[Free] 2018(Jan) EnsurePass Dumpsleader ECCouncil EC0-350 Dumps with VCE and PDF 191-200

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Ethical Hacking and Countermeasures V8

Question No: 191 – (Topic 2)

When a normal TCP connection starts, a destination host receives a SYN (synchronize/start) packet from a source host and sends back a SYN/ACK (synchronize acknowledge). The destination host must then hear an ACK (acknowledge) of the SYN/ACK before the connection is established. This is referred to as the quot;TCP three-way handshake.quot; While waiting for the ACK to the SYN ACK, a connection queue of finite size on the destination host keeps track of connections waiting to be completed. This queue typically empties quickly since the ACK is expected to arrive a few milliseconds after the SYN ACK. How would an attacker exploit this design by launching TCP SYN attack?

  1. Attacker generates TCP SYN packets with random destination addresses towards a victim host

  2. Attacker floods TCP SYN packets with random source addresses towards a victim host

  3. Attacker generates TCP ACK packets with random source addresses towards a victim host

  4. Attacker generates TCP RST packets with random source addresses towards a victim host

Answer: B

Question No: 192 – (Topic 2)

In Trojan terminology, what is a covert channel?

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  1. A channel that transfers information within a computer system or network in a way that

    violates the security policy

  2. A legitimate communication path within a computer system or network for transfer of data

  3. It is a kernel operation that hides boot processes and services to mask detection

  4. It is Reverse tunneling technique that uses HTTPS protocol instead of HTTP protocol to establish connections

Answer: A

Question No: 193 – (Topic 2)

What type of attack is shown here?

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  1. Bandwidth exhaust Attack

  2. Denial of Service Attack

  3. Cluster Service Attack

  4. Distributed Denial of Service Attack

Answer: D Explanation:

We think this is a DDoS attack not DoS because the attack is initialed in multiple zombies not single machine.

Question No: 194 – (Topic 2)

In this type of Man-in-the-Middle attack, packets and authentication tokens are captured using a sniffer. Once the relevant information is extracted, the tokens are placed back on the network to gain access.

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  1. Token Injection Replay attacks

  2. Shoulder surfing attack

  3. Rainbow and Hash generation attack

  4. Dumpster diving attack

Answer: A

Question No: 195 – (Topic 2)

E-mail tracking is a method to monitor and spy the delivered e-mails to the intended recipient.

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Select a feature, which you will NOT be able to accomplish with this probe?

  1. When the e-mail was received and read

  2. Send destructive e-mails

  3. GPS location and map of the recipient

  4. Time spent on reading the e-mails

  5. Whether or not the recipient visited any links sent to them

  6. Track PDF and other types of attachments

  7. Set messages to expire after specified time

  8. Remote control the User#39;s E-mail client application and hijack the traffic

Answer: H

Question No: 196 – (Topic 2)

Identify SQL injection attack from the HTTP requests shown below:

  1. http://www.myserver.c0m/search.asp? lname=smith’;update usertable set passwd=’hAx0r’;-

  2. http://www.myserver.c0m/script.php?mydata=

  3. http://www.victim.com/example accountnumber=67891amp;creditamount=999999999

Answer: A

Question No: 197 – (Topic 2)

Hampton is the senior security analyst for the city of Columbus in Ohio. His primary responsibility is to ensure that all physical and logical aspects of the city#39;s computer network are secure from all angles. Bill is an IT technician that works with Hampton in the same IT department. Bill#39;s primary responsibility is to keep PC#39;s and servers up to date and to keep track of all the agency laptops that the company owns and lends out to its employees. After Bill setup a wireless network for the agency, Hampton made sure that everything was secure. He instituted encryption, rotating keys, turned off SSID broadcasting, and enabled MAC filtering. According to agency policy, only company laptops are allowed to use the wireless network, so Hampton entered all the MAC addresses for those laptops into the wireless security utility so that only those laptops should be able to access the wireless network.

Hampton does not keep track of all the laptops, but he is pretty certain that the agency only purchases Dell laptops. Hampton is curious about this because he notices Bill working on a Toshiba laptop one day and saw that he was on the Internet. Instead of jumping to

conclusions, Hampton decides to talk to Bill#39;s boss and see if they had purchased a Toshiba laptop instead of the usual Dell. Bill#39;s boss said no, so now Hampton is very curious to see how Bill is accessing the Internet. Hampton does site surveys every couple of days, and has yet to see any outside wireless network signals inside the company#39;s building.

How was Bill able to get Internet access without using an agency laptop?

  1. Bill spoofed the MAC address of Dell laptop

  2. Bill connected to a Rogue access point

  3. Toshiba and Dell laptops share the same hardware address

  4. Bill brute forced the Mac address ACLs

Answer: A

Question No: 198 – (Topic 2)

What type of session hijacking attack is shown in the exhibit?

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  1. Session Sniffing Attack

  2. Cross-site scripting Attack

  3. SQL Injection Attack

  4. Token sniffing Attack

Answer: A

Question No: 199 – (Topic 2)

You establish a new Web browser connection to Google. Since a 3-way handshake is required for any TCP connection, the following actions will take place.

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->DNS query is sent to the DNS server to resolve www.google.com

->DNS server replies with the IP address for Google?

->SYN packet is sent to Google.

->Google sends back a SYN/ACK packet

->Your computer completes the handshake by sending an ACK

->The connection is established and the transfer of data commences

Which of the following packets represent completion of the 3-way handshake?

  1. 4th packet

  2. 3rdpacket

  3. 6th packet

  4. 5th packet

Answer: D

Question No: 200 – (Topic 2)

Michael is a junior security analyst working for the National Security Agency (NSA) working primarily on breaking terrorist encrypted messages. The NSA has a number of methods they use to decipher encrypted messages including Government Access to Keys (GAK) and inside informants. The NSA holds secret backdoor keys to many of the encryption algorithms used on the Internet. The problem for the NSA, and Michael, is that terrorist organizations are starting to use custom-built algorithms or obscure algorithms purchased from corrupt governments. For this reason, Michael and other security analysts like him have been forced to find different methods of deciphering terrorist messages. One method that Michael thought of using was to hide malicious code inside seemingly harmless programs. Michael first monitors sites and bulletin boards used by known terrorists, and then he is able to glean email addresses to some of these suspected terrorists. Michael then inserts a stealth keylogger into a mapping program file readme.txt and then sends that as an attachment to the terrorist. This keylogger takes screenshots every 2 minutes and also logs all keyboard activity into a hidden file on the terrorist#39;s computer. Then, the keylogger emails those files to Michael twice a day with a built in SMTP server. What technique has Michael used to disguise this keylogging software?

  1. Steganography

  2. Wrapping

  3. ADS

  4. Hidden Channels

Answer: C

Topic 3, Volume C

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