Computer communications and networking

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  • Created by: becky.65
  • Created on: 31-05-16 14:37
What are some advantages of networking stand-alone computers into a local area network?
Central data storage makes data sharing possible and makes backups easier to do, computer use can be easily monitored and users can communicate
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What hardware is needed to connect stand-alone computers into a LAN?
Network interface controllers/cards, cables, hubs, switches and routers
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What are network interface controllers/cards?
Every NIC has a MAC address stored in ROM and this allows each node on a network to be identified and it generates and receives suitable electrical signals
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What are hubs?
Hardware devices that connect many network devices together, making them into a single network segment
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What are switches?
They connect network segments or devices. They can also act as bridges which connect more than one network
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What are routers?
They allow connection to a LAN without the need for physical cables. They receive data in the form packets and forwards them to their destination which is often another router
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List three network topologies:
Bus, star, ring
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What is a protocol?
A set of rules that covers data communications
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What are packets?
Collections of data forming part of a message that is constructed according to the rules laid down by the appropriate protocol
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What fields do packets contain?
Protocol, checksum, total length, sender's address, receiver's address, time to live, packet number and data
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What is an IP address?
It is a 32-bit number that is the address for the data packet being delivered
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What is a MAC address?
It is given as six pairs of hexadecimal numbers that can be used to identify a device on a network
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What is the internet?
It is a means of connecting millions of computers and computer networks across the world
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What is the world wide web?
One of the facilities that makes use of the internet. It consists of billions of pages written in HTML
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What are modems used for?
It converts phone links, which are analogue to digital signals, which computers use and it allows connect to the internet on the POTS
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What is the DNS?
The Domain Name System is a protocol that connects IP addresses to user friendly names
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What is HTML used for?
Hypertext Markup Language is a way of using text files in order to describe a web page. HTML uses tags to instruct a browser how to interpret and display items on a web page.
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What is lossy compression?
It works by removing some of the data from the file and this data cannot be recovered
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What is lossless compression?
It does not store repeated detail but it allows the original file to be reconstructed exactly.
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Other cards in this set

Card 2

Front

What hardware is needed to connect stand-alone computers into a LAN?

Back

Network interface controllers/cards, cables, hubs, switches and routers

Card 3

Front

What are network interface controllers/cards?

Back

Preview of the front of card 3

Card 4

Front

What are hubs?

Back

Preview of the front of card 4

Card 5

Front

What are switches?

Back

Preview of the front of card 5
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