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Difficulty: MediumPhysical Interface and Cabling Types

A network engineer is designing a 10 Gigabit Ethernet trunk link between two distribution switches located 250 meters apart in a campus environment. Which of the following transceiver and cabling combinations will successfully establish and support this 10 Gbps connection over the specified distance? (Select two.)

  1. 10GBASE-SR SFP+ transceivers connected via OM3 multimode fiber optic cablingAnswer
  2. 10GBASE-LR SFP+ transceivers connected via single-mode fiber optic cablingAnswer
  3. C
    10GBASE-SR SFP+ transceivers connected via Category 6 Unshielded Twisted Pair (UTP) cabling
  4. D
    10GBASE-SR SFP+ transceivers connected via legacy OM1 (62.5/125 ��m) multimode fiber optic cabling
  5. E
    1000BASE-SX SFP transceivers connected via single-mode fiber optic cabling

Answer

The 10 Gigabit Ethernet link over 250 meters can be supported using 10GBASE-SR transceivers with OM3 multimode fiber or 10GBASE-LR transceivers with single-mode fiber.
The combination of 10GBASE-SR with OM3 multimode fiber supports 10 Gbps up to 300 meters, which comfortably reaches the required 250 meters. Similarly, 10GBASE-LR transceivers with single-mode fiber support 10 Gbps up to 10 kilometers, making both options fully compliant with the design constraints.

Step-by-Step Solution

1
Evaluate bandwidth and physical distance parameters.
Required data rate is 10 Gbps; required distance is 250 meters.
Transceiver optics and media standards are defined by maximum supported reach and speed capabilities.
2
Analyze multimode fiber (MMF) specifications for 10 Gbps operation.
10GBASE-SR over OM3 MMF supports distances up to 300 m (and up to 400 m on OM4), whereas legacy OM1 MMF only supports up to 33 m.
OM3 fiber has higher modal bandwidth allowing 10GBASE-SR light signals to travel up to 300 meters without unacceptable modal dispersion.
3
Analyze single-mode fiber (SMF) specifications for 10 Gbps operation.
10GBASE-LR over SMF supports distances up to 10 km (10,000 meters).
Single-mode fiber uses narrow core diameters and lasers, eliminating modal dispersion and easily covering 250 meters.

Key Concept

Physical Interface and Cabling Specifications for Ethernet Transceivers
Estimated Time:1m 30s
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Physical Interface and Cabling Types

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