Networks
- Created by: Aoifeowens
- Created on: 29-02-20 20:59
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- Networks
- Computer networks
- LAN / local area network
- A computer network where computers are geographically close together
- WAN/ wide area network
- A network computers are geographically far apart.
- World Wide Web~ Is an application that uses the internet
- Uniform resource locator ~ the address that can be entered into the address bar to locate a website
- Each website consists of a number of websites developed using a web authorising language such as HTML
- Hypertext markup language ~ the language used to define the structure of websites; it is often combined with CSS and JavaScript to create hypermedia applications presented to users via browser software for the World Wide Web
- To allow the websites to be accessed using the internet , they require a communication protocol known as http ( hypertext transfer protocol)
- The intranet is similar to the internet, but is managed by an organisation and only authorised users, with a username and password can access the content
- The internet of things (LoT)describes the impact of the internet of how we live and work.
- LAN / local area network
- Network communications technology
- Wi-Fi
- WiFi connections use radio waves and a wireless router
- Devices with a built in wireless adapter can connect to a WiFi network
- Advantages of using a WiFi network is that there is no need for cabling.
- Disadvantage is the limited distance on how far the signal can travel and variations on the signal strength depending on proximity to a wireless router.
- Bluetooth
- Uses short-range wireless technology to connect two devices together
- For the devices to begin ransferring data between each other they have to be synchronised or paired
- Since the devices communicate directly with each other there is no need to have a router
- Optical fibre
- Consists of a bundle of glass strands, each strand carries one data signal, which means many data signals can be sent at one time in the bundle.
- Data is transmitted as pluses of light
- Advantages of using glass is that signals (or data) cannot be interfered - it is very secure
- Disadvantage is that it requires the use of repeaters for data to travel over large distances
- Mobile communication technology
- 4G mobile-phone technology is capable of high speed data access access and high-quality video streaming using wireless technology on a global scale
- Wi-Fi
- Network resources
- Network interface cards
- ~ A NIC is an electronic circuit board built into a computer to allow it to be connected to a network ~it allows each computer to communicatewith the file server and the other computers on the network ~it has a port to allow a network cable to be attached ~portable computers such as laptops are supplied with a strand with a standard wireless network interface card. (WNIC)
- Network cables
- ~ a network cable physically connects to a computer network ~generally cables are made of copper and data travels along the cables to and from the file server.
- Switch
- ~A switch allows a large number of computers on a network to be connected ~it checks the destination of data it receives and ensures it is forwarded to the intended computer.
- Router
- ~This is a hardware device that connects a number of networks together by either able or wireless. ~it examines data as it passes, and forwards the data using the most appropriate route to its destination.
- Network interface cards
- Network topologies
- Bus network
- In this network computers are connected to a main cable known as a back bone
- Data can travel in both directions along the backbone.
- To add a new computer to a bus network its cable is attached to the backbone
- Star network
- Computers are connected by there own cable to a file server
- All data on the network must pass through the file server
- An additional computer to be added by attaching it (using its own cable ) to the file server.
- Ring network
- Each computer is directly connected to two other adjacent computers to for a ring
- All data travels in on direction by visiting each computer in turn until it reaches its intended destination.
- To add a new computer to the network the cable between two existing computers has to be broken and each part of the broken cable attached to the new computers
- Advantages and disadvantages of networking
- advantages = users can save their work on the file server and retrieve it on any other computer within the network ~expensive hardware devices .e.g. laser printers can share by all computers on the network
- Installing software and updates once onto the file server allows all computers to access software quickly
- Disadvantages = a software virus can quickly spend across the network, affecting all user data and the software ~when a large number of users are logged onto a network ,access speeds can be slow.
- The setup costs can be expensive as additional hardware e,.g. File servers, network interface cards, switches and routers, has to be purchased.
- advantages = users can save their work on the file server and retrieve it on any other computer within the network ~expensive hardware devices .e.g. laser printers can share by all computers on the network
- Bus network
- Computer networks
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