Chapter 15
1. B. Leased lines offer a Layer 1 service, delivering bits to the other end of the link. Frame Relay and Ethernet WAN services offer Layer 2 services delivering data link frames. MPLS delivers IP packets, discarding incoming data link headers.
2. B and C. As a Layer 3 service, MPLS supports a wide variety of access link types, including Ethernet. Ethernet WAN services, by definition, support Ethernet access links.
3. A and D. Both leased lines and Frame Relay use TDM lines (for example, a T1 line), which then uses a serial interface on a router. VSAT uses a specialized router interface, and Ethernet WANs use a router or switch Ethernet interface.
4. A and C. DSL and cable Internet provide an always-on service. Analog dial and ISDN ...
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