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.
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)- A86% (43)
- B8% (4)
- C4% (2)
- D2% (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.
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.
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.
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.
A switch (MDI-X) and router (MDI) use opposite pin configurations, meaning a straight-through cable correctly connects them and no crossover is needed.
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
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