Communication Networks: Fundamental Concepts and Key by Alberto Leon-Garcia, Indra Widjaja

By Alberto Leon-Garcia, Indra Widjaja

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This overhead reduces the amount of transmission capacity available to transfer user information. On the one hand, because connectionless packet switching avoids the call setup delay of circuit switching, the former does not need to keep any state information on connections. On the other hand, additional processing is required to carry out the routing decision that has to be made for every packet. Connectionless packet switching also requires the computers at the edge of the network to deal with the effects of the unreliable nature of packet transfer.

Additional framing information is usually required to allow the demultiplexer to delineate the beginning and end of each message. The messages from the various terminals are collected by the concentrator, ordered into a queue, and transmitted one at a time over the communication line to the host computer. Note that messages may be lost if a surge of message arrivals occurs without suf®cient buffers to store the arrivals in the multiplexer. The host computer sorts out the messages from each terminal and carries out the necessary processing.

The user clicks on a link to indicate which document is to be retrieved. 2. The browser must determine the address that contains the document. To do so, the browser sends a query to its local name server. 3. Once the address is known, the browser establishes a connection to the specified machine. For the connection to be successful, the specified machine must be ready to accept connections. 4. The browser runs a client version of HTTP, which issues a request specifying both the name of the document and the possible document formats it can handle.

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