Discovering Computers Technology in a World of Computers, Mobile Devices, and the Internet
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1 Discovering Computers Technology in a World of Computers, Mobile Devices, and the Internet Chapter 10 Communications and Networks Objectives Overview See Page 416 for Detailed Objectives
2 Objectives Overview See Page 416 for Detailed Objectives Communications Digital communications describes a process in which two or more computers or devices transfer data, instructions, and information Page 416
3 Communications Page 417 Figure 10-1 Networks A networkis a collection of computers and devices connected together via communications devices and transmission media Advantages of a network include: Pages
4 Networks Page 418 Figure 10-2 Networks A local area network (LAN) is a network that connects computers and devices in a limited geographical area A wireless LAN (WLAN) is a LAN that uses no physical wires Pages Figures
5 Networks A metropolitan area network (MAN) connects LANs in a metropolitan area A wide area network (WAN) is a network that covers a large geographic area A personal area network (PAN) is a network that connects computers and devices in an individual s workspace with wired and wireless technology Page 421 Figure 10-5 Networks The configuration of computers, devices, and media on a network is sometimes called the network architecture Client/server network Peer-to-peer network Pages Figures
6 Networks A network topologyrefers to the layout of the computers and devices in a communications network Star network Bus network Ring network Pages Figures Network Communications Standards and Protocols Page 425
7 Network Communications Standards and Protocols Pages Network Communications Standards and Protocols Page 426 Figure 10-11
8 Network Communications Standards and Protocols Wi-Fiidentifies any network based on the standard that specifies how two wireless devices communicate over the air with each other Bluetoothis a network protocol that defines how two Bluetooth devices use short-range radio waves to transmit data UWB(ultra-wideband) is a network standard that specifies how two UWB devices use short-range radio waves to communicate at high speeds with each other IrDA transmits data wirelessly via infrared (IR) light waves RFID is a protocol that defines how a network uses radio signals to communicate with a tag placed in or attached to an object, an animal, or a person Pages Network Communications Standards and Protocols Page 430 Figure 10-12
9 Network Communications Standards and Protocols Pages Communications Software Communications softwareconsists of programs and apps that: Page 431
10 Communications Lines Pages Communications Lines Page 433 Table 10-2
11 Communications Lines ADSL is a type of DSL that supports faster transfer rates when receiving data Page 433 Figure Communications Devices A communications deviceis any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device Page 434
12 Communications Devices A broadband modem sends and receives data and information to and from a digital line Page 435 Communications Devices Page 435 Figure 10-15
13 Communications Devices A wireless modem uses a mobile phone provider s network to connect to the Internet wirelessly from a computer or mobile device Page 436 Figure Communications Devices A wireless access point is a central communications device that allows computers and devices to transfer data wirelessly among themselves or to a wired network Page 436 Figure 10-17
14 Communications Devices A router connects multiple computers or other routers together and transmits data to its correct destination on a network Page 437 Figure Communications Devices A network card enables a computer or device that does not have built-in networking capability to access a network Available in a variety of styles Page 439 Figure 10-20
15 Communications Devices A hub or switch is a device that provides a central point for cables in a network Page 439 Figure Home Networks Many home users connect multiple computers and devices together in a home network Pages
16 Transmission Media Transmission media carries one or more communications signals Broadbandmedia transmit multiple signals simultaneously The amount of data, instructions, and information that can travel over transmission media sometimes is called the bandwidth Latencyis the time it takes a signal to travel from one location to another on a network Page 442 Figure Physical Transmission Media Page 443 Table 10-3
17 Physical Transmission Media Twisted-pair cable Fiber-optic cable Coaxial cable Pages Figures Wireless Transmission Media Page 445 Table 10-4
18 Wireless Transmission Media Broadcast radio is a wireless transmission medium that distributes radio signals through the air over long distances Cellular radiois a form of broadcast radio that is used widely for mobile communications Pages Figure Wireless Transmission Media Microwaves are radio waves that provide a highspeed signal transmission Page 447 Figure 10-27
19 Wireless Transmission Media A communications satelliteis a space station that receives microwave signals from an earth-based station, amplifies it, and broadcasts the signal over a wide area Page 448 Figure Wireless Transmission Media A global positioning system (GPS) is a navigation system that consists of one or more earth-based receivers that accept and analyze signals sent by satellites in order to determine the receiver s geographical location Page 449
20 Wireless Transmission Media Page 449 Figure Summary Page 451
21 Discovering Computers Technology in a World of Computers, Mobile Devices, and the Internet Chapter 10 Communications and Networks Chapter 10 Complete
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