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SK0-005 · Question #198

An administrator is wiring some Cat 5 cable into a serial cable. Which of the following wiring types should the administrator use?

The correct answer is A. Rollover. To wire a Cat 5 cable into a serial cable, the administrator should use a rollover wiring type.

Server administration

Question

An administrator is wiring some Cat 5 cable into a serial cable. Which of the following wiring types should the administrator use?

Options

  • ARollover
  • BCrossover
  • CEIA 568A on both ends
  • DStraight-through

How the community answered

(22 responses)
  • A
    95% (21)
  • D
    5% (1)

Why each option

To wire a Cat 5 cable into a serial cable, the administrator should use a rollover wiring type.

ARolloverCorrect

Rollover cables are specifically designed for console connections to network devices like routers and switches, mapping pins from one end to the opposite end (e.g., pin 1 to 8, 2 to 7, etc.) to allow a serial port on a computer to communicate with the device's console port.

BCrossover

Crossover cables are used to connect two devices of the same type directly (e.g., PC-to-PC, switch-to-switch) by crossing transmit and receive pairs, which is not suitable for a serial console connection.

CEIA 568A on both ends

EIA 568A on both ends describes a straight-through cable, which is used for connecting dissimilar network devices but not for serial console connections where pin reversal is required.

DStraight-through

Straight-through cables connect dissimilar devices (e.g., computer to switch) without crossing internal wire pairs, which is incorrect for the pin-reversal required in a serial console connection.

Concept tested: Network cable types - Rollover vs. Crossover

Source: https://www.cisco.com/c/en/us/td/docs/routers/access/cisco_2600_series/hardware/installation/guide/2600hig/26cab.html

Topics

#Networking cables#Console cables#Rollover wiring#Serial communication

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