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26 Cards in this Set

  • Front
  • Back
A Network
A collection of computers and devices connected together via communications devices and transmission media, allowing computers to share resources.
Network Advantages and Disadvantages
Advantages- Sharing Hardware, Sharing Data and information, transferring funds etc.

Disadvantages- User dependence, network management, viruses, privacy issues etc.
Local Area Network
(LAN)
A group of computers connected by a neighbouring geographic area that enables users to share information and resources.
Wide Area Network
(WAN)
WAN's cover a large geographical area such as cities, countries even the world. WAN's can be one large network or two or more LAN's together.
A Peer- to Peer Network
A simple inexpensive network in which each node shares hardware and data with all the other nodes on the network. Connects fewer than 10 computers.
Internet Peer-to-Peer
Allows users with the use of internet to connect to another ‘peers’ hard disks and exchange files.
Client/Server Network
A network in which one or more computers acts as a server and the other computers on the network can request services from the server.
A Bus Topology
A bus network is connected by a single central cable in which all other devices are connected to.
Bus Topology Advantages and Disadvantages
Advantages- Easy to set up, failure of one device does not affect other devices, cheap to install.

Disadvantages- Completely dependent on bus cable, difficult to detect and troubleshoot faults, low security.
A Star Topology
Consists of multiple nodes connected to a central hub forming a star.
Star Topology Advantages and Disadvantages
Advantages- Easy to install/maintain, devices can be added with little or no disruption to the network.

Disadvantages- Network reliant on hub, lots of cabling, hub failure= network failure.
Ethernet
A standard communications protocol embedded in software and hardware devices that allows computers to operate a LAN.
TCP/IP
Transmission control protocol/ Internet protocol.
Manages the transmission of data by breaking it up into packets and transmitting the packets over the internet.
802.11
Developed to specify how two wireless computers or devices communicate via radio waves with each other.
Wireless Application Protocol
Allows wireless mobile devices to access the internet and its services, such as email.
Modems
Modulator-Demodulator.
Coverts analogue signals to digital vice versa.
Network Interface Cards
(NIC)
Allows stand alone computers to connect to a network. Usually in-built into motherboard.
Wireless Access point
A central communications device that allows computers and devices to to transmit data wirelessly among themselves.
Switches
A device which provides a common connection point for nodes on a network.
Routers
A communications device that connects multiple networks.
Coaxial Cables
Used as a transmission line for radio frequencies. They carry signals great distances and carry internet connections via Ethernet cables.
Fiber-optic Cable
Used for TV and Computers. Transmits light faster than any other cable technology.
Accidental Security Threats
Losing an important USB, Accidentally deleting files etc.
Deliberate Security Threats
Hacking, Malware, Trojans, Phishing etc.
Power Surge
Occurs when incoming electrical power increases more than 5% above the normal system voltage. A spike can be caused by a lightening bolt striking power lines. Can result in permanent damage to a computer or network.
What does a good password contain?
Symbols, numbers, a capital letter.
Does not include names, phone numbers or addresses.