EC-COUNCIL Certified Ethical Hacker EC0-350
1.Samuel is the network administrator of DataX Communications, Inc. He is trying to configure his
firewall to block password brute force attempts on his network. He enables blocking the intruder's
IP address for a period of 24 hours time after more than three unsuccessful attempts. He is
confident that this rule will secure his network from hackers on the Internet. But he still receives
hundreds of thousands brute-force attempts generated from various IP addresses around the
world. After some investigation he realizes that the intruders are using a proxy somewhere else
on the Internet which has been scripted to enable the random usage of various proxies on each
request so as not to get caught by the firewall rule. Later he adds another rule to his firewall and
enables small sleep on the password attempt so that if the password is incorrect, it would take 45
seconds to return to the user to begin another attempt. Since an intruder may use multiple
machines to brute force the password, he also throttles the number of connections that will be
prepared to accept from a particular IP address. This action will slow the intruder's attempts.
Samuel wants to completely block hackers brute force attempts on his network. What are the
alternatives to defending against possible brute-force password attacks on his site?
A.Enforce a password policy and use account lockouts after three wrong logon attempts even though this
might lock out legit users
B.Enable the IDS to monitor the intrusion attempts and alert you by e-mail about the IP address of the
intruder so that you can block them at the Firewall manually
C.Enforce complex password policy on your network so that passwords are more difficult to brute force
D.You cannot completely block the intruders attempt if they constantly switch proxies
Correct:D
2.Which programming language is NOT vulnerable to buffer overflow attacks?
A.Java
B.ActiveX
C.C++
D.Assembly Language
Correct:A
3.A client has approached you with a penetration test requirement. They are concerned with the
possibility of external threat, and have invested considerable resources in protecting their
Internet exposure. However, their main concern is the possibility of an employee elevating his/her
privileges and gaining access to information outside of their department. What kind of penetration
test would you recommend that would best address the client's concern?
A.A Grey Hat test
B.A Grey Box test
C.A Black Hat test
D.A White Hat test
E.A Black Box test
F.A White Box test
Correct:B
4.What type of port scan is shown below? Scan directed at open port: ClientServer
192.5.2.92:4079 ---------FIN--------->192.5.2.110:23 192.5.2.92:4079 <----NO
RESPONSE------192.5.2.110:23 Scan directed at closed port: ClientServer 192.5.2.92:4079
---------FIN--------->192.5.2.110:23 192.5.2.92:4079<-----RST/ACK----------192.5.2.110:23
A.Idle Scan
B.FIN Scan
C.XMAS Scan
D.Windows Scan
Correct:B
5.Which of the following built-in C/C++ functions you should avoid to prevent your program from
buffer overflow attacks?
A.strcpy()
B.strcat()
C.streadd()
D.strsock()
Correct:A B C
6.Bob is acknowledged as a hacker of repute and is popular among visitors of 'underground' sites.
Bob is willing to share his knowledge to those who are willing to learn, and many have expressed
their interest in learning from him. However, this knowledge has risks associated with it, as the
same knowledge can be used for malevolent attacks as well. In this context, what would be the
most effective method to bridge the knowledge gap between the "black" hats or crackers and the
"white" hats or computer security professionals?
A.Hire more computer security monitoring personnel to monitor computer systems and networks
B.Educate everyone with books, articles and training on risk analysis, vulnerabilities and safeguards
C.Train more national guard and reservist in the art of computer security to help out in times of emergency
or crises
D.Make obtaining either a computer security certification or accreditation easier to achieve so more
individuals feel that they are a part of something larger than life
Correct:B
7.After a client sends a connection request (SYN) packet to the server, the server will respond
(SYN-ACK) with a sequence number of its choosing, which then must be acknowledged (ACK) by
the client. This sequence number is predictable; the attack connects to a service first with its own
IP address, records the sequence number chosen, and then opens a second connection from a
forged IP address. The attack doesn't see the SYN-ACK (or any other packet) from the server, but
can guess the correct responses. If the source IP address is used for authentication, then the
attacker can use the one-sided communication to break into the server. What attacks can you
successfully launch against a server using the above technique?
