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200-150 · Question #164

When the auto-MDIX is disabled, which two network configuration require a crossover cable? (Choose two)

The correct answer is A. hub-to-switch C. router-to-workstation. Without auto-MDIX, a crossover cable is required when connecting two devices of the same MDI type (both MDI or both MDI-X) because their transmit and receive pins would otherwise conflict.

Cisco Data Center Networking Technologies

Question

When the auto-MDIX is disabled, which two network configuration require a crossover cable? (Choose two)

Options

  • Ahub-to-switch
  • Bswitch-to-workstation
  • Crouter-to-workstation
  • Dhub-to-router
  • ESwitch-to-router

How the community answered

(25 responses)
  • A
    92% (23)
  • B
    4% (1)
  • E
    4% (1)

Why each option

Without auto-MDIX, a crossover cable is required when connecting two devices of the same MDI type (both MDI or both MDI-X) because their transmit and receive pins would otherwise conflict.

Ahub-to-switchCorrect

Hubs and switches are both MDI-X devices that use the same transmit and receive pin assignments on their ports; connecting two MDI-X devices requires a crossover cable to swap the transmit pair of one end with the receive pair of the other, enabling proper communication.

Bswitch-to-workstation

A switch is an MDI-X device and a workstation is an MDI device - they are unlike types, so their pins are already complementary and a standard straight-through cable provides the correct transmit-to-receive alignment.

Crouter-to-workstationCorrect

Routers and workstations are both MDI (endpoint) devices sharing identical pin configurations; without auto-MDIX to compensate, a crossover cable is required to align each device's transmit pins with the other's receive pins.

Dhub-to-router

A hub (MDI-X) and a router (MDI) are unlike device types whose pins align naturally, requiring a straight-through cable - not a crossover - for proper communication.

ESwitch-to-router

A switch (MDI-X) and a router (MDI) are unlike device types, so a straight-through cable correctly maps the switch's transmit pins to the router's receive pins without any crossover needed.

Concept tested: MDI vs MDI-X crossover cable selection

Source: https://www.cisco.com/c/en/us/support/docs/lan-switching/ethernet/12006-46.html

Topics

#auto-MDIX#crossover cable#network cabling#Ethernet cable types

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