|
|
This is only a preview of the paper
Click here to register and get the full text.
Existing members click here to login
|
|
|
UNIT 23: Investigating Communications and Networks Hand in date: December 20th Task 1 Bus Topology Each pc has its own address. Data is transferred by broadcast. Every machine reads the broadcast but only accepts the data that is addressed to itself. Ethernet (The technology used in broadcast) Involves the CSMA/CB approach to controlling data on the segment (cable). CARRIER SENSE MULTIPLE ACCESS/ COLLISION DETECTION. A maximum of 100 nodes should be used on a bus TOPOLOGY as traffic affects performance it runs best at 50% of its capacity. This topology is fairly old but still in use today. There is just the extra wire on the end. This is by far the cheapest way of connecting computers. Bus networks are good for small networks and a fairly cheap. An advantage of a bus topology is the cheapness of the equipment. The ease of connecting the computers together and the ease of expansion. It is easy to add extra machines because there is no need to stop all the machines. Also if one of the computers fails on the network the whole network does not fail. Disadvantages in this topology: If a fault occurs on the cable then faultfinding is had especially on a large network. Also the more machines that are added the slower the network gets. Equipment needed: Coax Cable: Coaxial Cable Connector (BNC Connector): Network Card: Terminator: Ring Topology The ring topology is the second simplest network. A ring connects each workstation or peripheral. The data is transferred in tokens and only flow in one direction. However, like all networks, the ring network suffers from some deficiencies. The primary problem is the use of a single channel to tie together all the nodes in the network. If a channel between two nodes fails, then the entire network is lost. To alleviate this problem, recently companies install 2 ring networks so if one fails the other ring can take over. Advantages 1. Growth of network doesn’t affect performance much 2. Allows lots of computers to be connected 3. If one workstation fails it doesn’t affect the network Disadvantages · If there is a break in the cable then whole network fails · Complex · Expensive Equipment Needed: Twisted Pair Cable: Network Card: Star Topology All devices are connected to a central hub.
Approximate Word count = 1492
Approximate Pages = 6
(250 words per page double spaced)
|
|
|
|
|
|