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Q141. Bob has set up three web servers on Windows Server 2003 IIS 6.0. Bob has followed all the recommendations for securing the operating system and IIS. These servers are going to run numerous e-commerce websites that are projected to bring in thousands of dollars a day. Bob is still concerned about the security of this server because of the potential for financial loss. Bob has asked his company’s firewall administrator to set the firewall to inspect all incoming traffic on ports 80 and 443 to ensure that no malicious data is getting into the network.
Why will this not be possible?
A. Firewalls can’t inspect traffic coming through port 443
B. Firewalls can only inspect outbound traffic
C. Firewalls can’t inspect traffic coming through port 80
D. Firewalls can’t inspect traffic at all, they can only block or allow certain ports
Answer: D
Explanation: In order to really inspect traffic and traffic patterns you need an IDS.
Q142. John wishes to install a new application onto his Windows 2000 server.
He wants to ensure that any application he uses has not been Trojaned.
What can he do to help ensure this?
A. Compare the file's MD5 signature with the one published on the distribution media
B. Obtain the application via SSL
C. Compare the file's virus signature with the one published on the distribution media
D. Obtain the application from a CD-ROM disc
Answer: A
Explanation: MD5 was developed by Professor Ronald L. Rivest of MIT. What it does, to quote the executive summary of rfc1321, is:
[The MD5 algorithm] takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. It is conjectured that it is computationally infeasible to produce two messages having the same message digest, or to produce any message having a given prespecified target message digest. The MD5 algorithm is intended for digital signature applications, where a large file must be "compressed" in a secure manner before being encrypted with a private (secret) key under a public-key cryptosystem such as RSA.
In essence, MD5 is a way to verify data integrity, and is much more reliable than checksum and many other commonly used methods.
Q143. You are the security administrator for a large online auction company based out of Los Angeles. After getting your ENSA CERTIFICATION last year, you have steadily been fortifying your network’s security including training OS hardening and network security. One of the last things you just changed for security reasons was to modify all the built-in administrator accounts on the local computers of PCs and in Active Directory. After through testing you found and no services or programs were affected by the name changes.
Your company undergoes an outside security audit by a consulting company and they said that even through all the administrator account names were changed, the accounts could still be used by a clever hacker to gain unauthorized access. You argue with the auditors and say that is not possible, so they use a tool and show you how easy it is to utilize the administrator account even though its name was changed.
What tool did the auditors use?
A. sid2user
B. User2sid
C. GetAcct
D. Fingerprint
Answer: A
Explanation: User2sid.exe can retrieve a SID from the SAM (Security Accounts Manager) from the local or a remote machine Sid2user.exe can then be used to retrieve the names of all the user accounts and more.
Q144. Neil is an IT security consultant working on contract for Davidson Avionics. Neil has been hired to audit the network of Davidson Avionics. He has been given permission to perform any tests necessary. Neil has created a fake company ID badge and uniform. Neil waits by one of the company's entrance doors and follows an employee into the office after they use their valid access card to gain entrance. What type of social engineering attack has Neil employed here?
A. Neil has used a tailgating social engineering attack to gain access to the offices
B. He has used a piggybacking technique to gain unauthorized access
C. This type of social engineering attack is called man trapping
D. Neil is using the technique of reverse social engineering to gain access to the offices of Davidson Avionics
Answer: A
Q145. What is the goal of a Denial of Service Attack?
A. Capture files from a remote computer.
B. Render a network or computer incapable of providing normal service.
C. Exploit a weakness in the TCP stack.
D. Execute service at PS 1009.
Answer: B
Explanation: In computer security, a denial-of-service attack (DoS attack) is an attempt to make a computer resource unavailable to its intended users. Typically the targets are high-profile web servers, and the attack attempts to make the hosted web pages unavailable on the Internet. It is a computer crime that violates the Internet proper use policy as indicated by the Internet Architecture Board (IAB).
