network topologies michael lunn elias patsalos
TRANSCRIPT
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Network Topologies
Michael Lunn
Elias Patsalos
James Hardiman
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Terminology• Networking – consists of computers, wiring, and other
devices, such as hubs, switches, and routers that make up the network infrastructure.
• Topology – (from the Greek word topos meaning place) is a description of any kind of locality in terms of its layout.
• There are two ways to describe a network topology.
1. Physical topology2. Logical Topology
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Client – a computer that allows a user to log onto the network and take advantages of the resources on the network.
Server – Much more powerful computer that provides centralized administration of the network and serves up the resources that are available on the network.
Terminology
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Client/Server
Client/Server network operating systems allow the network to centralize functions and applications in one or more file servers
Advantages• Centralized• Scalable• Flexible• Interoperable• Accessible
Disadvantages• Maintenance• Expense• Dependence
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Peer to Peer
Each computer acts both as a client and server.
Advantages• Less expense• Easy setup• Decentralized
Disadvantages• Security• Decentralized
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Standard Physical Topologies
Star
Ring
Mesh
Bus2223
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Bus Topology
• Characterized by a main trunk or backbone line with networked computers attached at intervals along the trunk line.
• Passive topology• Typically use coaxial cable hooked to each computer
using a T-connector.
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Bus Topology cont.
Coaxial Cable Connectors
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Star Topology
Computers on the network connect to a centralized connectivity device, usually a hub or a switch.
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Ring Topology
• Connects the LAN computers one after the other on the wire in a physical circle.
• Moves info on the wire in one direction, considered an active topology.
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Mesh Topology
• All nodes are directly connected with all other nodes.
• Best choice when fault tolerance is required.
• Very difficult to setup and maintain.
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Standard Logical Topologies
• The way in which data accesses the medium (cable) and transmits packets.
• There are only two: Ring and Bus
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Logical Topology: Ring
In the ring logical topology only one node can send information across the network at any given time. This is done by way of a ‘token’.
Each terminal receives this special packet, and if it has data to send, it will do so.
Once it has sent the data, it passes the token to the next station.
• Used for very fast networks• No collisions• Susceptible to faults
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Logical Topology: Bus
Each time a node on a network has data for another node the sending node broadcasts to the entire network.
• Stations can always transmit.• Less susceptible to breaks.• Collisions (two stations transmitting at once) have to be
dealt with.
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Selecting a TopologyNeeds:Do you need very high speeds?Will you be moving really large files?
Maintenance:Do you want something (relatively) painless?
Cost:Are you on a budget?Do you want replacement parts easily accessible?
Geography:How far is it between stations?Will you be relocating stations often?
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Thank you!
Questions?