Flashcards
Unit 6: Computer Communications and Networking
Flashcards do conjunto (54)
- 1Each device on a network is called a...Node
- 2LAN stands for....... It is confined to a .... geographical area and all hardware is owned and maintained by the organisationLocal Area Network
small - 3Advantages of LANShare expensive peripherals
Central Data Storage makes data sharing and backups easy
Easy to update - 4Disadvantages of LANProblems would affect all user
Security risk as data accessible from many places
Maintenance expensive - 5WAN stands for ..... It covers a ... geographical area. A example of a WAN is the .... They are often made up of many ..... connected together and use publicly available communication facilities.Wide Area Network
large
Internet
LAN - 6Advantage of WANBusiness can function from anywhere
- 7Each device on a network needs a NIC (....) Each NIC has a unique MAC (....) address that does not change.Network Interface Card
Media Access Control - 8Most connections between devices in a LAN use copper cable called .....UTP (Unshielded Twisted Pair)
- 9For longer distances ...... cable is usedfibre-optic
- 10A hub transmits a message to ..... other devices. It combines many devices into one segment.all
- 11Switches connect network segments or devices. It transmits a message to the ..... device not all devicesintended
- 12Wireless Access Points allow connection to a LAN without .... using standards like .....cables
WiFi - 13Routers receive data in .... and direct traffic through large networks. Small routers are used to connect homes to the ISP (.....)packets
Internet Service Provider - 14Client-Server Network is .... and the network functions ae handled by dedicated machines, and the clients can provide for their users.efficent
- 15In a peer-to-peer network all computers are.... Each computer meets its users needs as well as carrying out network functions. They are .... to set up but maintenance is more .... and security is .... They are slower due to multitaskingequal
easy
difficult
poor - 16BusComputers are attached to a backbone with terminator at each end preventing signals reflecting.
- 17AdvantagesEasy to set up
cheap - 18DisadvantagesBackbone problem brings whole network down
limited distance
data collisions slow down system - 19StarComputers connected to central switch or hub connected to a server.
- 20AdvantagesRobust
Few data collisions - 21DisadvantagesNeeds more expertise to maintain
Expensive - 22RingData passes through each node in a one way system
- 23AdvantagesNo collisions-fast
- 24DisadvantagesOne broken connection can bring down whole network
Data passes through every node, making network vulnerable to malfunctions. - 25Protocolset of rules that covers data communications
- 26TCP/IPTransmission Control Protocol/Internet Protocol
DeFacto standard for data transfer over the internet - 27HostsRemotely accessed computer systems that hold data
- 28PacketsCollections of data forming part of a message
- 29Packets contain information such as....checksum
sender/receiver address
packet number
time to live - 30Packets are sent individually and assembled at the end. This is called ....Packet Switching
- 31DNSDomain Name System
Translates URL's to IP Addresses - 32FTPFile Transfer Protocol
- 33HTTPHypertext Transfer Protocol
Webpages - 34POP3Post Office Protocol 3
Emails - 35IP AddressCan change, but is used to identify a device on the internet
4 Binary Numbers - 36MAC AddressMedia Access Control
Unique number stored in NIC to identify a device on a network
6 Hexadecimal Numbers - 37Unauthorised access can result in....Data Loss
Theft of Data
Installation of malware
Damage to systems - 38Data can also be lost by accident .....in the case of fire, malfunctions, war, terrorism, natural disasters
- 39Backups should be .... and ...... They should be .... madesecure
offsite
regularly - 40ArchivesOld data kept in case of future enquiries and for legal reasons.
- 41FailoverSoftware detects a potential disaster and transfers operations to duplicate system to avoid interruptions
- 42Disaster RecoveryA plan which covers what to do in the event of data loss.
- 43AuthenticationUsers are identified by a username and password. Permissions can be granted to each person.
- 44Important Data is oftenEncrypted
- 45Acceptable use policiesRules a user has to abide by
- 46World Wide Web makes use of the .... and is just one of the services that use the infastructure.internet
- 47ModemConverts between Analogue and Digital sigals allowing connection to the internet on phone links
- 48RouterConnect networks together
- 49DNS servers hold...infomation connecting IP Addresses to URL's
- 50URLUniform resource locator
- 51HTMLHypertext Markup Language
Text files that describe a web page - 52CSSCascading Style Sheets
files referenced by HTML in order to apply a desire set of fonts etc to a web[age - 53Lossy CompressionRemoves data from file. Remove least important details. Less Pixels
- 54Lossless CompressionRepeated detail is not stored. File easily reconstructed
Informações
- Descrição
- Computing Revision FlashCards sobre Unit 6: Computer Communications and Networking, criado por Andrew Stonehouse em 25-04-2017.
- Criado por
- Andrew Stonehouse · abr 2017
- Atualizado
- 31 mai 2017
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