Chapter 6 Definitions

Chapter 6 Definitions - Chapter 6 Page 159 Global...

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Chapter 6 Page 159: Global Positioning System (GPS) – a collection of dozens of satellites orbiting the earth that transmit precise microwave signals. A GPS receiver can calculate its position by measuring the distance between itself and several of the satellites. Network – a collection of computers that communicate with one another over transmission lines. Local area network (LAN) – a network that connects computers that reside in a single geographic location on the premises of the company that operates the LAN. The number of connected computers can range from two to several hundred. Wide area network (WAN) – a network that connects computers located at different geographical locations. Internet (not capitalized) – a private network of networks. Internet, the (capitalized) – the public network known as the Internet. Page 160: Protocol – a standardized means for coordinating an activity between two or more entities. Switch – a special-purpose computer that receives and transmits data across a network. Network interface card (NIC) – a hardware component on each device on a network (computer, printer, etc.) that connects the device’s circuitry to the communications line. The NIC works together with programs in each device to implement Layers 1 and 2 of the TCP/IP-OSI hybrid protocol. Onboard NIC – a built-in NIC. MAC (media access control) address – also called physical address . A permanent address given to each network interface card (NIC) at the factory. This address enables the device to access the network via a Level-2 protocol. By agreement among computer manufacturers, MAC addresses are assigned in such a way that no two NIC devices will ever have the same MAC address. Page 161: Unshielded twisted pair (UTP) cable – a type of cable used to connect the computers, printers, switches, and other devices on a LAN. A UTP cable has four pairs of twisted wire. A device called an RJ-45 connector is used to connect the UTP cable into NIC devices.
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Optical fibre cable – a type of cable used to connect the computers, printers, switches, and other devices on a LAN. The signals on such cables are light rays, and they are reflected inside the glass core of the optical fibre cable. The core is surrounded by a cladding to contain the light signals, and the cladding, in turn, is wrapped with an outer layer to protect it. IEEE 802.3 protocol
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This note was uploaded on 03/22/2010 for the course COMP SCI 1032 taught by Professor Goldstein during the Winter '10 term at UWO.

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Chapter 6 Definitions - Chapter 6 Page 159 Global...

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