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Q281. Attackers send an ACK probe packet with random sequence number, no response means port is filtered (Stateful firewall is present) and RST response means the port is not filtered. What type of Port Scanning is this?
A. RST flag scanning
B. FIN flag scanning
C. SYN flag scanning
D. ACK flag scanning
Answer: D
Q282. This is an example of whois record.
Sometimes a company shares a little too much information on their organization through public domain records. Based on the above whois record, what can an attacker do? (Select 2 answers)
A. Search engines like Google, Bing will expose information listed on the WHOIS record
B. An attacker can attempt phishing and social engineering on targeted individuals using the information from WHOIS record
C. Spammers can send unsolicited e-mails to addresses listed in the WHOIS record
D. IRS Agents will use this information to track individuals using the WHOIS record information
Answer: BC
Q283. What are the four steps is used by nmap scanning?
A. DNS Lookup
B. ICMP Message
C. Ping
D. Reverse DNS lookup
E. TCP three way handshake
F. The Actual nmap scan
Answer: ACDF
Explanation: Nmap performs four steps during a normal device scan. Some of these steps can be modified or disabled using options on the nmap command line.
Q284. Jake works as a system administrator at Acme Corp. Jason, an accountant of the firm befriends him at the canteen and tags along with him on the pretext of appraising him about potential tax benefits. Jason waits for Jake to swipe his access card and follows him through the open door into the secure systems area. How would you describe Jason's behavior within a security context?
A. Trailing
B. Tailgating
C. Swipe Gating
D. Smooth Talking
Answer: B
Explanation: Tailgating, in which an unauthorized person follows someone with a pass into an office, is a very simple social engineering attack. The intruder opens the door, which the authorized user walks through, and then engages them in conversation about the weather or weekend sport while they walk past the reception area together.
Q285. Attackers can potentially intercept and modify unsigned SMB packets, modify the traffic and forward it so that the server might perform undesirable actions. Alternatively, the attacker could pose as the server or client after a legitimate authentication and gain unauthorized access to data. Which of the following is NOT a means that can be used to minimize or protect against such an attack?
A. Timestamps
B. SMB Signing
C. File permissions
D. Sequence numbers monitoring
Answer: ABD
Q286. 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
Q287. What does ICMP (type 11, code 0) denote?
A. Unknown Type
B. Time Exceeded
C. Source Quench
D. Destination Unreachable
Answer: B
Explanation: An ICMP Type 11, Code 0 means Time Exceeded [RFC792], Code 0 = Time to Live exceeded in Transit and Code 1 = Fragment Reassembly Time Exceeded.
Q288. Your are trying the scan a machine located at ABC company’s LAN named mail.abc.com. Actually that machine located behind the firewall. Which port is used by nmap to send the TCP synchronize frame to on mail.abc.com?
A. 443
B. 80
C. 8080
D. 23
Answer: A
Q289. You want to know whether a packet filter is in front of 192.168.1.10. Pings to 192.168.1.10 don't get answered. A basic nmap scan of 192.168.1.10 seems to hang without returning any information. What should you do next?
A. Use NetScan Tools Pro to conduct the scan
B. Run nmap XMAS scan against 192.168.1.10
C. Run NULL TCP hping2 against 192.168.1.10
D. The firewall is blocking all the scans to 192.168.1.10
Answer: C
Q290. Jim’s Organization just completed a major Linux roll out and now all of the organization’s systems are running Linux 2.5 Kernel. The roll out expenses has posed constraints on purchasing other essential security equipment and software. The organization requires an option to control network traffic and also perform stateful inspection of traffic going into and out of the DMZ, which built-in functionality of Linux can achieve this?
A. IP ICMP
B. IP Sniffer
C. IP tables
D. IP Chains
Answer: C
Explanation: iptables is the name of the user space tool by which administrators create rules for the packet filtering and NAT modules. While technically iptables is merely the tool which controls the packet filtering and NAT components within the kernel, the name iptables is often used to refer to the entire infrastructure, including netfilter, connection tracking and NAT, as well as the tool itself. iptables is a standard part of all modern Linux distributions.