Section 17.2
Computers & Communication
17.2 Local Area Networks
A LAN is a collection of computers, peripherals and the links between them. It is
usually confines to one site building.
Networing standalone microcomputers:
- Sharing of Hardware Resources
- Shared Access to Software
- Sharing of User Information
- Ability to Communicate
This network topology involves connecting each workstation to the server
separately.
Advantages
- If one cable fails the other workstations are unaffected.
- Consistent performance even if there is a good deal of network
traffic.
- Easy to add extra workstations.
- No problems with data collisions in network cabling.
Disadvantages
17.2.2 Bus Network Topology
In this topology all devices share a single cable.
Advantages
- Easy and inexpensive to install as this topology requires less cable
than any other.
- Adding more stations is relatively easy.
Disadvantages
- Cable failure will lead to total network failure.
- Such failure is difficult to locate.
- Network performance deteriates under heavy loads.
17.2.3 Ring Network Topology
In a ring network there is no central controlling computer. Messages are passed
from computer to computer (in one direction) until they reach their destination.
Advantages
- No dependance on a central computer.
- High transmission rates are possible.
Disadvantages
- If one station breaks down the whole network fails.
