2014年6月26日星期四

Dernières EC-COUNCIL EC1-350 EC0-350 312-49v8 de la pratique de l'examen questions et réponses téléchargement gratuit

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Code d'Examen: EC1-350
Nom d'Examen: EC-COUNCIL (Ethical Hacking and Countermeasures V7)
Questions et réponses: 514 Q&As

Code d'Examen: EC0-350
Nom d'Examen: EC-COUNCIL (Ethical hacking and countermeasures)
Questions et réponses: 878 Q&As

Code d'Examen: 312-49v8
Nom d'Examen: EC-COUNCIL (Computer Hacking Forensic Investigator Exam)
Questions et réponses: 180 Q&As

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NO.1 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.2 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.3 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

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NO.4 A program that defends against a port scanner will attempt to:
A.Sends back bogus data to the port scanner
B.Log a violation and recommend use of security-auditing tools
C.Limit access by the scanning system to publicly available ports only
D.Update a firewall rule in real time to prevent the port scan from being completed
Correct:D

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NO.5 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

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NO.6 Lori has just been tasked by her supervisor toonduct vulnerability scan on the corporate
network.She has been instructed to perform a very thorough test of the network to ensure that
there are no security holes on any of the machines.Lori's company does not own any commercial
scanning products, so she decides to download a free one off the Internet.Lori has never done a
vulnerability scan before, so she is unsure of some of the settings available in the software she
downloaded.One of the options is to choose which ports that can be scanned.Lori wants to do
exactly what her boss has told her, but she does not know what ports should be scanned. If Lori is
supposed to scan all known TCP ports, how many ports should she select in the software?
A.65536
B.1024
C.1025
D.Lori should not scan TCP ports, only UDP ports
Correct:A

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NO.7 Samantha has been actively scanning the client network for which she is doing a vulnerability
assessment test. While doing a port scan she notices ports open in the 135 to 139 range. What
protocol is most likely to be listening on those ports?
A.FTP
B.SMB
C.Finger
D.Samba
Correct:B

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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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