devices such as interconnection, the Repeaters, Hub's , the Bridge, the Switch and Router systems are capable of addressing, routing and dispatch a message when the number of stations connected to the network, or network traffic is too high. The functions of these devices in a local network are:
Repeater: is used to interconnect LAN segments in order to increase the allowable length of each section.
The symbol used to represent a repeater is shown in the figure.
Hub: is used in networks with a physical star topology. It allows you to connect multiple computers to it.
The Hub in the figure has nine ports, of which the first eight, from left, are used to connect computers, while the ninth, called the uplink, is used to connect to other hubs to expand existing networks . It allows you to connect computers via a RJ-45 connector and UTP or STP. 
The symbol used to represent a hub is shown in the figure. Bridge: is able to interconnect the segments of the same network that use different protocols at the physical level, as it has the ability to filter traffic based on destination address.
The symbol used to represent a bridge is shown in the figure.
Switch: is also known as multiport bridges, as nothing but a series of miniature bridge, so everyone can manage a single switch port. It makes the network more efficient, since it is in whole is able to connect network segments, which each device, and send the data, only the output port on the segment or device that should receive the data, adjusting the network traffic and increasing bandwidth.
The low-end switches, usually 8-port, similar devices are hubs, meaning that once inserted will not need any kind of control.
The Switch "managed" allow, through its own software to analyze traffic, monitor ports, control access and possibly lock up a few. The symbol used to represent a switch is shown in the picture above.
Router: device is a 'smart', able to interpret the logical addresses, and so it is usually used to connect networks that have methods of addressing are not compatible with each other. A router allows you to connect between their local networks with different topology. In the latter case, each network is seen as a sub in the sense that their addresses and various other network.
The symbol used to represent a router is shown in the figure. 
0 comments:
Post a Comment