1-02、试简述分组交换的要点。（1-02 and try to outline the main points of packet switching.）.docVIP

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1-02、试简述分组交换的要点。（1-02 and try to outline the main points of packet switching.）.doc

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1-02、试简述分组交换的要点。（1-02 and try to outline the main points of packet switching.）

1-02、试简述分组交换的要点。（1-02 and try to outline the main points of packet switching.） 1-02, the test points of packet switching. Answer: in the packet switching network, using store and forward mode, the data in the form of a packet transmission short. If a source station has a long message to send, the message will be divided into a series of packets. Each packet contains user data plus part of the control information. Control information should include at least the packet to the destination network in order to make the routing information required. Each node in the path of the packet is received, the short time memory, and then transmitted to the next node. The main advantage of packet switched networks: efficient. The flexible. The rapid. The reliable. Disadvantages: packet forwarding in due to queuing and caused some delay; packet must carry control information and generate additional overhead; 1-03, from the aspects of comparison circuit switching, packet switching and packet switching, the main advantages and disadvantages. Answer: (1): circuit switching in communication before to build a physical channel exclusive by both sides in the communication between the two sides. Advantages: data transmission delay is very small. Real-time. There is no reordering. The control is relatively simple. Disadvantages: the average circuit switched connection time. Low channel utilization. (2): packet switched packet switching uses store and forward transmission, but will be a long message first divided into several short packet, then the packet (with source and destination address and number information) sent out one by one. Advantages: accelerated data transmission in the network. Simplify storage management. The error probability and reduce the amount of data retransmission. There are still shortcomings: store and forward delay. The increase of processing time, the control complexity and delay increases. 1-06, try to compare the structure of TCP/IP and OSI. Discuss the similariti