Flashcards
Topic 8: Networks
Cards in this deck (19)
- 1What is a Network?A computer network is collection of computers linked by network cabling together so they can communicate with each other, if not connected to network it's called stand-alone
- 2What is LAN?Local Area Network
Computers are all in same building/site, permanently connected to each other with special cables - 3What is WAN?Computers are spread over large geographical area, not permanently connected to each other (telephone lines; satellite links; radio transmitters)
- 4Advantages of NetworksSharing resources: printers; programs; central pool of data files stored separately on server- different access rights; collaborative working
Central backup of data in one location at fixed time
Central user management audit observe in real time & software distribution
Users can communicate
Remote management - 5Disadvantages of NetworksInitial high cost
Spreading of viruses
Power failure on file server would mean no access
Technical knowledge required - 6Name three types of network securityPHYSICAL
ACCESS
DATA - 7Dangers of the InternetHackers: Firewall software; Hierarchy of passwords
Viruses: often spread by email; virus detection/eradication programs
Undesirable materials & paedophiles in chat rooms: Software to blocks sites; adult supervision; filtered service - 8InternetNetworks of networks accessible from anywhere at any time
- 9IntranetNetwork that can only be accessed from within organisation PRIVATE CLOSED INTERNET
- 10ExtranetExternal network that has restricted access to customers, suppliers as well as organisation
- 11Advantages of the InternetEasy communication with other people- email;chat;bulletin boards; blogs;video conferencing
Valuable learning resource - IT skills needed for future jobs
Enables more people to work from home - teleworking
Up-to-date info can be accessed online without waiting for publication
Saves paper if published online
Companies advertise/conduct business - 12Disadvantages of the InternetMuch of info isn't checked may be incorrect/irrelevant
Large amount of undesirable material readily available
Messages can be intercepted
Large telephone bills
Lacks of face-to-face interaction
Hackers/viruses damage computer - 13Advantages of stand-alone computersCheaper hardware/software compared to network
Less IT knowledge required
Fewer problems with viruses - 14Disadvantages of stand-alone computersTransfer of files has to be done using portable media
Hard to keep up-to-date
Harder to install software - 15Features of emailGroup sending; file attachments; voice mailboxes; address books
- 16Advantages of emailSent and received almost instantly to anywhere in world- only cost of local telephone call
Can use address books to group send to people at same time same cost as one telephone call
Attachments can be sent
Can pick up your email anywhere in world with Internet access
Environmentally friendly
Read receipt is possible - 17Disadvantages of EmailOther person needs computer with internet access
Physical items can't be sent
Too many emails- waste time opening
Security/privacy issues e.g. viruses; phishing scams/malware; cyber bullying
Junk email- block access to urgent mail
Does not allow real time 2-way conversation - 18Define FTPFile Transfer Protocol
Standard Internet protocol providing simple way of transferring files between computers using Internet. TP most commonly used to download files from server using Internet or to upload file. - 19Describe search enginesSoftware tools designed to search using logical operators/keywords for info on World Wide Web.
Keywords use to locate web page addresses.
Presented in list or index of web pages.
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- AS IT Flashcards on Topic 8: Networks, created by lauramyates3 on 26/04/2014.
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