Networks
- Created by: Epic Al
- Created on: 02-07-22 10:15
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- Networks
- LAN
- A LAN is a network in small areas such as a school, office or building. It exists within a small geographical area
- WAN
- Wide area networks connect separate LAN’s over a large geographical area to form a network of network
- The internet
- No single organisation owns the internet it is a network of networks – some privately owned, some public
- Every internet-connected device is assigned an IP address
- IPv4 – 1970s 32 bit, enough for 4 billion devices?
- IPv6 – 128 bit, enough for 340 trillion trillion unique IDs?
- Routers and web servers are permanently connected to the internet and so will have static IP addresses
- A domain name is a human friendly form of an IP address
- URLs are the complete web address of a particular web page, image or other resource
- Wired vs Wireless
- Wired
- Copper
- up to 100m
- up to 10Gbps
- susceptible to electrical interferance
- Used to connect devices on a LAN
- Fibre Optic
- Up to 80km
- up to 100 Gbps
- immune to electrical interference
- used for long distance data traffic
- Copper
- Wireless
- 100m max
- WIFI, Bluetooth, Zigbee, RFID, NFC
- generally low power consumption
- Wired
- network speeds
- formula for length of time it takes for a file to reach its destination
- Time(secs) = file size(bits) / data transfer rate(bps)
- Topologies
- Star
- each computer or client is connected individually to a central point or node
- Mesh
- Each computer is connected to at least 1 other computer
- bus
- each node is connected to a main cable called a bus
- Star
- LAN
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