ICND2: Interconnecting Cisco Networking Devices Part 2 (legacy) — Question 66

How does an IP SLA ICMP Echo operation measure response time?

Answer options

• A. it checks the timestamp on source and destination ICMP Time Exceeded messages
• B. it checks the timestamp on ICMP Echo messages
• C. it calculates the time that elapses from when the device sends an ICMP Echo request to when it receives an ICMP Echo reply
• D. It checks the one-way delay of each ICMP Echo packet received

Correct answer: B

Explanation

The correct answer, B, is accurate because the operation measures the response time by analyzing the timestamps of the ICMP Echo messages sent and received. Options A and D are incorrect as they refer to different types of messages and delays that do not directly measure response time, while option C describes a broader calculation that isn't specific to timestamp checking.