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26 Cards in this Set
- Front
- Back
A Network
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A collection of computers and devices connected together via communications devices and transmission media, allowing computers to share resources.
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Network Advantages and Disadvantages
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Advantages- Sharing Hardware, Sharing Data and information, transferring funds etc.
Disadvantages- User dependence, network management, viruses, privacy issues etc. |
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Local Area Network
(LAN) |
A group of computers connected by a neighbouring geographic area that enables users to share information and resources.
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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.
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A Peer- to Peer Network
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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.
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Internet Peer-to-Peer
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Allows users with the use of internet to connect to another ‘peers’ hard disks and exchange files.
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Client/Server Network
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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.
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A Bus Topology
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A bus network is connected by a single central cable in which all other devices are connected to.
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Bus Topology Advantages and Disadvantages
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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. |
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A Star Topology
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Consists of multiple nodes connected to a central hub forming a star.
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Star Topology Advantages and Disadvantages
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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. |
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Ethernet
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A standard communications protocol embedded in software and hardware devices that allows computers to operate a LAN.
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TCP/IP
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Transmission control protocol/ Internet protocol.
Manages the transmission of data by breaking it up into packets and transmitting the packets over the internet. |
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802.11
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Developed to specify how two wireless computers or devices communicate via radio waves with each other.
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Wireless Application Protocol
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Allows wireless mobile devices to access the internet and its services, such as email.
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Modems
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Modulator-Demodulator.
Coverts analogue signals to digital vice versa. |
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Network Interface Cards
(NIC) |
Allows stand alone computers to connect to a network. Usually in-built into motherboard.
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Wireless Access point
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A central communications device that allows computers and devices to to transmit data wirelessly among themselves.
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Switches
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A device which provides a common connection point for nodes on a network.
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Routers
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A communications device that connects multiple networks.
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Coaxial Cables
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Used as a transmission line for radio frequencies. They carry signals great distances and carry internet connections via Ethernet cables.
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Fiber-optic Cable
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Used for TV and Computers. Transmits light faster than any other cable technology.
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Accidental Security Threats
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Losing an important USB, Accidentally deleting files etc.
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Deliberate Security Threats
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Hacking, Malware, Trojans, Phishing etc.
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Power Surge
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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.
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What does a good password contain?
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Symbols, numbers, a capital letter.
Does not include names, phone numbers or addresses. |