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Q171. Dan is conducting a penetration testing and has found a vulnerability in a Web Application which gave him the sessionID token via a cross site scripting vulnerability. Dan wants to replay this token. However, the session ID manager (on the server) checks the originating IP address as well. Dan decides to spoof his IP address in order to replay the sessionID. Why do you think Dan might not be able to get an interactive session? 

A. Dan cannot spoof his IP address over TCP network 

B. The server will send replies back to the spoofed IP address 

C. Dan can establish an interactive session only if he uses a NAT 

D. The scenario is incorrect as Dan can spoof his IP and get responses 


Explanation: Spoofing your IP address is only effective when there is no need to establish a two way connection as all traffic meant to go to the attacker will end up at the place of the spoofed address. 

Q172. Which of the following is an automated vulnerability assessment tool. 

A. Whack a Mole 

B. Nmap 

C. Nessus 

D. Kismet 

E. Jill32 


Explanation: Nessus is a vulnerability assessment tool. 

Q173. What is a NULL scan? 

A. A scan in which all flags are turned off 

B. A scan in which certain flags are off 

C. A scan in which all flags are on 

D. A scan in which the packet size is set to zero 

E. A scan with a illegal packet size 


Explanation: A null scan has all flags turned off. 

Q174. A network admin contacts you. He is concerned that ARP spoofing or poisoning might occur on his network. What are some things he can do to prevent it? 

Select the best answers. 

A. Use port security on his switches. 

B. Use a tool like ARPwatch to monitor for strange ARP activity. 

C. Use a firewall between all LAN segments. 

D. If you have a small network, use static ARP entries. 

E. Use only static IP addresses on all PC's. 

Answer: ABD


By using port security on his switches, the switches will only allow the first MAC address that is connected to the switch to use that port, thus preventing ARP spoofing. ARPWatch is a tool that monitors for strange ARP activity. This may help identify ARP spoofing when it happens. Using firewalls between all LAN segments is possible and may help, but is usually pretty unrealistic. On a very small network, static ARP entries are a possibility. However, on a large network, this is not an realistic option. ARP spoofing doesn't have anything to do with static or dynamic IP addresses. Thus, this option won't help you. 

Q175. What does the following command in netcat do? 

nc -l -u -p 55555 < /etc/passwd 

A. logs the incoming connections to /etc/passwd file 

B. loads the /etc/passwd file to the UDP port 55555 

C. grabs the /etc/passwd file when connected to UDP port 55555 

D. deletes the /etc/passwd file when connected to the UDP port 55555 

Answer: C

Explanation: -l forces netcat to listen for incoming connections. 

-u tells netcat to use UDP instead of TCP 

-p 5555 tells netcat to use port 5555 

< /etc/passwd tells netcat to grab the /etc/passwd file when connected to. 

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Q176. Which of the following represents the initial two commands that an IRC client sends to join an IRC network? 






Explanation: A "PASS" command is not required for either client or server connection to be registered, but it must precede the server message or the latter of the NICK/USER combination. (RFC 1459) 

Q177. Exhibit: * Missing* 

Jason's Web server was attacked by a trojan virus. He runs protocol analyzer and notices that the trojan communicates to a remote server on the Internet. Shown below is the standard "hexdump" representation of the network packet, before being decoded. Jason wants to identify the trojan by looking at the destination port number and mapping to a trojan-port number database on the Internet. Identify the remote server's port number by decoding the packet? 

A. Port 1890 (Net-Devil Trojan) 

B. Port 1786 (Net-Devil Trojan) 

C. Port 1909 (Net-Devil Trojan) 

D. Port 6667 (Net-Devil Trojan) 

Answer: D

Explanation: From trace, 0x1A0B is 6667, IRC Relay Chat, which is one port used. Other ports are in the 900's. 

Q178. Fingerprinting an Operating System helps a cracker because: 

A. It defines exactly what software you have installed 

B. It opens a security-delayed window based on the port being scanned 

C. It doesn't depend on the patches that have been applied to fix existing security holes 

D. It informs the cracker of which vulnerabilities he may be able to exploit on your system 

Answer: D

Explanation: When a cracker knows what OS and Services you use he also knows which exploits might work on your system. If he would have to try all possible exploits for all possible Operating Systems and Services it would take too long time and the possibility of being detected increases. 

Q179. Which of the following LM hashes represent a password of less than 8 characters? (Select 2) 

A. BA810DBA98995F1817306D272A9441BB 

B. 44EFCE164AB921CQAAD3B435B51404EE 

C. 0182BD0BD4444BF836077A718CCDF409 

D. CEC52EB9C8E3455DC2265B23734E0DAC 

E. B757BF5C0D87772FAAD3B435B51404EE 

F. E52CAC67419A9A224A3B108F3FA6CB6D 

Answer: BE

Explanation: Notice the last 8 characters are the same 

Q180. You ping a target IP to check if the host is up. You do not get a response. You suspect ICMP is blocked at the firewall. Next you use hping2 tool to ping the target host and you get a response. Why does the host respond to hping2 and not ping packet? 

[ceh]# ping 

PING ( from : 56(84) bytes of data. 

--- ping statistics ---

3 packets transmitted, 0 packets received, 100% packet loss 

[ceh]# ./hping2 -c 4 -n -i 2 

HPING (eth0 NO FLAGS are set, 40 headers + 

0 data bytes 

len=46 ip= flags=RA seq=0 ttl=128 id=54167 win=0 rtt=0.8 ms 

len=46 ip= flags=RA seq=1 ttl=128 id=54935 win=0 rtt=0.7 ms 

len=46 ip= flags=RA seq=2 ttl=128 id=55447 win=0 rtt=0.7 ms 

len=46 ip= flags=RA seq=3 ttl=128 id=55959 win=0 rtt=0.7 ms 

--- hping statistic ---

4 packets tramitted, 4 packets received, 0% packet loss 

round-trip min/avg/max = 0.7/0.8/0.8 ms 

A. ping packets cannot bypass firewalls 

B. you must use ping switch 

C. hping2 uses TCP instead of ICMP by default 

D. hping2 uses stealth TCP packets to connect 

Answer: C

Explanation: Default protocol is TCP, by default hping2 will send tcp headers to target host's port 0 with a winsize of 64 without any tcp flag on. Often this is the best way to do an 'hide ping', useful when target is behind a firewall that drop ICMP. Moreover a tcp null-flag to port 0 has a good probability of not being logged. 

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