements the time-to-live (TTL) counter by one in the inner IP header
• B. It modifies the source and destination addresses in the inner IP header
• C. It adds an outer IP header with the destination address of the remote tunnel endpoint
• D. It creates and adds a new inner IP header with the remote destination device's IP address

Correct answer: A, C

Explanation

The correct answers are A and C because the encapsulating tunnel endpoint does indeed decrement the TTL in the inner IP header and adds an outer IP header with the remote endpoint's address. Options B and D are incorrect as they imply modifications to the inner IP header's addresses or creation of a new inner header, which are not functions of the encapsulating tunnel endpoint.