JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing — Question 50

You are asked to configure a GRE tunnel between two remote sites to support the exchange of IPv6 traffic. The two sites are separated by an IPv4 network.
Which two configuration elements are required? (Choose two.)

Answer options

• A. You must enable the GRE interface for IPv6 operations.
• B. You must increase the MTU to no less than 2500.
• C. You must add a static route for the remote IPv6 destination subnet with the remote tunnel endpoint as the next hop at each site.
• D. You must enable the GRE interface for IPv4 operations.

Correct answer: C, D

Explanation

The correct answers are C and D. Configuring a static route (C) is essential for directing traffic to the remote IPv6 subnet via the GRE tunnel, while enabling the GRE interface for IPv4 operations (D) is necessary because the tunnel itself operates over an IPv4 network. Options A and B are incorrect because enabling the GRE interface for IPv6 operations is not required, and the MTU size does not need to be set at a minimum of 2500 for GRE tunnels.