04-05-2012, 11:13 AM
Network Design
lesson03networkdesign.ppt (Size: 396 KB / Downloads: 74)
Objectives
Define channel access method.
Give the advantages and disadvantages of contention, polling, token passing, and demand priority channel access methods.
Topologies
Physical layout of network devices
Four types: mesh, bus, ring, and star
Mesh Topology
It is also called a point-to-point topology.
Each device is connected directly to all other network devices.
It provides fault tolerance.
It is only found in wide area networks.
Bus Topology
It is a multipoint topology.
Each device shares the connection.
The bus has one starting and one ending point.
Packets stop at each device on the network.
Only one device at a time can send.
Summary
Topology refers to the physical layout of the network devices and cabling and how all the components communicate with each other. Computer network topology refers to how the computer network is arranged. There are four basic types of computer network topologies: mesh, bus, ring, and star.
A mesh topology is also called a point-to-point topology. Each device is connected directly to all other devices on the network. A mesh topology is sometimes used in a wide area network (WAN) setting to ensure that all the sites continue to transmit in the event of a cable failure or another similar problem. Mesh topologies are rarely used in a LAN.