Transcript Chapter 19 Slides

A+ Guide to Managing
and Maintaining Your PC
Fifth Edition
Chapter 19
PCs on the Internet
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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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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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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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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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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Hands-on Project: Configuring a
Browser

pp. 911 – pp. 914

Figure 19-22, Figure 19-23
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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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