A.Session Hijacking attacks
B.Denial of Service attacks
C.Web page defacement attacks
D.IP spoofing attacks
Correct:A
8.Eric notices repeated probes to port 1080. He learns that the protocol being used is designed to
allow a host outside of a firewall to connect transparently and securely through the firewall. He
wonders if his firewall has been breached. What would be your inference?
A.Eric's network has been penetrated by a firewall breach
B.The attacker is using the ICMP protocol to have a covert channel
C.Eric has a Wingate package providing FTP redirection on his network
D.Somebody is using SOCKS on the network to communicate through the firewall
Correct:D
9.Mark works as a contractor for the Department of Defense and is in charge of network security.
He has spent the last month securing access to his network from all possible entry points. He has
segmented his network into several subnets and has installed firewalls all over the network. He
has placed very stringent rules on all the firewalls, blocking everything in and out except ports
that must be used. He does need to have port 80 open since his company hosts a website that
must be accessed from the Internet. Mark is fairly confident of his perimeter defenses, but is still
worried about programs like Hping2 that can get into a network through covert channels. How
should mark protect his network from an attacker using Hping2 to scan his internal network?
A.Block ICMP type 13 messages
B.Block all incoming traffic on port 53
C.Block all outgoing traffic on port 53
D.Use stateful inspection on the firewalls
Correct:A
10.Bill has started to notice some slowness on his network when trying to update his company's
website and while trying to access the website from the Internet. Bill asks the help desk manager
if he has received any calls about slowness from the end users, but the help desk manager says
that he has not. Bill receives a number of calls from customers that cannot access the company
website and cannot purchase anything online. Bill logs on to a couple of his routers and notices
that the logs show network traffic is at an all time high.?He also notices that almost all the traffic
is originating from a specific address. Bill decides to use Geotrace to find out where the suspect
IP is originates from. The Geotrace utility runs a traceroute and finds that the IP is coming from
Panama.?Bill knows that none of his customers are in Panama so he immediately thinks that his
company is under a Denial of Service attack. Now Bill needs to find out more about the originating
IP address. What Internet registry should Bill look in to find the IP address?
A.LACNIC
B.ARIN
C.RIPE LACNIC
D.APNIC
Correct:A
1.Samuel is the network administrator of DataX Communications, Inc. He is trying to configure his
firewall to block password brute force attempts on his network. He enables blocking the intruder's
IP address for a period of 24 hours time after more than three unsuccessful attempts. He is
confident that this rule will secure his network from hackers on the Internet. But he still receives
hundreds of thousands brute-force attempts generated from various IP addresses around the
world. After some investigation he realizes that the intruders are using a proxy somewhere else
on the Internet which has been scripted to enable the random usage of various proxies on each
request so as not to get caught by the firewall rule. Later he adds another rule to his firewall and
enables small sleep on the password attempt so that if the password is incorrect, it would take 45
seconds to return to the user to begin another attempt. Since an intruder may use multiple
machines to brute force the password, he also throttles the number of connections that will be
prepared to accept from a particular IP address. This action will slow the intruder's attempts.
Samuel wants to completely block hackers brute force attempts on his network. What are the
alternatives to defending against possible brute-force password attacks on his site?
A.Enforce a password policy and use account lockouts after three wrong logon attempts even though this
might lock out legit users
B.Enable the IDS to monitor the intrusion attempts and alert you by e-mail about the IP address of the
intruder so that you can block them at the Firewall manually
C.Enforce complex password policy on your network so that passwords are more difficult to brute force
D.You cannot completely block the intruders attempt if they constantly switch proxies
Correct:D
2.Which programming language is NOT vulnerable to buffer overflow attacks?
A.Java
B.ActiveX
C.C++
D.Assembly Language
Correct:A
3.A client has approached you with a penetration test requirement. They are concerned with the
possibility of external threat, and have invested considerable resources in protecting their
Internet exposure. However, their main concern is the possibility of an employee elevating his/her
privileges and gaining access to information outside of their department. What kind of penetration
test would you recommend that would best address the client's concern?
