Network Security

Download Applied Data Communications and Networks by W. Buchanan (auth.) PDF

By W. Buchanan (auth.)

The utilization of knowledge communications and machine networks are ever in­ creasing. it really is one of many few technological components which brings merits to many of the international locations and the peoples of the realm. with no it many industries couldn't exist. it's the target of this ebook to debate facts communications in a readable shape that scholars and pros around the globe can comprehend. up to attainable the textual content makes use of dia­ grams to demonstrate key issues. so much at the moment to be had information communications books take their view­ element from both a working laptop or computer scientists top-down strategy or from an digital engineers bottom-up method. This ebook takes a realistic ap­ proach and helps it with a theoretical history to create a textbook which are utilized by digital engineers, computing device engineers, computing device scientists and pros. It discusses lots of the present and destiny key info communications applied sciences, together with: • info Communications criteria and types; • neighborhood quarter Networks (Ethernet, Token Ring and FDDI); • Transmission keep watch over ProtocollInternet Protocol (TCPIIP); • High-level information hyperlink keep watch over (HDLC); • X.25 Packet-switching; • Asynchronous Communications (RS-232) and Modems; • Pulse Coded Modulation (PCM); • built-in electronic providers community (ISDN); • Asynchronous move Mode (ATM); • mistakes keep an eye on; • X-Windows. The chapters are ordered in a potential constitution for the presentation of the cloth and feature now not been sectioned into information communications areas.

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Sample text

For example a single laser printer in a busy office may not be able to cope with the demand. A good network copes with this by segmentation, so that printers are assigned to different areas or users. The network may also allow for re-direction of printer data if a printer was to fail, or become busy. 4 Sharing disk resources (network file servers) Many computer systems require access to a great deal of information and to run many application programs such as word processors, spreadsheets, compilers, presentation packages, computer-aided design (CAD) packages, and so on.

The presentation layer can also add data encryption for security purposes. The application layer provides network services to application programs such as file transfer and electronic mail. 10 shows an example with two interconnected networks, Network A and Network B. Network A has four nodes NI, N2, N3 and N4, and Network B has nodes N5, N6, N7 and N8. If node NI communicates with node N7 then a possible path would be via N2, N5 and N6. The data 32 Data communication models, networks and standards link layer ensures that the bits transmitted between nodes Nl and N2, nodes N2 and N5, and so on, are transmitted in a reliable way.

If it does then the source nodes knows that the data frame was received correctly, else the node is not responding. If the source node has finished Token ring 49 transmitting data then it transmits a new token, which can be used by other nodes on the ring. A distributed control protocol determines the sequence in which nodes transmit. This gives each node equal access to the ring. Token ring is well suited to networks which have large amounts of traffic and also works well with most traffic loadings.

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