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Exam 5: Port Scanning

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Question 21

Multiple Choice

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When using a port-scanner,what procedure can be conducted to identify which IP addresses belong to active hosts?

A) ping sweep
B) ping check
C) network sweep
D) ICMP probing

E) None of the above
F) A) and D)

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Question 22

Multiple Choice

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Match each item with a statement below. -Performed by port scanners to scan large networks to identify which IP addresses belong to active hosts

A) Nmap
B) Fping
C) Hping
D) Nessus
E) closed port
F) OpenVAS
G) filtered port
H) open port
I) port scanning
J) ping sweep

K) F) and J)
L) E) and I)

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Question 23

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Port scanning is a method of finding out which services a host computer offers.

To verify if all the IP addresses of a network are being used by computers that are up and running,you can use a port scanner to perform what procedure on a range of IP addresses?

Why is port scanning useful for hackers?

If subnetting is used in an organization,why should you be extra cautious when performing ping sweeps?

In a NULL scan,all packet flags are turned on.

In an ACK scan,if the attacked port returns an RST packet the attacked port is considered to be operating in what state?

Which of the following describes a flexible program that automates a task that takes too much time to perform manually?

What is a UDP scan?

What open-source network utility allows you to use plug-ins to run test programs (scripts) that can be selected from the client interface?

Which vi command deletes the current line?

Explain why an attacker typically uses an ACK scan to bypass a firewall?

What makes the OpenVAS tool flexible and unique?

Some attackers want to be hidden from network devices or IDSs that recognize an inordinate amount of pings or packets being sent to their networks.Which of the following attacks are more difficult to detect?

In any *NIX system,after saving a script named "script_name," you need to make it executable so that you can run it.Which command will accomplish this task from the command line?

What type of port scan is similar to a SYN scan and is risky to use because it relies on the attacked computer's OS?

Match each item with a statement below. -An open-source fork of Nessus

Match each item with a statement below. -A port state that may indicate a firewall is being used to allow specified traffic into or out of the network

One of the limitations when using "ping sweeps" is that many network administrators configure nodes not to respond to ICMP Echo Requests.What type of ICMP Echo message is being disabled by these administrators?