Fichas
Networks
Fichas del conjunto (49)
- 1Dataunorganised facts
and figures - 2InformationIs data that has been
processed into a
more useful form - 3An Information System is made up of four components:Equipment
Data
Personnel
Procedures - 4Stand alone computerA computer not connected to any other device
- 5Computer NetworkTwo or more devices connected together
Device does not have to be a computer - 6(LAN)Local Area Network
A number of devices located in one geographical area
Each device is called a ‘node’ - 7Peer To Peer Networkis a simple inexpensive network in which each node shares hardware and data with all the other computers on the network
- 8Client/Server Networkis a network in which one or more computers acts as a server and the other computers on the network can request service from the server
- 9(WAN)Covers a wide geographical area
Often two LAN’s are connected together by telephone cabling - 10Intranetis an internal network within an organisation that uses internet and web technologies
Contains information only really relevant to people within an organisation - 11Advantages of NetworksAllows Communication
Share Hardware
Share data & information
Share software
Transfer funds - 12Disadvantages of networksUser Dependency
Network Management - 13Networkis a collection of computers and devices connected together vis communications devices and transmission media, allowing computers to share resources
- 14Packet Switchis when a file is broken down into hundred of packets
each packet may be sent a different way to the destination - 15802.11 ProtocolWireless
Data travels in frames
Range up to 50+ meters - 16TCP/IP Protocolis a network standard that manages the transmission of data by breaking it up into packets and transmitting the packets over the internet
- 17Ethernet ProtocolNetwork with cables
sends data in frames
fame size 1.5KB - 18ProtocolsRules followed when on a network
Each network speaks a different language
All devices on the network have to speak the same language - 19Network Interface CardIs a communication device that enables a computer that does not have in-built network capability to communicate with a network
- 20SwitchIs a device that provides a common connection point for nodes on a network
- 21Wireless Access PointIs a central communications device that allows computers and devices to transmit data wirelessly among themselves
- 22RouterIs a communication device that connects multiple networks
- 23ModemA modem is a device that converts computer digital signals into analogue signals before they are transmitted over a standard telephone lines.
- 24Network Operating SystemIs the system software that organises, controls and coordinates the activities on the local area network
- 25Identify four tasks performed by a NOSManage users
Manage file access
Manage Printers
Security - 26Unshielded Twisted-Pair Cable (UTP)Wires are twisted into pairs to reduce interference
Carry: Up to 100 metres
Rate:Between 10 & 100 Mbps - 27Fibre-Optic CableContains glass that transmits light Signals
do not suffer from interference
Reliable up to 2 kilometres
Transmits at 100 Mbps & faster - 28Broadcast RadioWi-Fi
Data travels from a sending device to a receiving device with a receiver
Carry:Up to 100 metres
Rate:1-2 Mbps to 200+ Mbps - 29Cellular RadioData travels over the mobile phone network
Carry:Up to 5kms
Rate:From 150Kbps to 2.4Mbps - 30MicrowaveRequires dishes to be set up – in high places
Requires line of sight transmission
Carry: Up to 5kms
Rate: Up to 4Mbps - 31SatelliteData travels from earth to a satellite in space & back again
Can be a lag between sending & receiving
Often only option in remote location
Distance-35000km - 32Infra-RedUses light waves and requires line-of-sight
Carry: Up to 5 metres
Rate: 2.4 Kbps to 1 Gbps - 33Accidental ThreatsHuman error
Not anyone's fault – it just happened
Examples: Delete files by accident
Send email to wrong person
Trip over power cable - 34Deliberate ThreatsSomeone causes problems on purpose
Examples:
Hackers steal data
Viruses damage hardware or software
Worms slow down a network - 35Username & PasswordsUsers are given a username
They then select their own username
Threat Stopped:
Unauthorised Access - 36FirewallsA device that sits on the internet connection
Checks all data coming in to a network
Blocks any traffic that looks suspicious
Threat Stopped:
Unauthorised Access
Hackers
Viruses - 37EncryptionScrambles data before it is sent
Stops hackers from reading data if accessed - 38Malware ProtectionMalware software scans the network for any suspicious files on your computer
e.g. Spyware, Adware, Trojan Horses, Worms and Viruses - 39Physical DesignA drawing of how the network is connected
- 40Network ManagerResponsible for the entire network
Solve network problems
Plans further improvements - 41Network TechnicianTravels around the organisation fixing problems
Maintains hardware and software - 42Help Desk SupportReceives requests for help from users
Tries to solve problem online or over the phone
If they cannot solve the problem, the problem is passed to a technician - 43Website DeveloperCreate and maintains an organisations website
- 44Smart PhoneA device that contains a phone, but can also run a range of computer applications and functions
- 45Personal Digital AssistantIt’s a device that includes personal management tools, such as calendars
- 46Netbookis a small lightweight and inexpensive laptop, suitable for general computing and internet based applications
- 47Portable Media Player (MP3 Player)Is a device that allows you to store, organize and play digital media
- 48Navigation System (GPS)Is a navigation system made up of a group of at least twenty-four satellites that communicate with a fixed or portable device mounted to your car
- 49Digital Camerais a device that allows photographs to be taken and stored digitally on a memory card
Información
- Descripción
- year 11 IT Fichas sobre Networks , creado por thomas.king el 06/05/2015.
- Creado por
- thomas.king
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