nerdexam
CompTIA

SK0-004 · Question #406

A server technician is connecting a server directly to a multilayer switch, without MDI-X. Which of the following cables should the server technician use?

The correct answer is D. Straight through. Connecting a server (MDI device) to a multilayer switch (MDI-X device) without auto-MDI-X requires a straight-through cable because the two device types use complementary pinouts.

Server hardware installation and management

Question

A server technician is connecting a server directly to a multilayer switch, without MDI-X. Which of the following cables should the server technician use?

Options

  • ACrossover
  • BCoaxial
  • CRollover
  • DStraight through

How the community answered

(30 responses)
  • A
    3% (1)
  • B
    7% (2)
  • D
    90% (27)

Why each option

Connecting a server (MDI device) to a multilayer switch (MDI-X device) without auto-MDI-X requires a straight-through cable because the two device types use complementary pinouts.

ACrossover

A crossover cable swaps the transmit and receive pairs and is used to connect two like devices such as server to server or switch to switch, not a server to a switch.

BCoaxial

Coaxial cable is used in legacy network standards such as 10BASE2 and is incompatible with modern Ethernet switch ports and server NICs.

CRollover

A rollover cable is a console cable used for out-of-band management access to a device's serial console port and does not carry Ethernet data traffic.

DStraight throughCorrect

A server NIC is an MDI device that transmits on pins 1 and 2 and receives on pins 3 and 6, while a multilayer switch port is an MDI-X device with the inverse pinout - receiving on pins 1 and 2 and transmitting on pins 3 and 6. A straight-through cable connects each pin directly to its counterpart, properly aligning the transmit pairs on one end with the receive pairs on the other. Auto-MDI-X automates cable-type detection and correction, but without it, a straight-through cable is still the correct manual choice when connecting unlike device types.

Concept tested: Ethernet cable type selection - MDI vs MDI-X device pairing

Source: https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6000-series-switches/12006-MDI-MDIX.html

Topics

#network cabling#straight-through cable#MDI-X#switch connectivity

Community Discussion

No community discussion yet for this question.

Full SK0-004 Practice