CCIE Data Center (legacy) — Question 19

When deploying a sensor network that uses CoAP, which of the following must be done on the firewall to allow sensor traffic into the data center?

Answer options

• A. Permit UDP traffic from the sensor IP address range.
• B. Configure stateful inspection for ROLL.
• C. Enable NAT64.
• D. Permit IP Option 135 traffic from the sensor IP address range(s).

Correct answer: D

Explanation

The correct answer is D because IP Option 135 is necessary for the proper operation of CoAP traffic between sensors and the data center. Options A, B, and C are incorrect as they do not address the specific requirements of CoAP, which relies on the IP Option 135 for its communication and does not inherently use NAT or require stateful inspection for ROLL.