Flashcards
networks
Flashcards do conjunto (28)
- 1What is a computer network?two or more computers connected together to share information and resources.
- 2Describe a LANa local area network.
- 3Describe a WANwide area network.
- 4What are the advantages of a computer network?Resource sharing.
- 5What are the disadvantages of a computer network?licences are likely to be cheaper than buying several standalone licences.
- 6What devices are needed to produce a LAN?Network Adapter..
Wired networks need cable
Cable Connectors.
Power Supply.
Hub/Switch/Router
Network Software - 7What is the purpose of a NIC?The NIC contains the electronic circuitry required to communicate using a wired connection.
- 8What is the purpose of a Router?Router– Routers work by sending data between networks (e.g. over the internet).
- 9What is the purpose of a switch?Switch– a switch is a device that connects nodes (networks) together.
- 10What is the purpose of a hub?a hub is similar too a switch because it does the same job, but a switch is more intelligent.
- 11What is the purpose of a WAP?this is a hardware device or a network, on a local area network that allows wireless capable devices and wired networks to connect through a wireless things, such as; Wi-Fi or Bluetooth.
- 12What is the difference between a Hub and a Switch?they both connects nodes together, but the switch is more intelligent than the hub because a hub is sent to all nodes
across the whole of the
network, but a switch is sent to all nodes
across the whole of the
network. - 13What is the Internet?its a huge network of all computers joined/ connected together.
- 14what does the term www mean?world wide web
- 15What is the purpose of a Modem?it converts the digital signals produced by your computer, into analog signals that can be sent to a phonephone. it connects to ISP.
- 16What is the purpose of an ISP?they use fibre-optics to provide internet access to their customers.
- 17What is an IP address?a unique string of numbers separated by full stops that identifies each computer using the internet.
- 18What does HTTP stand for?hyper text transfer protocol
- 19What is a URL?the address of a world wide web page
- 20How is a URL constructed?a URL can be thought as 'the address' of a web page and is sometimes referred to informally as a web address. a URL is made up of several parts.
- 21What are the three different network topologies?star, bus, ring .
- 22What are the advantages / disadvantages of a Star topology?Advantages: Fastest performance
Easy to install and to expand with extra nodes and A failure in the minor cables will only affect one node.
disadvantages: Uses the most cable which makes it more expensive,
An extra hub or switch further increases the cost. - 23What are the advantages / disadvantages of a Ring topology?Advantages: One-way system so not affected by heavy traffic. Disadvantages:
Cable failure anywhere will affect the whole network, need to ‘break’ the ring in order to add a new node, all nodes must be switched on - 24What are the advantages / disadvantages of a Bus topology?Advantages: The simplest and cheapest to install and extend, Failure of one node does not affect the rest of the bus network
Disadvantages: If the main bus cable fails then the whole network will fail, Performance of the network slows down rapidly with more nodes or heavy network traffic - 25List examples of data that need to be kept securebanking deatails, passwords.
- 26What is HTTPS and what is it used for?it defines how messages formatted and transmitted, and what actions web servers and browsers should take in response to various comments.
- 27What is encryption?the process of converting data
- 28What is decryption?the process of transforming data
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- FlashCards sobre networks, criado por Honey Lee em 04-12-2017.
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- Honey Lee
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