IDS_Exam3 - IDSExam3StudyGuide CHAPTER5

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IDS Exam 3 Study Guide CHAPTER 5 Computer Network: a system that connects computers via communications media so that  data can be transmitted among them Types of Computer Networks LAN (local area network): connects 2 or more devices in a limited geographical region,  usually within the same building, so that every device on the network has the potential to  communicate with every other device Consists of: A file server: repository of various software and data files A # of client machines, called  nodes Wired or wireless communications media that connect the devices on a network Network interface cards, which are special adapters that link an individual device  to the communications medium. Specifies rate of data transmission, size of the  message units, the addressing info. Attached to each message and the network  topology. Network Topologies: Star: all network nodes attach to a single computer, typically the file  server. Advantages: easy to add to a node, provides fast  communications. Disadvantages: if central computer is lost, so is the 
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network; with too many nodes central computer performance is degraded Bus: all network nodes connect to a bus, which is a single communications channel, such as a twisted pair, coaxial cable or fiber optic cable. Advantages: easy to add node. Disadvantages: if bus is lost, so is network; too many nodes will overload the bus Twisted pair: most common type of cable, also known as telephone wire. Has various categories: 3=used for voice, 5&6=used today for voice and data Ring: network nodes are connected to adjacent nodes to form a closed loop. Advantages: can cover larger distances than other topologies.
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difficult to add node.  PAN (Personal Area Network): a computer network used for communication among  computer devices MAN (Metropolitan Area Network): large computer network usually spanning a city or  campus by connecting several LANs. Can span up to 50 Km WAN (wide area network): networks that cover large geographic areas. Typically  connect multiple LANs. Network Processing Types: Distributed Processing: divides processing work among two or more computers, enables  computers in different locations to communicate with one another via  telecommunications links P2P(peer to peer): type of client/server distributed processing where each computer  acts  as both a client and a server Router: routes messages through several connected LANS or to a wide area network Bandwidth: the amount of information that can be transmitted over a communications  channel in a unit of time, typically seconds. Protocols: a set of rules governing communication within and between computing end-points
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IDS_Exam3 - IDSExam3StudyGuide CHAPTER5

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