computer concepts – illustrated 8 th edition unit e: networks and connecting to the internet
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Computer Concepts – Illustrated 8th edition
Unit E: Networks and Connecting to the InternetUnit E: Networks and Connecting to the Internet
Computer Concepts – Illustrated 8th Edition 2
Objectives
Introduce networks
Explore network hardware
Compare wireless and wired technology
Set up a network
Access network resources
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Objectives (continued)
Introduce Internet technology
Connect to the Internet with wires
Connect to the Internet wirelessly
Explore IP addresses and domain names
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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
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Introducing Networks (continued)
Sharing networked hardware can: Reduce costs Expand access
Sharing networked software can: Reduce costs Facilitate data sharing Enable collaboration
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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)
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
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Figure E-4: Structure of a client/server network
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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
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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
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Figure E-9: Wi-Fi equipment
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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
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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
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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
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Figure E-14: Basic configuration for a combined wired and wireless network
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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
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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
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Figure E-18: Ways of connecting a printer to a network
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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
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Figure E-19: Connecting your computer to the Internet
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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
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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
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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
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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
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Connecting to the Internet Wirelessly
Satellite Internet service Always-on, high-speed, and asymmetric
Internet access
Figure E-27: Connect using satellite
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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
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Exploring IP Addresses and Domain Names
IP address Used to identify a computer while it is
connected to the Internet Example: 204.127.129.001 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
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Figure E-32: Network Connection Details
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Figure E-33: How domain names work
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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
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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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