Joe, a technician, is troubleshooting an issue with a PC suddenly losing network connectivity. He has confirmed that the cable is plugged in and has swapped it with a known working cable. Joe then…

Question

Options

• AThe computer has the wrong DNS server configured.
• BThe TCP drivers are corrupted.
• CThe cable has been unplugged from the patch panel.
• DThe routing table on the router is corrupted.
• EThere is RF interference on the cable.
• FThe NIC is no longer functioning properly.

• B
  65% (15)
• C
  9% (2)
• D
  22% (5)
• E
  4% (1)

Explanation

127.0.0.1 is the loopback address - it tests whether the local TCP/IP stack is functioning. A successful ping to 127.0.0.1 never leaves the machine; it is handled entirely within the OS. If this ping fails, the problem must be internal to the machine's network stack or hardware. Corrupted TCP drivers (B) would prevent the TCP/IP stack from processing even loopback traffic. A failed NIC (F) would prevent all network communication. Wrong DNS (A) has no effect on pinging an IP address directly. Patch panel issues (C) or router routing tables (D) are external and would not affect the loopback interface. RF interference (E) only affects wireless signals, not loopback.

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