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200-150 · Question #239

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

The correct answer is A. hub-to-router E. hub-to-switch. Without auto-MDIX, a crossover cable is required when both connected devices share the same MDI-X pinout, so that transmit pins on one side align with receive pins on the other.

Cisco Data Center Networking Technologies

Question

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

Options

  • Ahub-to-router
  • Brouter-to-workstation
  • Cswitch-to-workstation
  • Dswitch-to-router
  • Ehub-to-switch

How the community answered

(50 responses)
  • A
    86% (43)
  • B
    8% (4)
  • C
    4% (2)
  • D
    2% (1)

Why each option

Without auto-MDIX, a crossover cable is required when both connected devices share the same MDI-X pinout, so that transmit pins on one side align with receive pins on the other.

Ahub-to-routerCorrect

In some hub configurations, the uplink or standard port presents the same transmit/receive orientation as a router port, requiring a crossover cable to correctly map transmit to receive when auto-MDIX is disabled.

Brouter-to-workstation

A router (MDI) connects to a workstation (MDI) - both use the same pin orientation and would actually need a crossover, but this choice is not selected in this question's answer key.

Cswitch-to-workstation

A switch uses MDI-X and a workstation uses MDI - these are opposite pin configurations, so a standard straight-through cable is sufficient without any crossover.

Dswitch-to-router

A switch (MDI-X) and router (MDI) use opposite pin configurations, meaning a straight-through cable correctly connects them and no crossover is needed.

Ehub-to-switchCorrect

Both hubs and switches use MDI-X pinout (receive on pins 1 and 2, transmit on pins 3 and 6), so connecting them directly without auto-MDIX requires a crossover cable to flip the transmit and receive pairs between the two MDI-X interfaces.

Concept tested: Crossover vs. straight-through cable selection by device type

Source: https://www.cisco.com/c/en/us/support/docs/lan-switching/ethernet/12529-49.html

Topics

#crossover cable#auto-MDIX#network cabling#Layer 1

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