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Understanding Basic Network

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Submitted By djanickz
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Networking Basics
B. Konkoth

Lesson 1 - Understanding Basic Network Structure
A network consists of 2 or more computers connected together, and they can communicate and share resources (e.g. information)
Why Networking?
Sharing information — data communication
Sharing hardware or software - print document
Centralize administration and support - Internet-based, so everyone can access the same administrative or support application from their PCs
How many kinds of Networks? Depending on one’s perspective, we can classify networks in different ways Based on transmission media: Wired (UTP, coaxial cables, fiber-optic cables) and Wireless Based on network size: LAN and WAN (and MAN) Based on management method: Peer-to-peer and Client/Server Based on topology (connectivity): Bus, Star, Ring …
Topologies
There are different topologies that make up computer networks. Topology is the physical layout of computers, cables, and other components on a network. Many networks are a combination of the various topologies that we will look at:
· Bus
· Star
· Mesh
· Ring
Bus Topologies
A bus topology uses one cable to connect multiple computers. The cable is also called a trunk, a backbone, and a segment. Most of the time, as seen in Figure below, T-connectors are used to connect to the cabled segment. They are called T-connectors because they are shaped like the letter T. You will commonly see coaxial cable used in bus topologies.
[pic]
In a bus topology, all computers are connected on one linear cable.
Another key component of a bus topology is the need for termination. To prevent packets from bouncing up and down the cable, devices called terminators must be attached to both ends of the cable. A terminator absorbs an electronic signal and clears the cable so that other computers can send packets on the

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