A.A Grey Hat test
B.A Grey Box test
C.A Black Hat test
D.A White Hat test
E.A Black Box test
F.A White Box test
Correct:B
4.What type of port scan is shown below? Scan directed at open port: ClientServer
192.5.2.92:4079 ---------FIN--------->192.5.2.110:23 192.5.2.92:4079 <----NO
RESPONSE------192.5.2.110:23 Scan directed at closed port: ClientServer 192.5.2.92:4079
---------FIN--------->192.5.2.110:23 192.5.2.92:4079<-----RST/ACK----------192.5.2.110:23
A.Idle Scan
B.FIN Scan
C.XMAS Scan
D.Windows Scan
Correct:B
5.Which of the following built-in C/C++ functions you should avoid to prevent your program from
buffer overflow attacks?
A.strcpy()
B.strcat()
C.streadd()
D.strsock()
Correct:A B C
6.Bob is acknowledged as a hacker of repute and is popular among visitors of 'underground' sites.
Bob is willing to share his knowledge to those who are willing to learn, and many have expressed
their interest in learning from him. However, this knowledge has risks associated with it, as the
same knowledge can be used for malevolent attacks as well. In this context, what would be the
most effective method to bridge the knowledge gap between the "black" hats or crackers and the
"white" hats or computer security professionals?
A.Hire more computer security monitoring personnel to monitor computer systems and networks
B.Educate everyone with books, articles and training on risk analysis, vulnerabilities and safeguards
C.Train more national guard and reservist in the art of computer security to help out in times of emergency
or crises
D.Make obtaining either a computer security certification or accreditation easier to achieve so more
individuals feel that they are a part of something larger than life
Correct:B
7.After a client sends a connection request (SYN) packet to the server, the server will respond
(SYN-ACK) with a sequence number of its choosing, which then must be acknowledged (ACK) by
the client. This sequence number is predictable; the attack connects to a service first with its own
IP address, records the sequence number chosen, and then opens a second connection from a
forged IP address. The attack doesn't see the SYN-ACK (or any other packet) from the server, but
can guess the correct responses. If the source IP address is used for authentication, then the
attacker can use the one-sided communication to break into the server. What attacks can you
successfully launch against a server using the above technique?
A.Session Hijacking attacks
B.Denial of Service attacks
C.Web page defacement attacks
D.IP spoofing attacks
Correct:A
8.Eric notices repeated probes to port 1080. He learns that the protocol being used is designed to
allow a host outside of a firewall to connect transparently and securely through the firewall. He
wonders if his firewall has been breached. What would be your inference?
A.Eric's network has been penetrated by a firewall breach
B.The attacker is using the ICMP protocol to have a covert channel
C.Eric has a Wingate package providing FTP redirection on his network
D.Somebody is using SOCKS on the network to communicate through the firewall
Correct:D
9.Mark works as a contractor for the Department of Defense and is in charge of network security.
He has spent the last month securing access to his network from all possible entry points. He has
segmented his network into several subnets and has installed firewalls all over the network. He
has placed very stringent rules on all the firewalls, blocking everything in and out except ports
that must be used. He does need to have port 80 open since his company hosts a website that
must be accessed from the Internet. Mark is fairly confident of his perimeter defenses, but is still
worried about programs like Hping2 that can get into a network through covert channels. How
should mark protect his network from an attacker using Hping2 to scan his internal network?
A.Block ICMP type 13 messages
B.Block all incoming traffic on port 53
C.Block all outgoing traffic on port 53
D.Use stateful inspection on the firewalls
Correct:A
10.Bill has started to notice some slowness on his network when trying to update his company's
website and while trying to access the website from the Internet. Bill asks the help desk manager
if he has received any calls about slowness from the end users, but the help desk manager says
that he has not. Bill receives a number of calls from customers that cannot access the company
website and cannot purchase anything online. Bill logs on to a couple of his routers and notices
that the logs show network traffic is at an all time high.?He also notices that almost all the traffic
is originating from a specific address. Bill decides to use Geotrace to find out where the suspect
IP is originates from. The Geotrace utility runs a traceroute and finds that the IP is coming from
Panama.?Bill knows that none of his customers are in Panama so he immediately thinks that his
company is under a Denial of Service attack. Now Bill needs to find out more about the originating
IP address. What Internet registry should Bill look in to find the IP address?
A.LACNIC
B.ARIN
C.RIPE LACNIC
D.APNIC
Correct:A