Deck 11: Denial-Of-Service Attacks

Question 1

Some vulnerabilities cannot be closed by patching because there is an inherent bandwidth limit or active connection limit on all physical equipment and all software.

Answer 1

True

Question 2

The process table in UNIX permits a virtually infinite number of entries.

Answer 2

False

Question 3

Most legitimate Ping utilities do not allow you to send a ping of less than 64 KB.

Answer 3

False

Question 4

Computers that are connected to the Internet utilize DNS to resolve URLs.

Question 5

ICMP is used to handle errors and exchange control messages on a network.

Question 6

A(n) ____ occurs when the sysadmin has allowed the system to perform a variety of services without considering the system's limitations.

A)involuntary DoS
B)distributed DoS
C)isolated DoS
D)voluntary DoS

Question 7

____ attacks consume the limited resources of a computer or a network by transmitting a large number of packets as quickly as possible.

A)Software
B)Isolated
C)Flood
D)Void

Question 8

____ attacks exploit the existing software weaknesses. The effect is either degraded performance or crashes on the victim server.

A)Software
B)Flood
C)Voluntary
D)Isolated

Question 9

The ____ utility is used to determine if a specific machine located at a specific IP address is online.

A)Echo
B)Ping
C)ps
D)Alive

Question 10

In a ____ attack, a hacker sends to the target computer a packet that has the identical source and destination IP address as that of the target computer.

A)DNS overflow
B)Teardrop
C)Land
D)Chargen

Question 11

A(n) ______________________________ is a strategy designed to keep valid traffic from accessing the target of your attack.

Question 12

____________________ is a historical DoS attack in which the hacker uses the Ping utility to acquire access to a system.

Question 13

______________________________ is a database that maps domain names to IP addresses.

Question 14

____________________ attacks are like SMURF DoS attacks, but instead of using ICMP packets, they use UDP packets.

Question 15

A(n) ____________________ is a network of robot, or zombie, computers, which can harness their collective power to do considerable damage or send out huge amounts of junk e-mail.

Question 16

What are the main targets of DoS attacks and what do the attacks accomplish?

Question 17

Describe an example of a voluntary DoS attack.

Question 18

Under what conditions can a flood attack occur?