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Networks - Coggle Diagram
Networks
Packet Switch
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Contents of a packet
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Packet ID is needed so that, afterwards, data from multiple packets can be arranged into the correct order
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Protocol is an indentation in which protocol (HTTP, FTP, SMPT etc) has been to form the packet.
Data is the reason a packet is being sent in the first place. Eventually, all packet components are discarded apart from the data itself.
Checksum is a technique that verifies that the data that was sent matches the data that was received
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Packet switching is less susceptible to interception and is more reliable because if a route fails then the packet can be use an alternate route. Missing packets are resent when needed.
Bus
The computers (nodes) are connected to a single cable
on which data can be sent, called the bus.
The bus has terminators on each end, which are needed to close each end of the cable.
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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.
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LAN and WAN
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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.
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.
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Network Topologies
A network topology is the layout of computer systems on a network. There are a number of different network topologies. Some common network topologies include: Bus, Ring, Star and Mesh
Mesh - 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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Ring - Each node connects to exactly two other nodes, providing a single pathway for signals through each node.
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