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

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



Objectives (continued)

Introduce Internet technology

Connect to the Internet with wires

Connect to the Internet wirelessly

Explore IP addresses and domain names



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



Introducing Networks (continued)

Sharing networked hardware can: Reduce costs Expand access

Sharing networked software can: Reduce costs Facilitate data sharing Enable collaboration


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


Figure E-4: Structure of a client/server network


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


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


Figure E-9: Wi-Fi equipment


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


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


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


Figure E-14: Basic configuration for a combined wired and wireless network


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


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


Figure E-18: Ways of connecting a printer to a network


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


Figure E-19: Connecting your computer to the Internet


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


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


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


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


Connecting to the Internet Wirelessly

Satellite Internet service Always-on, high-speed, and asymmetric

Internet access

Figure E-27: Connect using satellite


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


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


Figure E-32: Network Connection Details


Figure E-33: How domain names work


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


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

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

Documents

wifi network

ethernet network

network devices

clientserver network

network ethernet card

wireless signals slide

server computer concepts

internet slide