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Introduction Advantages Networking Goals Networking Criteria Applications Common Terminology Used In Internet Network Topologies Types of Network LOCAL AREA NETWORK LAN Transmission Methods LAN Topologies LAN Devices Networking Basics OSI REFERENCE MODEL |
Devices commonly used in LANs include repeaters, hubs,
LAN extenders, bridges, LAN switches, and routers.
A Repeater us a physical
layer device used to interconnect the media segments of an extended network. A
repeater essentially enables a series of cable segments to be treated as a
single cable. Repeaters receive signals from one network segment and amplify,
retime, and retransmit those signals to another network segment. These actions
prevent signal deterioration caused by long cable lengths and large numbers of
connected devices. Repeaters are incapable of performing complex filtering and
other traffic processing. In addition, all electrical signals, including
electrical disturbances and other errors, are repeated and amplified. The total
number of repeaters and network segments that can be connected is limited due
to timing and other issues. Figure illustrates a repeater connecting two
network segments.
Figure: A Repeater Connects Two Networks Segments
 
Switches are another
fundamental part of many networks because they speed things up. Switches allow
different nodes (a network connection point, typically a computer) of a network
to communicate directly with one another in a smooth and efficient manner.
There are many different types of switches and
networks. Switches that provide a separate connection for each node in a
company’s internal network are called LAN switches. Essentially, a LAN switch
creates a series of instant networks that contain only the two devices
communicating with each other at that particular moment.
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LAN Devices
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