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Code d'Examen: ECSS
Nom d'Examen: EC-COUNCIL (EC-Council Certified Security Specialist Practice Test)
Questions et réponses: 337 Q&As
Code d'Examen: 412-79
Nom d'Examen: EC-COUNCIL (EC-Council Certified Security Analyst (ECSA))
Questions et réponses: 74 Q&As
Code d'Examen: EC0-350
Nom d'Examen: EC-COUNCIL (Ethical hacking and countermeasures)
Questions et réponses: 878 Q&As
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NO.1 What is the purpose of firewalking?
A.It's a technique used to map routers on a network link
B.It's a technique used to discover Wireless network on foot
C.It's a technique used to discover interface in promiscuous mode
D.It's a technique used to discover what rules are configured on a gateway
Correct:D
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NO.2 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
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NO.3 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
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NO.4 Clive is conducting a pen-test and has just port scanned a system on the network. He has
identified the operating system as Linux and been able to elicit responses from ports 23, 25 and
53. He infers port 23 as running Telnet service, port 25 as running SMTP service and port 53 as
running DNS service. The client confirms these findings and attests to the current availability of
the services. When he tries to telnet to port 23 or 25, he gets a blank screen in response. On
typing other commands, he sees only blank spaces or underscores symbols on the screen. What
are you most likely to infer from this?
A.The services are protected by TCP wrappers
B.There is a honeypot running on the scanned machine
C.An attacker has replaced the services with trojaned ones
D.This indicates that the telnet and SMTP server have crashed
Correct:A
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NO.5 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
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NO.6 Which programming language is NOT vulnerable to buffer overflow attacks?
A.Java
B.ActiveX
C.C++
D.Assembly Language
Correct:A
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NO.7 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
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NO.8 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
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