Which of the following Layer 1 WAN technologies is not normally used as last mile service, but rather traverses multiple ISP networks, connecting these networks to the Internet backbone?
A) SONET (Synchronous Optical Network)
B) T-carrier (T1s, fractional T1s, and T3s)
C) Carrier-Ethernet Transport (CET)
D) digital subscriber line (DSL)

Question

Quizplus · Accepted Answer

SONET is typically used to connect ISP networks together rather than as a last mile service to individual customers or businesses. T-carrier and CET can both be used as last mile solutions, and DSL is specifically designed for last mile connectivity.

Which of the Following Layer 1 WAN Technologies Is Not