Which command can you enter to verify echo request and echo reply?

Question:
Which command can you enter to verify echo request and echo reply?

• ping
• traceroute
• tracert
• telnet

Explanation: The ping command first sends an echo request packet to an address, then waits for an echo reply. The ping is successful only if:
+ The echo request gets to the destination, and
+ The destination is able to get an echo reply back to the source within a predetermined time called a timeout. The default value of this timeout is two seconds on Cisco routers.

Reference: http://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/ios-software-releases-121-mainline/12778-ping-traceroute.html

Exam with this question: CCNA v3.0 (200-125) Study Guide – Exam Dumps