5CSE3213_02_PacketSwitchingW2012

5CSE3213_02_PacketSwitchingW2012 - diminishing capacity if...

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21 one long cable, so-called backbone , links all devices in the network – similar to single-line mainframe architecture each workstation connects to backbone through Network Interface Card (NIC); each NIC has globally unique address data frames are broadcast into coaxial cable receive : NIC listens to medium for frames with its address send : NIC listens to medium for presence of ongoing transmission – if no transmission is found, send frame collision : if frame collides with somebody else’s frame, abort transmission and retry later Local Area Networks (cont.) Bus Topology (Ethernet)
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22 The Internet (cont.) Network Card from Wikipedia …
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23
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24 Local Area Networks (cont.) advantages : simple & inexpensive installation disadvantages : 1) backbone = single point of failure 2) collisions
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Unformatted text preview: diminishing capacity if two or more devices transmit simultaneously their signals will interfere Bus Topology (Ethernet) 25 Local Area Networks (cont.) Ring Topology each device has a dedicated point-to-point connection only with the two devices on either side of it a small frame token circulates around the ring; only the station that possesses the token is allowed to transmit at any given time signal is passed along the ring in one direction, from device to device, until it reaches its destination advantages : fairness in access / effective use of bandwidth token-passing provides each station with a turn to transmit disadvantages : entire network will fail if there is a failure in any transmission link or in the mechanism that relays the token...
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This note was uploaded on 02/14/2012 for the course CSE 3213 taught by Professor A during the Winter '10 term at York University.

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5CSE3213_02_PacketSwitchingW2012 - diminishing capacity if...

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