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for the distribution of large files and has become the method of choice for distributing Linux distributions and large open-source applications such as Apache and OpenOffice.

Figure 25-56 Windows Live Messenger in action

These example programs just scratch the surface of the many applications that use the Internet. One of the more amazing aspects of TCP/IP is that its basic design is around 30 years old. We use TCP/IP in ways completely outside the original concept of its designers, yet TCP/IP continues to show its power and flexibility. Pretty amazing!

Figure 25-57 µTorrent

Chapter Review

Questions

1. Of the following four Internet connection options, which typically offers the slowest connection speed?

A. Cable

B. Dial-up

C. DSL

D. Satellite

2. Which of the following technologies use dial-up connections? (Select two.)

A. Cable modem

B. DSL receiver

C. ISDN TA

D. Modem

3. What advantages does dial-up have over DSL?

A. Dial-up is faster than DSL

B. You can be farther than 18,000 feet from a main phone service switching center.

C. You can get a second phone line to use just for dial-up.

D. None. Dial-up has no advantages over DSL.

4. Which protocol can you use to send e-mail?

A. IMAP

B. POP3

C. PPP

D. SMTP

5. Which protocols can you use to receive e-mail? (Select two.)

A. IMAP

B. POP3

C. PPP

D. SMTP

6. What advantage does satellite have over cable for connecting to the Internet?

A. Satellite is faster than cable.

B. Cable degrades in stormy weather; satellite does not.

C. Satellite requires you to be within 18,000 feet of a central switch.

D. Cable is limited to areas with cable installed; satellite is not.

7. Which Microsoft technology enables you to share a single Internet connection with multiple computers?

A. Internet Connection Sharing

B. My Network Places

C. Remote Access

D. Remote Desktop

8. What command often enables you to diagnose TCP/IP errors such as connection problems?

A. FTP

B. PING

C. POP3

D. VoIP

9. At what layer of the OSI seven-layer model do proxy servers operate?

A. Layer 1, Physical

B. Layer 2, Data Link

C. Layer 6, Presentation

D. Layer 7, Application

10. Which of the following programs enable you to access and work on a remote computer from your local computer? (Select two.)

A. FTP

B. Internet Connection Sharing

C. Remote Desktop

D. Telnet

Answers

1. B. Dial-up connections are robust and widely available, but slower than the newer connection types.

2. C, D. ISDN terminal adapters and traditional modems use dial-up for connecting to the Internet.

3. B. DSL has a fairly short limit of 18,000 feet from a main switch, leaving people in rural areas (in the United States, at least) out of luck. Dial-up just requires a phone line.

4. D. You can use SMTP to send e-mail messages.

5. A, B. You can use either IMAP or POP3 to receive e-mail messages.

6. D. Clearly, satellite cuts you loose from the wires!

7. A. Internet Connection Sharing enables you to share a single Internet connection with multiple computers.

8. B. You can often use the PING command to diagnose TCP/IP problems.

9. D. Proxy servers operate at Layer 7, the Application layer.

10. C, D. Both Telnet and Remote Desktop enable you to access and work on a remote computer. The latter is just prettier!

CHAPTER 26

Securing Computers

In this chapter, you will learn how to

Explain the threats to your computers and data

Describe key security concepts and technologies

Explain how to protect computers from network threats

Your PC is under siege. Through your PC, a malicious person can gain valuable information about you and your habits. He can steal your files. He can run programs that log your keystrokes and thus gain account names and passwords, credit card information, and more. He can run software that takes over much of your computer processing time and use it to send spam or steal from others. The threat is real and right now. Worse,