Which of the following is the most likely technology used for an access link to a Metro Ethernet service?
- 100BASE-LX10
- High-speed TDM (for example, T3, E3)
- MPLS
- 100BASE-T
Explanation: Metro Ethernet uses Ethernet access links of various types. Time-division multiplexing (TDM) links such as serial links, even higher-speed links like T3 and E3, do not use Ethernet protocols, and are less likely to be used. MPLS is a WAN technology that creates a Layer 3 service.
Two answers refer to Ethernet standards usable as the physical access link for a Metro Ethernet service. However, 100BASE-T supports cable lengths of only 100 meters, so it is less likely to be used as a Metro Ethernet access link in comparison to 100BASELX10, which supports lengths of 10 km.
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