Download A+ Guide to Managing and Maintaining Your PC, 5e

A+ Guide to Managing
and Maintaining Your PC
Fifth Edition
Chapter 19
PCs on the Internet
You Will Learn…

About the TCP/IP suite of protocols

How to connect to the Internet using dial-up,
DSL, and cable modem connections

About supporting common Internet clients
such as Web browsers, email clients, and file
transfer software
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Client/Server Applications on
the Internet
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The TCP/IP Suite of Protocols

How a client addresses a server application on
another computer

How protocols in TCP/IP suite are used on
intranets and Internet to support client/server
applications
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Using IP and Port Addresses to
Identify Services
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Common Port Assignments
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TCP/IP Network Layers
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TCP/IP Protocol Layers

Applications protocols

Applications make an API call to the OS

TCP/IP protocols used by the OS for network
communication

Network protocols used by hardware

Included in firmware and drivers on a single NIC

Protocol used depends on type of physical network
data is traveling on (eg, PPP)
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TCP/IP Protocols Used by the
OS for Network Communication
TCP
UDP
IP
ARP
RARP
ICMP
Guarantees packet delivery
 Connection-oriented protocol
 Does not guarantee delivery
 Connectionless protocol
 Breaks up and reassembles data into packets; routes
them to their destination
 Locates host on a local network
 Discovers Internet address of host on local network
 Communicates problems with transmission

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Internet Protocol (IP)
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Transmission Control Protocol
(TCP)
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TCP/IP Utilities
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TCP/IP Utilities (continued)
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Other Tools


Microsoft SNMP Agent

Provides system management for networks

Can be security risk
NSLookup

Reports information about Internet name space

Requests information about domain name
resolutions from DNS server’s zone data
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Ways to Connect to the Internet

Standard dial-up modem

DSL

Cable modem
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Dial-up Networking

Uses PPP to send packets of data over phone
lines

Must install modem and drivers to run it

Must install TCP/IP and bind it to the modem
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How Dial-up Networking Works
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Creating a Dial-up Networking
Connection

Windows XP


Windows 2000


Network Connections applet in Control Panel
Network and Dial-up Connections applet in
Control Panel
Windows 9x

Dial-up Networking and Network Connection
applets in My Computer
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Creating a Dial-up Connection
in Windows 2000/XP

Using Windows XP, launch New Connection
Wizard

Configure connection using Properties window
of the connection icon
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Creating a Dial-up Connection
in Windows 98

Install Dial-Up Networking as an OS
component on PC using Add/Remove
Programs applet in Control Panel

At same time, a dial-up adapter (virtual
network card) is also installed

Create and configure Dial-up Networking
connection
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Configuring the Windows 98
Dial-up Networking Connection
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Dial-up Networking Problems




Cannot make a connection
Can connect, but get message “Unable to
resolve hostname…”
After connecting, get error message “Unable to
establish a compatible set of network
protocols”
When double-click Web browser, modem does
not dial automatically
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DSL and Cable Modem
Connections

Broadband technologies

Support transmission of more than one kind of
data at once

TCP/IP settings usually the same as modemto-phone line connection

Use a network card in the PC for physical
connection to network
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Installation of DSL and Cable
Modem Internet Connections
1. Install network card and drivers to control it
2. Use network cable to connect PC to cable
modem or DSL box
3. Install TCP/IP and bind TCP/IP to the card
4. Configure TCP/IP to connect to Internet or
LAN
5. Install application software (eg, browser) to
use the connection
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Cable Modem
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DSL and ISDN Service

Provided by local telephone company

Uses DSL/ISDN converter box, sometimes
combined with a router

DSL uses a DSL router

ISDN connection uses Terminal Adapter (TA) or
ISDN router
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Sharing Internet Connections

One computer on the LAN with direct
connection to Internet can serve as host
computer for others on the LAN (ICS)

For broadband connections, broadband
converter box can connect to network device
that manages connection for entire network

Router can serve as a wireless access point for
computers to connect wirelessly to Internet
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Implementing a Firewall

Filters data packets, ports, applications, and
information

Hardware firewalls

Software firewalls
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Hardware Firewalls
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Software Firewalls
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Supporting Internet Clients

Web browsers

Email

FTP (File Transfer Protocol)
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Supporting Web Browsers

Addresses that Web browsers use to locate
resources on a Web server (Uniform Resource
Locator)

Ensuring privacy with HTTPS and SSL

Troubleshooting common problems that occur
with Web browsers
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URL Structure
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Top-Level Domain Names
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Ensuring Privacy Between the
Web Server and Browser
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Configuring a Browser

Internet Explorer


Internet Options window
Netscape Navigator

Edit - Preferences
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Configuring a Browser (continued)
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Configuring a Browser (continued)
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Solving Browser Performance
Problems

Clean up hard drive (Defrag, ScanDisk)

Optimize system settings (System Information)

Clear browser cache and Web page history

Suppress image downloads

Download browser updates and patches
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Supporting Email
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Supporting Email (continued)
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Supporting FTP

Used to transfer files between two computers
using the same or different operating system(s)

Both computers must have FTP installed

Can be executed from user-friendly GUI
software or from a command prompt
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FTP from a Command Prompt
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File Transfer Using FTP
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File Transfer Using FTP
(continued)
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Summary

Connecting to the Internet using Windows

How TCP/IP suite of protocols is used

How to create and troubleshoot dial-up and
broadband connections to the Internet

How to support popular applications that use
the Internet (Web browsers, email clients, FTP
software)
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