A network administrator has just been notified about the loss of Internet connectivity. Another technician had just performed non-scheduled maintenance and mentioned that some cabling may have been…

The correct answer is B. TX/RX cables reversed. Since cabling was physically moved during maintenance, the most likely cause is that the transmit (TX) and receive (RX) cables were accidentally swapped when reconnected - this is called a crossover error on a straight-through connection, and it would immediately break the…

Network troubleshooting

Question

A network administrator has just been notified about the loss of Internet connectivity. Another technician had just performed non-scheduled maintenance and mentioned that some cabling may have been moved. Which of the following MOST likely caused the loss of Internet connectivity?

Options

ABroadcast storm
BTX/RX cables reversed
CMismatched MTU
DIncorrect routing table

How the community answered

(34 responses)

B
91% (31)
C
6% (2)
D
3% (1)

Explanation

Since cabling was physically moved during maintenance, the most likely cause is that the transmit (TX) and receive (RX) cables were accidentally swapped when reconnected - this is called a crossover error on a straight-through connection, and it would immediately break the link. Broadcast storms (A) are caused by switching loop issues, not cable moves. Mismatched MTU (C) typically causes intermittent performance issues, not total loss. An incorrect routing table (D) is a software/configuration issue unrelated to physically moving cables.

Topics

#TX/RX reversed#cabling#connectivity loss#physical layer troubleshooting

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