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COMP609 - Networking Devices Assignment

   

Added on  2020-03-04

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Networking devices 1NETWORKING BY SWITCHES AND BY BRIDGES

Networking devices 2NETWORKING BY SWITCHES AND BY BRIDGESTask (a)An Ethernet switch may run out of buffers due to several reasons and in turn, drop some frames before they reach the destination node or switch. Imposing half duplex semantics on some of the switch ports and halving their data rates may not be a solution. This is because half duplex Local Area Networks (LANs) may cause devices fail to send or receive data simultaneously[ CITATION Gil98 \l 1033 ]. It would mean that we have only escalated our problem instead of solving it. The working of a half-duplex Local Area Network operates in a way that when one device sends a data frame, all the other devices connected to the switch listen to the frame and this is prone to collision. In the attempt to prevent any frame drops, we still want a condition where all devices connected can send and receive data packets simultaneously without experiencing collision which is not possible with half-duplex Local Area Network communication mode.The best solution we can have to prevent the switch from running out of buffers is increasing the Ethernet input ring buffers. The use of Virtual Output Queues is also satisfactory since the sending port will have to wait for the receiving port to have room before sending any frame[ CITATION Mar03 \l 1033 ]. This means. If there is no space in the port of receipt for long, the frames will stay in the sending port buffer. If it is full, then the port will send a signal tothe sending port it is connected to, to pause the transmission and a continue signal when there is a buffer.

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