Discovering Computers 2012 - Chapter 9 PDF

Discovering Computers 2012 Your Interactive Guide to the Digital World Objectives Overview Discuss the purpose of the components List advantages of required for successful Describe the uses of using a networ...

Discovering Computers 2012 Your Interactive Guide to the Digital World Objectives Overview Discuss the purpose of the components List advantages of required for successful Describe the uses of using a network, and communications and computer differentiate among identify various communications LANs, MANs, and sending and receiving WANs devices Differentiate between Differentiate among a Describe the various client/server and peer- star network, bus network to-peer networks, and network, and ring communications describe how a P2P network standards network works See Page 459 Discovering Computers 2012: Chapter 9 2 for Detailed Objectives Objectives Overview Describe various Explain the Describe types of lines for purpose of commonly used communications communications communications over the telephone software devices network Describe various Discuss different physical and ways to set up a wireless home network transmission media See Page 459 Discovering Computers 2012: Chapter 9 3 for Detailed Objectives Communications Computer communications describes a process in which two or more computers or devices transfer data, instructions, and information Communica Sending Receiving tions device device channel Page 460 Discovering Computers 2012: Chapter 9 4 Communications Pages 460 – 461 Discovering Computers 2012: Chapter 9 5 Figure 9-1 Uses of Computer Communications Chat Blogs E-mail Fax rooms Instant Newsgrou FTP messagin Internet ps g Video RSS conferenci VoIP Web ng Web Web 2.0 Wikis folders Page 462 Discovering Computers 2012: Chapter 9 6 Uses of Computer Communications Users can send and receive wireless messages using wireless messaging services Pages 462 – 463 Discovering Computers 2012: Chapter 9 7 Figure 9-3 Uses of Computer Communications Text messaging (SMS) allows users to send and receive short text messages on a phone or other mobile device or computer Picture messaging allows users to send pictures and sound files Video messaging allows users to send short video clips Wireless instant messaging allows wireless users to exchange real-time messages with one or more other users Pages 463 - 464 Discovering Computers 2012: Chapter 9 8 Uses of Computer Communications Wireless Internet access points allow people to connect wirelessly to the Internet from home, work, school, and in many public locations Pages 464 – 465 Discovering Computers 2012: Chapter 9 9 Figure 9-4 Uses of Computer Communications A cybercafé is a coffeehouse, restaurant, or other location that provides personal computers with Internet access to its customers Page 466 Discovering Computers 2012: Chapter 9 10 Figure 9-5 Uses of Computer Communications 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 GPS receiver’s geographic location GPS Built into are: Available receivers Available many as a with new mobile handheld vehicles devices device Page 466 Discovering Computers 2012: Chapter 9 11 Uses of Computer Communications Page 467 Discovering Computers 2012: Chapter 9 12 Figure 9-6 Uses of Computer Communications Groupware Voice mail Helps groups of people Allows someone to work together on leave a voice message projects and share for one or more people information over a Computer in voice mail network system converts an Component of analog voice message workgroup computing into digital form Major feature is group A voice mailbox is a scheduling storage location on a hard disk in the voice mail system Page 467 Discovering Computers 2012: Chapter 9 13 Uses of Computer Communications Many programs provide a means to collaborate, or work online, with other users connected to a server Collaboration software includes tools that enable users to share documents via online meetings and communicate with other connected users Web Document Online conferenc manageme meetings es nt systems Page 468 Discovering Computers 2012: Chapter 9 14 Uses of Computer Communications Page 468 Discovering Computers 2012: Chapter 9 15 Figure 9-7 Uses of Computer Communications Web services enable programmers to create applications that communicate with other remote computers over the Internet or on an internal business network A mashup is a Web application that combines services from two or more sources Page 469 16 Discovering Computers 2012: Chapter 9 Figure 9-8 Networks A network is a collection of computers and devices connected together via communications devices and transmission media Advantages Facilitating of a network include: Sharing data Sharing communicati and hardware ons information Sharing Transferring software funds Pages 470 - 471 Discovering Computers 2012: Chapter 9 17 Networks Page 470 Discovering Computers 2012: Chapter 9 18 Figure 9-9 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 Page 472 19 Discovering Computers 2012: Chapter 9 Figures 9-10 – 9-11 Networks A metropolitan area network (MAN) connects LANs in a metropolitan area A wide area network (WAN) is a network that covers a large geographical area Page 473 Discovering Computers 2012: Chapter 9 20 Figure 9-12 Networks The design of computers, devices, and media on a network is sometimes called the network architecture Client/server network Peer-to-peer network Pages 473 – 474 Discovering Computers 2012: Chapter 9 21 Figures 9-13 – 9-14 Networks P2P describes an Internet network on which users access each other’s hard disks and exchange files directly over the Internet Page 475 Discovering Computers 2012: Chapter 9 22 Figure 9-15 Networks A network topology refers to the layout of the computers and devices in a communications network Star network Bus network Ring network Pages 475 – 477 Discovering Computers 2012: Chapter 9 23 Figures 9-16 – 9-18 Networks An An extranet intranet allows is an custome internal rs or network supplier that s to uses access Internet part of technolo its gies intranet Page 477 Discovering Computers 2012: Chapter 9 24 Network Communications Standards Etherne Token TCP/IP Wi-Fi t ring Bluetoo UWB IrDA RFID th WiMAX WAP Page 477 Discovering Computers 2012: Chapter 9 25 