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INSY 3303 -- Topic_4 => Devices for Connecting Networks

INSY 3303 -- Topic_4 => Devices for Connecting...

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Topic #4 – Devices for Connecting Networks Objectives Describe how LAN network transmission equipment works, including repeaters, MAUs, hubs, bridges, routers, brouters, switches, and gateways Describe how WAN network equipment works, including modems, ISDN adapters, cable modems, DSL modems and routers, access servers, and remote routers Design a router-based network LAN Transmission Devices Uses of LAN transmission equipment Connecting devices on a single network Creating and linking multiple networks or subnetworks Setting up some enterprise networks Connecting devices that will be discussed Repeaters, MAUs, hubs, bridges, routers, brouters, switches, gateways Repeater Connects two or more cable segments Retransmits incoming signal to all other segments Cable segment is run within IEEE specifications Example: Ethernet segment in star-bus network Performs four Physical layer functions Filter out signal disturbance caused by EMI and RFI Amplify and reshape incoming signal Retime the signal (in Ethernet applications) Reproduce the signal on all cable runs Uses of repeaters Extend cable segments Increase number of nodes beyond segment Increases the possibility of collisions Can partition network segments Sense network problem and shut down segment Connect to components in other network devices Amplify and retime signals Connect segments using different media Computer Networks & Distributed 
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Increase communication distance of T-carrier lines Collision domain: segments where collisions occur Caused by two or more nodes transmitting at once Reduce number of repeaters to reduce collision domain Two kinds of repeaters Class I: only one can be used between two end nodes Class II: no more than two between two end nodes Multiple repeater ports enable several types of cable connections Example: inbound to fiber-optic, outbound to thicknet Partitioning: detecting and closing down bad segment Examples: missing terminator or broken cable Nodes cannot communicate in partitioned segment Segment must be reset at repeater after problem fixed Multistation Access Unit Multistation access unit (MAU or MSAU) Central hub on a token ring network May have intelligence built-in to detect problems Smart multistation access unit (SMAU) Tasks performed by MAU Connect nodes in a logical ring upon a physical star Move the token and frames around the ring Amplify data signals Expand token ring network by daisy-chain connections Provide for orderly movement of data Shut down ports to malfunctioning nodes Functions at OSI Physical and Data Link layers New MAUs have 16 ports for connecting nodes Lobe cables connect nodes to MAU Two types of hubs Passive: simply passes signal from node to node Active: regenerates, retimes, and amplifies the signal
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INSY 3303 -- Topic_4 => Devices for Connecting...

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