Lan switching
From Mycomputer Notes
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Poperties of half duplex | Poperties of half duplex | ||
- Only one host can transmit at a time becayse the NIC needs to listeen for collisions. | - Only one host can transmit at a time becayse the NIC needs to listeen for collisions. | ||
Revision as of 23:38, 13 March 2006
Poperties of half duplex
- Only one host can transmit at a time becayse the NIC needs to listeen for collisions.
The NIC provides several circuit.ost important are:
- received (RX)
- transmit (TX)
- Collision Detection
- Banwith usage = 50% to 60%
CSMA/CD
The first device to detect the collision will generate a jam signal (colliding devices continue to transmit so that all devices will hear the collision)
- Network Congestions:
- Relieving congestion requires
- Increasing the amount of bandwidth and/or
- Using available bandwidth more efficiently
Network Latency
- Network Latency ;
Represenet the itime it takes a fram to travel from is source device to its final destination onthe network. Latency can also de described as the delauy between the time a device request access to a network and the time it is granted [ermission to transmit.
- Trasnmission time;
It is the time necessary to move a packet from the data link layer to the physical layer.
- Bridge stores the entire frame before it fowards it. (store-and-forward)
- Symmetric switching
- provides switched connections between ports with the same bandwidth (10/10 Mbps or 100/100 Mbps).(can cause bottlenecks as users try to access servers on other segments)
