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Unit 3 - Networks - Coggle Diagram
Unit 3 - Networks
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Network Topologies
Bus
The computers (nodes) are connected to a single cable on which data can be sent, called the bus
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As the packets arrive at each computer system, it checks the destination address contained in the packet to see if it matches its own.
If the address does not match, the computer system ignores the packet. If the address of the computer system matches that contained in the packet, it processes the data.
Ring
Each node connects to exactly two other nodes, providing a single pathway for signals through each node.
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Advantages
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The transmission of data is simple as packets travel in one direction only, so no collisions.
Disadvantages
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Because nodes are wired together, to add another you must shut down the network
If any of the computer systems fail, the ring is broken and data cannot be transmitted efficiently
Star
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Disadvantages
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Extra hardware required, such as a hub
Mesh
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Each node relays data for the mesh network. All mesh nodes cooperate in the distribution of data in the network.
This is very reliable as it can 'self-heal' by reconfiguring around broken paths. This network is complex, expensive and difficult to set up. A large part of the network may be redundant
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Disadvantages
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Initial cost of servers, communication devices, etc. can be expensive
If the server is down, all workstations on the network are affected
LAN and WAN
A LAN is a network in which the computer systems are all located relatively close to each other, for example, in the same building or on the same site, such as a school or a work place
A WAN is a network in which the computers systems are all located distantly from each other, for example, in different buildings all over the country or in different countries. The Internet is an example of a WAN. Many LANs could be linked using a WAN
