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Zorluk: OrtaPhysical Interface and Cabling Types

A network technician is connecting two legacy Cisco switches together using their 100BASE-TX FastEthernet ports. Auto-MDIX is manually disabled on both switch interfaces. Which unshielded twisted-pair (UTP) cable pinout specification is required to establish successful Layer 1 connectivity between these two switches?

  1. A crossover cable with transmit pins 1 and 2 on one connector wired to receive pins 3 and 6 on the opposite connectorCevap
  2. B
    A straight-through cable with pins 1, 2, 3, and 6 connected directly to pins 1, 2, 3, and 6 on both connectors
  3. C
    A rollover cable with pin 1 on one connector wired to pin 8 on the opposite connector
  4. D
    A crossover cable with pins 4 and 5 swapped with pins 7 and 8 while pins 1, 2, 3, and 6 remain straight through

Cevap

A crossover cable with transmit pins 1 and 2 on one connector wired to receive pins 3 and 6 on the opposite connector is required.
Switches default to MDI-X pinouts, transmitting on pins 3 and 6 and receiving on pins 1 and 2. For 100BASE-TX FastEthernet connections between two switches where Auto-MDIX is disabled, pins 1 and 2 on one end must connect to pins 3 and 6 on the other end to link transmit pairs directly to receive pairs.

Adım Adım Çözüm

1
Identify the device types being connected and their default interface pinout roles.
Switches use MDI-X pinouts by default, transmitting data on pins 3 and 6 and receiving data on pins 1 and 2.
Connecting identical device types (MDI-X to MDI-X) means both sides transmit on the same pair of pins by default.
2
Determine the impact of disabling Auto-MDIX on both switch interfaces.
Without Auto-MDIX, the interface hardware cannot dynamically swap its internal transmit/receive pin assignments.
Physical pin crossover must be provided by the cabling infrastructure when hardware auto-detection is inactive.
3
Select the proper UTP pinout for 100BASE-TX FastEthernet crossover cabling.
Pin 1 connects to Pin 3, and Pin 2 connects to Pin 6 across the cable connectors.
This bridges the transmit pair of one switch to the receive pair of the opposing switch and vice versa.

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Ethernet UTP Cable Pinouts and Auto-MDIX Operations
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Physical Interface and Cabling Types

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