Network Communications Standards Ethernet is a network standard that specifies no computer controls when data can be transmitted The token ring standard specifies that computers and devices on the network share or pass a special signal (token) TCP/IP is a network standard that defines how messages are routed from one end of a network to another Page 478 Discovering Computers 2012: Chapter 9 26 Network Communications Standards Page 479 Discovering Computers 2012: Chapter 9 27 Figure 9-19 Network Communications Standards Wi-Fi identifies any network based on the 802.11 standard that facilitates wireless communication Sometimes referred to as wireless Ethernet Page 479 28 Discovering Computers 2012: Chapter 9 Figure 9-20 Network Communications Standards Bluetooth defines how two Bluetooth devices use short-range radio waves to transmit data UWB (ultra-wideband) specifies how two UWB devices use short-range radio waves to communicate at high speeds IrDA transmits data wirelessly via infrared (IR) light waves RFID uses radio signals to communicate with a tag placed in or attached to an object, animal, or person Pages 480 - 481 Discovering Computers 2012: Chapter 9 29 Network Communications Standards Page 481 Discovering Computers 2012: Chapter 9 30 Figure 9-21 Network Communications Standards Wireless Application WiMAX (802.16) Protocol (WAP) Developed by IEEE Specifies how some Towers can cover a mobile devices can 30-mile radius display the content of Two types are fixed Internet services wireless and mobile Web wireless E-mail Provides wireless Chat rooms broadband Internet Uses a client/server access network Page 482 Discovering Computers 2012: Chapter 9 31 Communications Software Communications software consists of programs that: Help users Manage the establish a transmission of connection to data, another instructions, computer or and information network Provide an interface for users to communicate with one another Page 482 Discovering Computers 2012: Chapter 9 32 Communications Over the Telephone Network The public switched telephone network (PSTN) is the worldwide telephone system Pages 482 – 483 Discovering Computers 2012: Chapter 9 33 Figure 9-23 Communications Over the Telephone Network Dedica Dial-up ISDN ted lines line line T- DSL FTTP carrier line ATM Pages 483 - 485 Discovering Computers 2012: Chapter 9 34 Communications Over the Telephone Network Page 483 Discovering Computers 2012: Chapter 9 35 Figure 9-24 Communications Over the Telephone Network ADSL connections transmit data downstream at a much faster rate than upstream Page 484 Discovering Computers 2012: Chapter 9 36 Figure 9-25 Communications Devices A communications device is any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device A dial-up modem converts signals between analog and digital Page 485 Discovering Computers 2012: Chapter 9 37 Communications Devices A digital modem sends and receives data and information to and from a digital line DSL Cable modem modem Page 486 Discovering Computers 2012: Chapter 9 38 Communications Devices Page 486 39 Discovering Computers 2012: Chapter 9 Figures 9-26 – 9-27 Communications Devices A wireless modem uses the cell phone network to connect to the Internet wirelessly from a notebook computer, a smart phone, or other mobile device Page 487 Discovering Computers 2012: Chapter 9 40 Figure 9-28 Communications Devices A network card enables a computer or device to access a network Available in a variety of styles Wireless network cards often have an antenna Page 487 41 Discovering Computers 2012: Chapter 9 Figure 9-29 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 487 Discovering Computers 2012: Chapter 9 42 Figure 9-30 Communications Devices A router connects multiple computers or other routers together and transmits data to its correct destination on a network Many are protected by a hardware firewall Page 488 43 Discovering Computers 2012: Chapter 9 Figure 9-31 Communications Devices A hub or switch connects several devices in a network together Pages 488 – 489 Discovering Computers 2012: Chapter 9 44 Figure 9-32 Home Networks Home networks provide computers with the following capabilities: Share a single Access files and Connect to the high-speed programs on Share Internet at the Internet other peripherals same time connection computers Connect game Play multiplayer Subscribe to consoles to the games and use VoIP Internet Page 489 Discovering Computers 2012: Chapter 9 45 Home Networks Types of wired home networks: Powerline Ethernet cable Phoneline Page 489 Discovering Computers 2012: Chapter 9 46 Home Networks Page 490 Discovering Computers 2012: Chapter 9 47 Figure 9-33 Communications Channel The amount of data that can travel over a communications channel sometimes is called the bandwidth Latency is the time it takes a signal to travel from one location to another on a network Transmission media carries one or more signals Broadband media transmit multiple signals simultaneously Page 491 48 Discovering Computers 2012: Chapter 9 Figure 9-34 Physical Transmission Media Page 492 Discovering Computers 2012: Chapter 9 49 Figure 9-35 Physical Transmission Media Twisted-pair cable Fiber-optic cable Coaxial cable Page 493 Discovering Computers 2012: Chapter 9 50 Figures 9-36 – 9-38 Wireless Transmission Media Page 494 Discovering Computers 2012: Chapter 9 51 Figure 9-39 Wireless Transmission Media Cellular radio is a form of broadcast radio that is used widely for mobile communications Pages 494 - 495 Discovering Computers 2012: Chapter 9 52 Figure 9-40 Wireless Transmission Media Microwaves are radio waves that provide a high-speed signal transmission Page 496 Discovering Computers 2012: Chapter 9 53 Figure 9-41 Wireless Transmission Media A communications satellite is a space station that receives microwave signals from an earth- based station, amplifies it, and broadcasts the signal over a wide area Page 496 Figure 9-42 Discovering Computers 2012: Chapter 9 54 Summary Overview of communication How to join s terminology computers into and a network applications Various communication s devices, media, and procedures Page 497 Discovering Computers 2012: Chapter 9 55 Discovering Computers 2012 Your Interactive Guide to the Digital World Chapter 9 Complete