Chapter 13
1. C. The LMI manages the link between the DTE and the switch, including noticing when a virtual circuit (VC) comes up or goes down.
2. A and D. The DTE usually sits at the customer site, and the DCE sits at the service provider site. Frame Relay switches send LMI messages to DTEs (usually routers) to signal VC status. A Frame Relay frame does not have a source and destination DLCI, but instead a single DLCI field.
3. A. The DLCI in the frame relay header acts as an address, identifying the PVC over which the frame flows.
4. C. The DLCI addresses a VC, not a router. The DLCI value in the frame as it crosses the local link represents that VC on that link. Because the question refers to a frame crossing the access link connected to ...
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