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.
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)- A3% (1)
- B7% (2)
- D90% (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.
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.
Coaxial cable is used in legacy network standards such as 10BASE2 and is incompatible with modern Ethernet switch ports and server NICs.
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.
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
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