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Zorluk: OrtaNetwork Cable Types and Connectors

A network administrator needs to establish a local out-of-band management connection to a newly installed enterprise switch using a modern laptop that lacks a serial port. The switch features a traditional DB9 RS-232 console interface. Which cable and adapter combination should the administrator use to connect to the switch?

  1. A USB-to-DB9 serial adapter coupled with a DB9-to-RJ45 rollover cableCevap
  2. B
    A Category 6 UTP straight-through Ethernet patch cable plugged directly into an Ethernet port
  3. C
    A Category 5e UTP crossover Ethernet cable connected to the switch's uplink port
  4. D
    A single-mode fiber optic patch cable with LC connectors attached to an SFP transceiver

Cevap

The administrator should use a USB-to-DB9 serial adapter coupled with a DB9-to-RJ45 rollover cable.
Out-of-band management on unconfigured switches requires an RS-232 serial connection. Since modern laptops only feature USB ports, a USB-to-DB9 serial adapter creates a virtual COM port. Combining this adapter with a rollover cable (or DB9 console cable) correctly routes serial transmit and receive signals to the device's console port.

Adım Adım Çözüm

1
Identify the management interface requirements
The target switch requires an out-of-band RS-232 serial terminal session via a DB9/RJ45 console port.
Unconfigured network hardware cannot be accessed via IP network protocols (such as SSH or HTTPS) until initial configuration is completed.
2
Determine the host workstation port capabilities
Modern laptops lack native DB9 RS-232 serial ports and rely on USB interfaces.
An active protocol conversion adapter (USB-to-DB9 serial) is necessary to map USB signals to a serial COM port.
3
Select the appropriate cable wiring standard for serial console access
A rollover cable (where pinouts are inverted end-to-end) converts DB9 serial signals into the console port format.
Rollover pinouts are specifically wired to connect host serial COM interfaces to networking appliance console ports.

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Serial Console Cables and Adapters
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Network Cable Types and Connectors

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