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Difficulty: MediumPhysical Interface and Cabling Types

A network administrator is evaluating physical cabling and optical transceiver specifications for a new campus network deployment. Which two statements accurately describe Ethernet physical interface and cabling requirements? (Select TWO.)

  1. 10GBASE-SR transceivers utilize multimode fiber (MMF) with LC connectors for short-distance transmission up to several hundred meters.Answer
  2. 1000BASE-T operation requires all four wire pairs of Category 5e or higher unshielded twisted-pair (UTP) cabling.Answer
  3. C
    1000BASE-SX optical transceivers use single-mode fiber (SMF) to achieve link distances of up to 10 kilometers.
  4. D
    Connecting two like devices, such as switch-to-switch FastEthernet interfaces with Auto-MDIX disabled, requires a standard straight-through cable.
  5. E
    Category 6a UTP cabling restricts 10GBASE-T copper Ethernet links to a maximum distance of 37 meters.

Answer

The correct statements are that 10GBASE-SR transceivers utilize multimode fiber (MMF) with LC connectors for short distances, and 1000BASE-T requires all four pairs of UTP cabling.
10GBASE-SR is designed for short-reach multimode fiber up to 300 meters using LC connectors. Additionally, 1000BASE-T standard mandates the use of all four pairs (8 wires) in Cat5e or higher twisted-pair cabling to transmit 1 Gbps data rates.

Step-by-Step Solution

1
Analyze optical transceiver standards and media compatibility
10GBASE-SR specifies Short Range operation over 850 nm multimode fiber using LC connectors, making the 10GBASE-SR MMF statement correct. 1000BASE-SX also uses MMF (not SMF), making the 1000BASE-SX SMF statement incorrect.
Optical optics are differentiated by wavelength, distance capability (SR vs LR/LX), and fiber modal type (MMF vs SMF).
2
Analyze copper twisted-pair cabling specifications and pinouts
1000BASE-T requires all four pairs of Category 5e/6 UTP for full Gigabit transmission. Category 6a supports 10GBASE-T up to 100 meters (not restricted to 37 meters).
Gigabit Ethernet utilizes five-level pulse amplitude modulation (PAM-5) across all four pairs simultaneously.
3
Verify MDI/MDI-X cable requirements
Connecting identical layer devices (switch to switch) when Auto-MDIX is turned off requires crossover wiring so transmit pins connect to receive pins.
Straight-through cables connect MDI to MDI-X devices (e.g., switch to host); like-to-like connections require crossover pinouts.

Key Concept

Physical Ethernet standards specify distinct transceiver optics, fiber types, cable categories, and pinout pairings based on bandwidth and distance requirements.
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Topics

Physical Interface and Cabling Types

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