TAILIEUCHUNG - Networking: A Beginner’s Guide Fifth Edition- P18

Networking: A Beginner’s Guide Fifth Edition- P18:I have run into many people over the years who have gained good even impressive working knowledge of PCs, operating systems, applications, and common problems and solutions. Many of these people are wizards with desktop computers | Chapter 6 Understanding Network Hardware 67 Putting together all the necessary pieces in the proper way is the art of network design. Chapter 15 discusses important aspects of assembling these devices so they work together optimally but first you need to know what they are and what they can do. The following sections discuss these essential network devices. Repeaters A repeater is a device that extends the distance of a particular network run. It takes a weak network signal in on one side boosts the signal and then sends it out its other side. You most often see repeaters on Thin Ethernet networks but they are available for virtually any network connection. For instance if you need to run a 100Base-T Cat-5 cable longer than 100 meters 328 feet a repeater enables you to double that distance. Repeaters operate at the physical layer of the OSI networking model. They do not have the intelligence to understand the signals they are transmitting. Repeaters merely amplify the signal coming in either side and repeat it through their other side. Remember that they also amplify any noise on the cable Repeaters are used to connect only the same type of media such as 10Base-2 Thin Ethernet to 10Base-2 Thin Ethernet or Token Ring twisted-pair to Token Ring twisted-pair. In practice repeaters are usually used with 10Base-2 networks Thin Ethernet which are discussed in Chapter 4. Repeaters do have a small amount of intelligence that can be useful. They can separate one of their connections from the other when there is a problem. For example consider two segments of Thin Ethernet that are connected using a repeater. If one of those segments is broken the repeater allows the good segment to continue working within itself. Users on the good segment will be unable to connect to resources on the broken segment but they can still use the good segment without trouble. But remember that this capability does you little good if your servers are on the broken segment and your workstations .

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