Seminar on Network Devices


  Network Devices.ppt (Size: 1.86 MB / Downloads: 1)

Functions of network devices
Separating (connecting) networks or expanding network
e.g. repeaters, hubs, bridges, routers, brouters, switches, gateways
Remote access
e.g. 56K Modems and ADSL modems

A. Expanding Network

Networks cannot be made larger by simply adding new computers and more cables
Less efficient !!
Can install components to
segment (divide) large LAN to form smaller LANs
connect LANs
Required components
Repeaters, bridges, routers, brouters, switches or gateways.

b. Bridges

Has one input and one output
Used to isolate network traffic and computers
Has the intelligent to examine incoming packet source and destination addresses
But cannot interpret higher-level information
Hence cannot filter packet according to its protocol

c. Switches

Switches operate at the Data Link layer (layer 2) of the OSI model
Can interpret address information
Switches resemble bridges and can be considered as multiport bridges
By having multiports, can better use limited bandwidth and prove more cost-effective than bridge.
Switches divide a network into several isolated channels
Packets sending from 1 channel will not go to another if not specify
Each channel has its own capacity and need not be shared with other channels.