Transcript Computer Concepts – Illustrated 8th edition

Computer Concepts – Illustrated
8th edition
Unit E: Networks and Connecting to the Internet
Objectives
Introduce networks
Explore network hardware
Compare wireless and wired technology
Set up a network
Access network resources
Computer Concepts – Illustrated 8th Edition
2
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
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
Introducing Networks (continued)
Sharing networked hardware can:
 Reduce costs
 Expand access
Sharing networked software can:
 Reduce costs
 Facilitate data sharing
 Enable collaboration
Computer Concepts – Illustrated 8th Edition
5
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)
Computer Concepts – Illustrated 8th Edition
6
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
Computer Concepts – Illustrated 8th Edition
7
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
Computer Concepts – Illustrated 8th Edition
8
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
Computer Concepts – Illustrated 8th Edition
9
Figure E-9: Wi-Fi equipment
Computer Concepts – Illustrated 8th Edition
10
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
Computer Concepts – Illustrated 8th Edition
11
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
Computer Concepts – Illustrated 8th Edition
12
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
Computer Concepts – Illustrated 8th Edition
13
Figure E-14: Basic configuration for a combined wired and
wireless network
Computer Concepts – Illustrated 8th Edition
14
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
Computer Concepts – Illustrated 8th Edition
15
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
Computer Concepts – Illustrated 8th Edition
16
Figure E-18: Ways of connecting a printer to a network
Computer Concepts – Illustrated 8th Edition
17
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
Computer Concepts – Illustrated 8th Edition
18
Figure E-19: Connecting your computer to the Internet
Computer Concepts – Illustrated 8th Edition
19
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
Computer Concepts – Illustrated 8th Edition
20
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
Computer Concepts – Illustrated 8th Edition
21
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
Computer Concepts – Illustrated 8th Edition
22
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
Computer Concepts – Illustrated 8th Edition
23
Connecting to the Internet Wirelessly
Satellite Internet service
 Always-on, high-speed, and asymmetric
Internet access
Figure E-27: Connect
using satellite
Computer Concepts – Illustrated 8th Edition
24
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
Computer Concepts – Illustrated 8th Edition
25
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
Computer Concepts – Illustrated 8th Edition
26
Figure E-32: Network Connection Details
Computer Concepts – Illustrated 8th Edition
27
Figure E-33: How domain names work
Computer Concepts – Illustrated 8th Edition
28
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
Computer Concepts – Illustrated 8th Edition
29
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 8th Edition
30