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Networks and Hardware (Client-server Networks: (Pros: (• Easier to keep…
Networks and Hardware
Client-server Networks:
Made up of a server and clients. Managed by a server. The devices connected to the server are clients.
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Clients send requests to the server. The server processes the request and responds. This is a client-server relationship.
Server stores user profiles, passwords and access information.
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Peer-peer Networks:
All devices are equal, connecting directly to each other without a server.
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Cons:
• No centralised management – devices need their updates and security installed individually. Backups are more complicated.
• Copying files between devices creates duplicate files – it is easy to lose track of what is stored where and which files are up to date.
• Peer machines are less reliable, and data may be lost if one fails.
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Wireless: WiFi
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• WAP – Wireless Access Point device, basically a switch that allows a device to connect to it wirelessly.
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Computer Hardware:
Network Interface Controller – NIC, internal piece of hardware that allows a device to connect to a device. Built onto the motherboard, used for both wired and wireless connections.
Switches – connect devices to LANs. Receive data in units called frames from one device and transmit this data to the device on the network with the correct MAC address.
Routers – transmit data between networks, connected to at least two different networks. Direct data in packets to their destination. E.g. connect LANs to the internet.
Cables:
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Coaxial – single copper wires surrounded by a plastic layer for insulation and metallic shielding which provides shielding from outside interference.
100 mb per second, uses the transmission media of radio waves.
Fibre optic – transmit data as light. High performance, expensive cables. Don't suffer interference and can transmit over very large distances.
1gb per second, uses the transmission media of light.
