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.
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)- A92% (23)
- B4% (1)
- E4% (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.
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.
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.
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.
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.
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
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