300-420 · Question #89
You need to connect sites that are 8 kilometers apart by using fiber. Which media do you recommend?
The correct answer is C. 10GBASE-LR. For connecting sites 8 kilometers apart using fiber at 10 Gigabit Ethernet speeds, 10GBASE-LR is the recommended media type.
Question
You need to connect sites that are 8 kilometers apart by using fiber. Which media do you recommend?
Options
- A10GBASE-T
- B10GBASE-ER
- C10GBASE-LR
- D10GBASE-SR
How the community answered
(50 responses)- A2% (1)
- B4% (2)
- C92% (46)
- D2% (1)
Why each option
For connecting sites 8 kilometers apart using fiber at 10 Gigabit Ethernet speeds, 10GBASE-LR is the recommended media type.
10GBASE-T uses unshielded twisted pair (UTP) copper cabling and has a maximum distance of 100 meters, which is far too short for an 8-kilometer connection.
10GBASE-ER uses single-mode fiber for extended reach, supporting distances up to 40 kilometers, which would work but is generally more expensive and an overkill for 8km when LR is sufficient.
10GBASE-LR uses single-mode fiber and is designed for long-reach connections up to 10 kilometers. An 8-kilometer distance falls well within the specification for 10GBASE-LR, making it a suitable choice for this requirement.
10GBASE-SR uses multi-mode fiber and has a maximum distance of 300-400 meters depending on the fiber type, which is insufficient for 8 kilometers.
Concept tested: 10 Gigabit Ethernet fiber standards and distances
Source: https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html
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