input devices enable the user to communicate with the computer
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output devices
output devices allow the computer to communicate with the user
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network interface card (NIC)
A card that enables computers to communicate with other computers in a network.
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terminal adapter
Allows the computer to link into an Integrated Services Digital Network (ISDN)
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wireless router
Converts an internet signal into a wireless signal, which the computers and other devices in the network can use to communicate with each other and the router
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wireless network cards
the means by which the computer and other devices are able to receive and send wireless communication
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hub
Allows multiple computers to communicate over a network. A USB hub allows multiple peripherals to connect through a single USB port.
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control unit
Ensures that the instructions required to operate the computer are retrieved and interpreted in the correct sequence.
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ALU Arithmetic Logic Unit
Here the computer undertakes the mathematical or logical operations required to complete the instruction.
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Registers
This is small, fast and is used chiefly by the CPU to store: data which is to be processed within the ALU, the instructions that inform the CPU as to what is to happen to the data
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Random Access Memory (RAM)
Fast, but slower than those within the CPU and larger in size. It holds almost all other data and instructions that the computer may need for any programs open on the computer
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Read Only Memory (ROM)
This contains permanent instructions such as the Basic Input/Output (BIOS) program
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Bluetooth
Short-range communication between two devices without the need for a wireless network hub.
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Wi-fi
Connecting devices via a network hub
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Laser networks
Sending large quantities of data using a light beam to devices in line of sight. Also satellite to satellite communication.
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Infrared technology
Uses infrared LED-emitting light received by a photodiode in the receiving device, e.g. TV remote control. Cheap compared to other wireless technology and works well over short distances.
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Microwave communication
Uses short radio waves to send signals via microwave towers. Can provide analogue or digital formats.
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Network hub
the central connection point for all devices in the network. All devices have equal call on the resources and receive copies of all transmissions.
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Switch
a device that receives packets (transmissions), processes them and forwards them onto the specific device.
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Router
forwards packets between networks. It needs to be linked to at least two networks, e.g. wide area networks (WANs) or local area networks (LANs), or a LAN and the network of an internet service provider (ISP).
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Hybrid network hub
includes internet access, wireless and wired LANs. They have a fi xed number of ether net ports for wired devices and also broadcast a wi-fi signal.
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Other cards in this set
Card 2
Front
output devices allow the computer to communicate with the user
Back
output devices
Card 3
Front
A card that enables computers to communicate with other computers in a network.
Back
Card 4
Front
Allows the computer to link into an Integrated Services Digital Network (ISDN)
Back
Card 5
Front
Converts an internet signal into a wireless signal, which the computers and other devices in the network can use to communicate with each other and the router
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