15-LANOverview

15-LANOverview - William Stallings Data and Computer...

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William Stallings Data and Computer Communications 8 th Edition Chapter 15 Local Area Network Overview
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LAN Applications (1) Personal computer LANs Low cost Limited data rate Back end networks Interconnecting large systems (mainframes and large  storage devices) High data rate High speed interface Distributed access  MAC technique Limited distance Limited number of devices
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LAN Applications (2) Storage Area Networks Separate network handling storage needs Detaches storage tasks from specific servers Shared storage facility across high-speed network Hard disks, tape libraries, CD arrays Improved client-server storage access Direct storage to storage communication for backup High speed office networks Desktop image processing High capacity local storage Backbone LANs Interconnect low speed local LANs Reliability Capacity Cost
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Storage Area Networks
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LAN Architecture Topologies Transmission medium Layout Medium access control
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Topologies Tree Bus Special case of tree One trunk, no branches Ring Star
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LAN Topologies
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Bus and Tree Multipoint medium Transmission propagates throughout medium  Heard by all stations Need to identify target station Each station has unique address Full duplex connection between station and tap Allows for transmission and reception Need to regulate transmission To avoid collisions To avoid hogging Data in small blocks - frames Terminator absorbs frames at end of medium
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Frame Transmission on Bus LAN
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Ring Topology Repeaters joined by point to point links in closed  loop Receive data on one link and retransmit on another Links unidirectional Stations attach to repeaters Data in frames Circulate past all stations Destination recognizes address and copies frame Frame circulates back to source where it is removed Media access control determines when station  can insert frame
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Frame Transmission Ring LAN
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Star Topology Each station connected directly to central node Usually via two point to point links Central node can broadcast Physical star, logical bus Only one station can transmit at a time Central node can act as frame switch
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Choice of Topology Reliability Expandability Performance Needs considering in context of: Medium Wiring layout Access control
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Bus LAN Transmission Media (1) Twisted pair Early LANs used voice grade cable Didn’t scale for fast LANs Not used in bus LANs now Baseband coaxial cable Uses digital signalling Original Ethernet
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Bus LAN Transmission Media (2) Broadband coaxial cable
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This note was uploaded on 02/10/2012 for the course CSC 411 taught by Professor Simmons during the Spring '08 term at S. Alabama.

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15-LANOverview - William Stallings Data and Computer...

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