chapter 6 - CHAPTER 6 * Network- a collection of computers...

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CHAPTER 6 * Network- a collection of computers that communicate with one another over transmission lines • Local area network- (LAN) connects computers that reside in a single geographic location on the premises of the company that operates the LAN • Wide area networks- (WANs) connect computers at different geographic locations • Internet- a network of networks • The Internet- the collection of networks that you use when you send email or access a Web site • Protocol- a set of rules that two communicating devices follow • There are many different protocols:some used for LAN, some used for WANs, some used for internets and the Internet, and some used for all of these • Switch- a special-purpose computer that receives and transmits messages on the LAN • Network interface card (NIC) – connects the device’s circuitry to the cable • Onboard NIC – an NIC built into a computer • MAC (media access control) address- a unique identifier that each NIC has • Unshielded twisted pair (UTP) cable- most connections between devices on a LAN are made with a UTP • Optical fiber cables- can replace a UTP if they carry a lot of traffic or are far apart. The signals on such cables are light rays and are reflected inside the glass core of the optical fiber cable • IEEE 802.3 protocol- aka Ethernet- specifies hardware characteristics such as which wire carries which signals, and also describes how messages are to be packages and processed for transmission over the LAN • 10/100/1000 ethernet- conform to the 802.3 specification and allow for transmission at a rate of 10, 100, or 1000 Mbps (megabits per second) • Wireless NIC (WNIC) – devices where the NIC has been replaced. Usually the WNIC device is a card in an expansion slot, or a built-in device • IEEE 802.11 g- as of 2008, the most popular protocol • Access point (AP) – must be able to process messages according to both the 802.3 and the 802.11 standards because it sends and receives wireless traffic using the 802.11 protocol and then communicates with the switch using the 802.3 protocol. • Internet service provider (ISP) – you connect to computers owned and operated by your ISP
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chapter 6 - CHAPTER 6 * Network- a collection of computers...

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