200-301 · Question #865
What is a similarity between 1000BASE-LX and 1000BASE-T standards?
The correct answer is A. Both use the same data-link header and trailer formats.. Both 1000BASE-LX (fiber) and 1000BASE-T (copper) standards share the same fundamental Ethernet data-link layer frame format, despite their physical layer differences.
Question
Options
- ABoth use the same data-link header and trailer formats.
- BBoth cable types support RJ-45 connectors.
- CBoth support up to 550 meters between nodes.
- DBoth cable types support LR connectors.
How the community answered
(38 responses)- A95% (36)
- C3% (1)
- D3% (1)
Why each option
Both 1000BASE-LX (fiber) and 1000BASE-T (copper) standards share the same fundamental Ethernet data-link layer frame format, despite their physical layer differences.
Both 1000BASE-LX and 1000BASE-T are implementations of Gigabit Ethernet, which means they operate at the same data-link layer (Layer 2) and therefore utilize the identical Ethernet frame format, including the header (destination/source MAC, EtherType) and trailer (FCS). The differences between them lie primarily at the physical layer (Layer 1).
1000BASE-T uses RJ-45 connectors for twisted-pair copper cabling, whereas 1000BASE-LX uses fiber optic connectors like LC or SC, not RJ-45.
1000BASE-T supports distances up to 100 meters, while 1000BASE-LX can support much greater distances, typically up to 550 meters over multimode fiber or up to 5 km over single-mode fiber.
LR (Long Reach) connectors typically refer to specific types of optical transceivers for long-distance single-mode fiber, which are associated with 1000BASE-LX but not with 1000BASE-T copper cabling.
Concept tested: Ethernet frame format consistency across physical media
Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/consolidated/configuration_guide/b_consolidated_3850_3se_cg/b_consolidated_3850_3se_cg_chapter_01000.html
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