Practice Quiz

Advanced Networking Administrator Test Prep

Category - CCNA

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Dave is trying to telnet to a router at the address 200.124.35.2 from a host with an IP address 203.24.35.2. The telnet session does not initiate and he suspects an issue with the protocol stack. Which of the following commands should he use?
  1. ping 200.124.35.2
  2. telnet 127.0.0.1
  3. ping 127.0.0.1
  4. tracert 200.124.35.2
Explanation
Answer: C - To verify the integrity of the protocol stack, use the ping 127.0.0.1 command.

Key Takeaway: 127.0.0.1 is known as the loopback address. When the ping 127.0.0.1 is executed, the host computer will send out four packets and will receive four packets in return, with a 0% loss report. This verifies that the network interface card is working. It also assures that the drivers for that device also work and that your computer’s TCP/IP is functioning, as well.
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