Q146. Simon is security analyst writing signatures for a Snort node he placed internally that captures all mirrored traffic from his border firewall. From the following signature, what will Snort look for in the payload of the suspected packets?
alert tcp $EXTERNAL_NET any -> $HOME_NET 27374 (msg: "BACKDOOR SIG - SubSseven 22";flags: A+; content: "|0d0a5b52504c5d3030320d0a|"; reference:arachnids,485;) alert
A. The payload of 485 is what this Snort signature will look for.
B. Snort will look for 0d0a5b52504c5d3030320d0a in the payload.
C. Packets that contain the payload of BACKDOOR SIG - SubSseven 22 will be flagged.
D. From this snort signature, packets with HOME_NET 27374 in the payload will be flagged.
Answer: B
Q147. This attack uses social engineering techniques to trick users into accessing a fake Web site and divulging personal information. Attackers send a legitimate-looking e-mail asking users to update their information on the company's Web site, but the URLs in the e-mail actually point to a false Web site.
A. Wiresharp attack
B. Switch and bait attack
C. Phishing attack
D. Man-in-the-Middle attack
Answer: C
Q148. Bob is a Junior Administrator at ABC Company. On One of Linux machine he entered the following firewall rules:
iptables –t filter –A INPUT -p tcp --dport 23 –j DROP
Why he entered the above line?
A. To accept the Telnet connection
B. To deny the Telnet connection
C. The accept all connection except telnet connection
D. None of Above
Answer: B
Explanation: -t, --table
This option specifies the packet matching table which the command should operate on. If the kernel is configured with automatic module loading, an attempt will be made to load the appropriate module for that table if it is not already there. The tables are as follows: filter This is the default table, and contains the built-in chains INPUT (for packets coming into the box itself), FORWARD (for packets being routed through the box), and OUTPUT (for locally-generated packets). nat This table is consulted when a packet which is creates a new connection is encountered. It consists of three built-ins: PREROUTING (for altering packets as soon as they come in), OUTPUT (for altering locally-generated packets before routing), and POSTROUTING (for altering packets as they are about to go out). mangle This table is used for specialized packet alteration. It has two built-in chains: PREROUTING (for altering incoming packets before routing) and OUTPUT (for altering locally-generated packets before routing).
-A, --append
Append one or more rules to the end of the selected chain. When the source and/or destination names resolve to more than one address, a rule will be added for each possible address combination. -p, --protocol [!] protocol The protocol of the rule or of the packet to check. The specified protocol can be one of tcp, udp, icmp, or all, or it can be a numeric value, representing one of these protocols or a different one. Also a protocol name from /etc/protocols is allowed. A "!" argument before the protocol inverts the test. The number zero is equivalent to all. Protocol all will match with all protocols and is taken as default when this option is omitted. All may not be used in in combination with the check command. --destination-port [!] [port[:port]] Destination port or port range specification. The flag --dport is an alias for this option. -j, --jump target
This specifies the target of the rule; ie. what to do if the packet matches it. The target can be a user-defined chain (not the one this rule is in), one of the special builtin targets which decide the fate of the packet immediately, or an extension (see EXTENSIONS below). If this option is omitted in a rule, then matching the rule will have no effect on the packet's fate, but the counters on the rule will be incremented.
Q149. Which of the following Nmap commands would be used to perform a stack fingerprinting?
A. Nmap -O -p80 <host(s.>
B. Nmap -hU -Q<host(s.>
C. Nmap -sT -p <host(s.>
D. Nmap -u -o -w2 <host>
E. Nmap -sS -0p target
Answer: A
Explanation: This option activates remote host identification via TCP/IP fingerprinting. In other words, it uses a bunch of techniques to detect subtlety in the underlying operating system network stack of the computers you are scanning. It uses this information to create a "fingerprint" which it compares with its database of known OS fingerprints (the nmap-os-fingerprints file. to decide what type of system you are scanning.
Q150. How many bits encryption does SHA-1 use?
A. 64 bits
B. 128 bits
C. 160 bits
D. 256 bits
Answer: C
Explanation: SHA-1 (as well as SHA-0) produces a 160-bit digest from a message with a maximum length of 264 - 1 bits, and is based on principles similar to those used by Professor Ronald L. Rivest of MIT in the design of the MD4 and MD5 message digest algorithms.