SolStd18 - CHAPTER 18 Virtual Circuit Switching: Frame...

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1 CHAPTER 18 Virtual Circuit Switching: Frame Relay and ATM Solutions to Odd-Numbered Review Questions and Exercises Review Questions 1. Frame Relay does not use flow or error control , which means it does not use the sliding window protocol. Therefore, there is no need for sequence numbers . 3. T-lines provide point-to-point connections, not many-to-many. In order to connect several LANs together using T-lines, we need a mesh with many lines. Using Frame Relay we need only one line for each LAN to get connected to the Frame Relay network. 5. Frame Relay does not define a specific protocol for the physical layer. Any proto- col recognized by ANSI is acceptable. 7. A UNI (user network interface) connects a user access device to a switch inside the ATM network, while an NNI (network to network interface) connects two switches or two ATM networks. 9. An ATM virtual connection is defined by two numbers: a virtual path identifier (VPI) and a virtual circuit identifier (VCI). 11.
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SolStd18 - CHAPTER 18 Virtual Circuit Switching: Frame...

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