An administrator is connecting a laptop to administer a switch using an Ethernet cable, which works on a PC to a wall jack. The switch is functioning, but the administrator is unable to establish a…

The problem statement explicitly states the switch is functioning, ruling out the entire switch being faulty.

The administrator has already validated the Ethernet cable by testing it from a PC to a wall jack, eliminating the cable as the source of the problem. The switch itself is confirmed to be functioning, so the fault is isolated to the specific port being used for the connection. A faulty port - whether physically damaged, administratively shut down, or in an error state - would block connectivity even when all other components are working.

A rollover cable is used for serial console access to network devices, not for standard Ethernet connectivity - however, the cable described already works between a PC and a wall jack, confirming it is a standard Ethernet cable, not a rollover.

A straight-through cable is the correct cable type for connecting a PC or laptop to a switch port, so using one would not prevent an Ethernet connection from being established.