Exam 11: Denial-Of-Service Attacks

Under what conditions can a flood attack occur?

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

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

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

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

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

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

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.

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

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

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

Describe an example of a voluntary DoS attack.

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

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

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

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.

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