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Computer Concepts – Illustrated 8 th edition Unit E: Networks and Connecting to the Internet.

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Presentation on theme: "Computer Concepts – Illustrated 8 th edition Unit E: Networks and Connecting to the Internet."— Presentation transcript:

1 Computer Concepts – Illustrated 8 th edition Unit E: Networks and Connecting to the Internet

2 Computer Concepts – Illustrated 8th Edition 2 Objectives Introduce networks Explore network hardware Compare wireless and wired technology Set up a network Access network resources Computer Concepts – Illustrated 8th Edition 2

3 3 Objectives (continued) Introduce Internet technology Connect to the Internet with wires Connect to the Internet wirelessly Explore IP addresses and domain names Computer Concepts – Illustrated 8th Edition 3

4 4 Introducing Networks Computer network Combination of hardware, software, cables, and signals that: Transport data Allow computers to communicate with each other and other electronic devices Computer Concepts – Illustrated 8th Edition 4

5 5 Introducing Networks (continued) Sharing networked hardware can: Reduce costs Expand access Sharing networked software can: Reduce costs Facilitate data sharing Enable collaboration

6 Computer Concepts – Illustrated 8th Edition 6 Introducing Networks (continued) Disadvantages of networks: Vulnerability to unauthorized access Vulnerability to malicious code Types of networks: PAN (personal area network) LAN (local area network) NAN (neighborhood area network) MAN (metropolitan area network) WAN (wide area network)

7 Exploring Network Hardware Client/server network Server computer provides services and resources to client computers Peer-to-peer (P2P) networks Do not have a server Computer Concepts – Illustrated 8th Edition 7 Figure E-4: Structure of a client/server network

8 Computer Concepts – Illustrated 8th Edition 8 Exploring Network Hardware (continued) Network devices include: Modem Network hub Network switch Network router Network interface card (NIC) Required by devices to connect to a network Ethernet card Also called an Ethernet adapter or NIC A NIC that supports Ethernet protocols

9 Computer Concepts – Illustrated 8th Edition 9 Comparing Wireless and Wired Technology Wired network Data travels over cables More secure Offers faster speeds Wireless network Data travels through the air Offers mobility Wi-Fi card: a wireless NIC Wireless access point: device that transmits and receives wireless signals

10 Computer Concepts – Illustrated 8th Edition 10 Figure E-9: Wi-Fi equipment

11 Computer Concepts – Illustrated 8th Edition 11 Comparing Wireless and Wired Technology (continued) Wireless router: wireless access point that includes circuitry to connect a Wi-Fi network to the Internet Wi-Fi (Wireless Fidelity): most popular wireless LAN technology Wireless networks use: RF (radio frequency) signals Microwave signals Infrared signals

12 Computer Concepts – Illustrated 8th Edition 12 Setting Up a Network Setting up an Ethernet network It is easy to install a wired network Setting up a wireless network Place wireless router in a central location Set up the router Connect to the router with a computer Configure the router Access the router setup utility Create a new router password

13 Computer Concepts – Illustrated 8th Edition 13 Setting Up a Network (continued) Setting up a wireless network (continued) Enter an SSID (service set identifier) Activate security and create an encryption key Set up the wireless workstations Connect an Internet access device

14 Computer Concepts – Illustrated 8th Edition 14 Figure E-14: Basic configuration for a combined wired and wireless network

15 Computer Concepts – Illustrated 8th Edition 15 Accessing Network Resources Windows automatically detects networks You can also click the workgroup name to access a workgroup Adding computers to a wireless network When SSID broadcasting is turned on, you can easily find the network Number of ways available to access shared resources on other network computers

16 Computer Concepts – Illustrated 8th Edition 16 Accessing Network Resources (continued) Drive mapping Assigns a drive letter to a storage device located on a network computer File Sharing dialog box Used to allow other network users to access files or folders on a Windows computer To share a printer over a network: If using Windows, enable printer sharing using the Windows Control Panel Connect a printer in one of three ways

17 Computer Concepts – Illustrated 8th Edition 17 Figure E-18: Ways of connecting a printer to a network

18 Computer Concepts – Illustrated 8th Edition 18 Introducing Internet Technology Network service providers (NSPs) Maintain Internet backbone links and routers ISP (Internet service provider) Connects computers to Internet or an NSP Bandwidth determines how fast data travels over a network Broadband: cable TV, DSL Narrowband: dial-up Internet access Upstream speed Downstream speed

19 Computer Concepts – Illustrated 8th Edition 19 Figure E-19: Connecting your computer to the Internet

20 Computer Concepts – Illustrated 8th Edition 20 Introducing Internet Technology (continued) TCP/IP Protocol that regulates Internet data transport A standard for LANs and WANs TCP (Transmission Control Protocol) IP (Internet Protocol) Connection options Fixed Internet access Portable Internet access Mobile Internet access

21 Computer Concepts – Illustrated 8th Edition 21 Connecting to the Internet with Wires Dial-up connection Data carried over telephone call circuit Voiceband modem (or modem): converts digital signals from a computer into analog signals Figure E-22: Connect using phone lines

22 Computer Concepts – Illustrated 8th Edition 22 Connecting to the Internet with Wires (continued) DSL (digital subscriber line) High-speed, digital, always-on Uses standard phone lines to transport data Figure E-24: Connect using DSL

23 Computer Concepts – Illustrated 8th Edition 23 Connecting to the Internet with Wires (continued) Cable Internet connection Always-on broadband Internet access Uses the infrastructure of cable television service Figure E-26: Connect using cable TV

24 Computer Concepts – Illustrated 8th Edition 24 Connecting to the Internet Wirelessly Satellite Internet service Always-on, high-speed, and asymmetric Internet access Figure E-27: Connect using satellite

25 Computer Concepts – Illustrated 8th Edition 25 Connecting to the Internet Wirelessly (continued) Fixed wireless Internet service Offers Internet access by broadcasting data signals over large areas WiMAX: Ethernet-compatible network standard Public Wi-Fi network: wireless LAN that provides open Internet access to the public WAP (Wireless Access Protocol): provides wireless Internet access from handheld devices

26 Computer Concepts – Illustrated 8th Edition 26 Exploring IP Addresses and Domain Names IP address Used to identify a computer while it is connected to the Internet Example: Static IP address: permanently assigned Dynamic IP address: temporary Domain name Every domain name corresponds to a unique IP address Ends with an extension that indicates its top-level domain

27 Computer Concepts – Illustrated 8th Edition 27 Figure E-32: Network Connection Details

28 Computer Concepts – Illustrated 8th Edition 28 Figure E-33: How domain names work

29 Computer Concepts – Illustrated 8th Edition 29 Talking Points: Why Pay for Internet Access if You Can Get It for Free? Is free Internet access always legal? Data security Hackers can use unprotected wireless systems to steal financial information, download child pornography, etc. Unregulated network availability raises ethical, security, and privacy issues Free WLAN controversy Telecommunications giants vs. free WLAN advocates

30 Computer Concepts – Illustrated 8th Edition 30 Summary This chapter introduced: Computer networks Network hardware Setting up a network Accessing network resources Technologies behind the Internet Options for connecting to the Internet Implications of free Wi-Fi technology and free Internet access to the public


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