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Difficulty: MediumPhysical Interface and Cabling Types

A network technician needs to connect a router FastEthernet interface directly to a server FastEthernet interface without using an intermediate switch. Both device interfaces have Auto-MDIX disabled. The technician terminates the first end of an Ethernet cable using the T568B standard (Pin 1: White/Orange, Pin 2: Orange, Pin 3: White/Green, Pin 6: Green). Which color wiring pinout must be used on the opposite RJ-45 connector to ensure a functional connection?

  1. Pin 1: White/Green, Pin 2: Green, Pin 3: White/Orange, Pin 6: Orange (T568A standard)Answer
  2. B
    Pin 1: White/Orange, Pin 2: Orange, Pin 3: White/Green, Pin 6: Green (T568B standard)
  3. C
    Pin 1: Brown, Pin 2: White/Brown, Pin 3: Green, Pin 6: White/Green (Rollover layout)
  4. D
    Pin 1: Blue, Pin 2: White/Blue, Pin 3: White/Orange, Pin 6: Orange (Non-standard layout)

Answer

Terminating the opposite end using the T568A standard (Pin 1: White/Green, Pin 2: Green, Pin 3: White/Orange, Pin 6: Orange) creates a functional crossover cable by crossing transmit pins 1 and 2 with receive pins 3 and 6.
Because both the router and server act as DTE devices, transmitting on pins 1 and 2 and receiving on pins 3 and 6, connecting them directly without Auto-MDIX requires a crossover cable. Terminating one end with T568B and the other with T568A ensures that the transmit pins on one end connect directly to the receive pins on the other.

Step-by-Step Solution

1
Identify the roles of the interconnected devices and Auto-MDIX status
Both the router interface and server interface act as DTE devices that transmit on pins 1 and 2 and receive on pins 3 and 6.
Direct connection between like DTE devices requires a crossover cable when Auto-MDIX is unavailable to automatically swap pin assignments.
2
Determine the standard pinout requirement for an Ethernet crossover cable
One end must be terminated with T568B and the opposing end terminated with T568A.
This configuration swaps pair 2 (orange, pins 1 and 2) with pair 3 (green, pins 3 and 6).
3
Select the correct T568A wire sequence for the second connector
Pin 1: White/Green, Pin 2: Green, Pin 3: White/Orange, Pin 6: Orange.
Matching T568A on the second end aligns the first end's transmit pins with the second end's receive pins.

Key Concept

Ethernet Crossover Cable Pinout (T568A to T568B)
Estimated Time:1m 0s
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Topics

Physical Interface and Cabling Types

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