Deck 22: Understanding Firewalls

Question 1

A good way to keep hackers out of a computer is to install a(n) ________.

Answer 1

firewall

Question 2

A program installed by hackers that allows them to take almost complete control of your computer without your knowledge is called a(n) ________ program.

Answer 2

backdoor; rootkit

Question 3

A game or screen saver that appears desirable or useful but when it runs does something malicious is called a(n) ________.

Answer 3

Trojan horse

Question 4

________ floods a computer with requests until it shuts down denying access to legitimate users.

A) An encryption virus
B) A DoS attack
C) A polymorphic virus
D) Port blocking

Question 5

Anyone who unlawfully breaks into an individual computer or a computer network is called a(n) ________.

Question 6

Virtual communications gateways that allow a computer to accept requests for information from other networks or computers are called ________.

A) open ports
B) e-mails
C) a botnet
D) logical ports

Question 7

Match each of the following terms to its definition:
I. packet filtering
II. zombie
III. firewall
IV. network address translation
V. packet sniffer
A. technique of assigning hidden internal IP addresses to protect a network against hackers
B. method for selectively allowing certain requests to access a port
C. hardware or software for protecting computers from hackers
D. a computer controlled by a hacker
E. program used by hackers to look at individual packets as they travel on the Internet

Question 8

Hackers can use packet ________ to capture valuable information, then sell or use the information illegally.

A) interceptors
B) intruders
C) sniffers
D) filters

Question 9

Attacks that are launched from multiple zombie computers at the same time are called ________.

A) Trojan horses
B) distributed denial-of-service attacks (DDoS)
C) worms
D) script kiddies

Question 10

A firewall designed specifically for home networks is called a ________ firewall.

A) home
B) personal
C) logical
D) static

Question 11

Match each of the following terms to its meaning:
I. firewall
II. hacker
III. packet
IV. botnet
V. virus
A. prevents intrusion into your computer
B. a small program that can compromise a computer system
C. small piece of data that travels through the Internet
D. a person who poses a threat to your computer
E. group of software programs that usually run independently on a large number of zombie computers

Question 12

________ is characterized by someone using personal information about you (such as your name or Social Security number) for the purpose of defrauding others.

Question 13

A large group of software programs that runs autonomously on zombie computers is called a(n) ________.

Question 14

Using a ________, you can screen data coming into the logical ports to see if it comes from a trusted source.

A) packet sniffer
B) DDoS
C) packet filter
D) token

Question 15

ShieldsUP and LeakTest are software programs you can use to test whether ________.

A) your firewall is working correctly
B) your computer is a zombie
C) you have a memory leak
D) packets arrive at their intended destinations

Question 16

Which of the following is a program that appears to be something useful or desirable but does something malicious in the background?

A) A bot
B) A Trojan horse
C) A worm
D) A zombie