You ping the loopback address, but do not receive any response. What do you think is the most likely cause?
  1. DSL router is down.
  2. DNS server is offline.
  3. Network card is being throttled.
  4. TCP/IP protocol is not functioning.
Explanation
Answer - D - If pinging a loop back address does not give a reply, it is most likely that the NIC is faulty and the TCP/IP protocol is not functioning.

Key Takeaway: 127.0.0.1 is the loopback address of a computer. Pinging the loopback address determines if the NIC is working. In case the ping request fails, then the NIC needs to be re-seated or changed.
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