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Sol18 - CHAPTER 18 Virtual Circuit Switching Frame Relay...

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1 CHAPTER 18 Virtual Circuit Switching: Frame Relay and ATM Solutions to 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 . 2. DLCIs are unique only for a particular interface. A switch assigns a DCLI to each virtual connection in an interface. This way two different connections belonging to two different interfaces may have the same DLCI. 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. 4. In a PVC , two end systems are connected permanently through a virtual connec- tion. In a SVC , a virtual circuit needs to be established each time an end system wants to be connected with another end system. 5. Frame Relay does not define a specific protocol for the physical layer. Any proto- col recognized by ANSI is acceptable. 6. If data packets are different sizes there might be variable delays in delivery. 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. 8. A TP (transmission path) is the physical connection between a user and a switch or between two switches. It is divided into several VPs (virtual paths), which provide a connection or a set of connections between two switches. VPs in turn consist of several VCs (virtual circuits) that logically connect two points together. 9. An ATM virtual connection is defined by two numbers: a virtual path identifier (VPI) and a virtual circuit identifier (VCI).
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