- (Topic 5)
When setting up a wireless network, an administrator enters a pre-shared key for security. Which of the following is true?

Correct Answer:A

- (Topic 6)
Doug is conducting a port scan of a target network. He knows that his client target network has a web server and that there is a mail server also which is up and running. Doug has been sweeping the network but has not been able to elicit any response from the remote target. Which of the following could be the most likely cause behind this lack of response? Select 4.

Correct Answer:ABCF
If the destination host or the destination network is down there is no way to get an answer and if TTL (Time To Live) is set too low the UDP packets will “die” before reaching the host because of too many hops between the scanning computer and the target. The TCP receive window size is the amount of received data (in bytes) that can be buffered during a connection. The sending host can send only that amount of data before it must wait for an acknowledgment and window update from the receiving host and ICMP is mainly used for echo requests and not in port scans.

- (Topic 3)
Trojan horse attacks pose one of the most serious threats to computer security. The image below shows different ways a Trojan can get into a system. Which are the easiest and most convincing ways to infect a computer?

Correct Answer:B

- (Topic 6)
Which address translation scheme would allow a single public IP address to always correspond to a single machine on an internal network, allowing "server publishing"?

Correct Answer:D
Mapping an unregistered IP address to a registered IP address on a one-to- one basis. Particularly useful when a device needs to be accessible from outside the network.

- (Topic 7)
Joseph was the Web site administrator for the Mason Insurance in New York, who's main Web site was located at www.masonins.com. Joseph uses his laptop computer regularly to administer the Web site.
One night, Joseph received an urgent phone call from his friend, Smith. According to Smith, the main Mason Insurance web site had been vandalized! All of its normal content was removed and replaced with an attacker's message ''Hacker Message: You are dead! Freaks!
From his office, which was directly connected to Mason Insurance's internal network, Joseph surfed to the Web site using his laptop. In his browser, the Web site looked completely intact. No changes were apparent. Joseph called a friend of his at his home to help troubleshoot the problem. The Web site appeared defaced when his friend visited using his DSL connection. So, while Smith and his friend could see the defaced page, Joseph saw the intact Mason Insurance web site. To help make sense of this problem, Joseph decided to access the Web site using his dial-up ISP. He disconnected his laptop from the corporate internal network and used his modem to dial up the same ISP used by Smith.
After his modem connected, he quickly typed www.masonins.com in his browser to reveal the following web page:
H@cker Mess@ge:
Y0u @re De@d! Fre@ks!
After seeing the defaced Web site, he disconnected his dial-up line, reconnected to the internal network, and used Secure Shell (SSH) to log in directly to the Web server. He ran Tripwire against the entire Web site, and determined that every system file and all the Web content on the server were intact.
How did the attacker accomplish this hack?

Correct Answer:C
External calls for the Web site has been redirected to another server by a successful DNS poisoning.

- (Topic 4)
The following is part of a log file taken from the machine on the network with the IP address of 192.168.1.106:
Time:Mar 13 17:30:15 Port:20 Source:192.168.1.103 Destination:192.168.1.106 Protocol:TCP
Time:Mar 13 17:30:17 Port:21 Source:192.168.1.103 Destination:192.168.1.106
Protocol:TCP
Time:Mar 13 17:30:19 Port:22 Source:192.168.1.103 Destination:192.168.1.106 Protocol:TCP
Time:Mar 13 17:30:21 Port:23 Source:192.168.1.103 Destination:192.168.1.106 Protocol:TCP
Time:Mar 13 17:30:22 Port:25 Source:192.168.1.103 Destination:192.168.1.106 Protocol:TCP
Time:Mar 13 17:30:23 Port:80 Source:192.168.1.103 Destination:192.168.1.106 Protocol:TCP
Time:Mar 13 17:30:30 Port:443 Source:192.168.1.103 Destination:192.168.1.106 Protocol:TCP
What type of activity has been logged?

Correct Answer:D