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Difficulty: EasyNetwork and Peripheral Cables and Connectors

A field technician needs to establish a direct local management session from a legacy maintenance laptop featuring a DB-9 serial port to the RJ45 console port of a newly mounted network switch. Which cable type should the technician use to successfully establish this management connection?

  1. DB-9 to RJ45 rollover cableAnswer
  2. B
    Standard T568B twisted-pair patch cable
  3. C
    USB Type-C to DisplayPort adapter cable
  4. D
    Single-link DVI to HDMI video cable

Answer

The technician should use a DB-9 to RJ45 rollover cable to connect the DB-9 serial interface on the workstation to the switch's RJ45 console port.
Connecting a computer's serial port (DB-9) to a router or switch management port (RJ45) requires a rollover cable (or serial console cable). This cable properly routes serial transmit and receive signals to establish out-of-band terminal management.

Step-by-Step Solution

1
Identify the ports on both host and target devices
The host laptop has a 9-pin D-subminiature (DB-9) serial port, while the switch management interface is an RJ45 console port.
Out-of-band administrative access requires matching host serial signaling with target console pinouts.
2
Select the appropriate serial conversion cable type
Choose a DB-9 to RJ45 rollover (console) cable.
Rollover cables roll the pin positions from one end to the other to correctly pair transmit (TX), receive (RX), and ground pins between DB-9 serial controllers and RJ45 console interfaces.

Key Concept

Serial and Console Cable Standards
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Topics

Network and Peripheral Cables and Connectors

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