A technician grabs a network cable and connects two switches together. However, the ports fail to come up as indicated by the link lights. Which of the following is MOST likely the issue?

The correct answer is C. Straight through instead of cross over cable. On older or non-auto-sensing equipment, the type of Ethernet cable matters based on what devices are being connected. A straight-through cable connects unlike devices (e.g., switch to PC), while a crossover cable connects like devices (e.g., switch to switch, PC to PC). Using a…

Network troubleshooting

Question

Options

AWrong subnet mask on the interfaces
BMismatched MTU size
CStraight through instead of cross over cable
DSSID mismatch between the switches

How the community answered

(31 responses)

B
3% (1)
C
90% (28)
D
6% (2)

Explanation

On older or non-auto-sensing equipment, the type of Ethernet cable matters based on what devices are being connected. A straight-through cable connects unlike devices (e.g., switch to PC), while a crossover cable connects like devices (e.g., switch to switch, PC to PC). Using a straight-through cable between two switches means the transmit pins on one end connect to the transmit pins on the other, preventing a proper electrical link from forming, which is why the link lights stay off. Modern switches with Auto-MDI/MDIX can compensate, but older hardware cannot. Options A and B would not prevent the physical link from coming up, and D (SSID) is a wireless concept irrelevant to wired switches.

Topics

#crossover cable#straight-through cable#switch interconnect#cable type

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