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EC-COUNCIL EC-Council Certified Network Defender CND Sample Questions (Q170-Q175):

NEW QUESTION # 170
Which of the following is a mechanism that helps in ensuring that only the intended and authorized recipients
are able to read data?

* A. Confidentiality
* B. Data availability
* C. Integrity
* D. Authentication
Answer: A

Explanation:
Confidentiality is a mechanism that ensures that only the intended and authorized recipients are able to read
data. The data is so encrypted that even if an unauthorized user gets access to it, he will not get any meaning
out of it.
Answer option A is incorrect. In information security, integrity means that data cannot be modified without
authorization. This is not the same thing as referential integrity in databases. Integrity is violated when an
employee accidentally or with malicious intent deletes important data files, when a computer virus infects a
computer, when an employee is able to modify his own salary in a payroll database, when an unauthorized
user vandalizes a web site, when someone is able to cast a very large number of votes in an online poll, and so
on. There are many ways in which integrity could be violated without malicious intent. In the simplest case, a
user on a system could mistype someone's address. On a larger scale, if an automated process is not written
and tested correctly, bulk updates to a database could alter data in an incorrect way, leaving the integrity of the
data compromised. Information security professionals are tasked with finding ways to implement controls that
prevent errors of integrity.
Answer option B is incorrect. Data availability is one of the security principles that ensures that the data and
communication services will be available for use when needed (expected). It is a method of describing
products and services availability by which it is ensured that data continues to be available at a required level of
performance in situations ranging from normal to disastrous. Data availability is achieved through redundancy,
which depends upon where the data is stored and how it can be reached.
Answer option D is incorrect. Authentication is the act of establishing or confirming something (or someone) as
authentic, i.e., the claims made by or about the subject are true ("authentification" is a variant of this word).

NEW QUESTION # 171
Which of the following flag to set whether the scan sends TCP Christmas tree frame with the remote machine? Each correct answer represents a part of the solution. Choose all that apply.

* A. PUSH
* B. RST
* C. FIN
* D. URG
Answer: A,C,D

NEW QUESTION # 172
Which of the following is the primary international body for fostering cooperative standards for telecommunications equipment and systems?

* A. IEEE
* B. ICANN
* C. CCITT
* D. NIST
Answer: C

Explanation:
CCITT is the primary international body for fostering cooperative standards for telecommunications equipment and systems. It is now known as the ITU-T (for Telecommunication Standardization Sector of the International Telecommunications Union). The ITU-T mission is to ensure the efficient and timely production of standards covering all fields of telecommunications on a worldwide basis, as well as defining tariff and accounting principles for international telecommunication services. Answer option A is incorrect. Internet Corporation for Assigned Names and Numbers (ICANN) is a non-profit organization that oversees the allocation of IP addresses, management of the DNS infrastructure, protocol parameter assignment, and root server system management. Answer option B is incorrect. The Institute of Electrical and Electronic Engineers (IEEE) is a society of technical professionals. It promotes the development and application of electrotechnology and allied sciences. IEEE develops communications and network standards, among other activities. The organization publishes number of journals, has many local chapters, and societies in specialized areas. Answer option C is incorrect. The National Institute of Standards and Technology (NIST), known between 1901 and 1988 as the National Bureau of Standards (NBS), is a measurement standards laboratory which is a non-regulatory agency of the United States Department of Commerce. The institute's official mission is as follows: To promote U.S. innovation and industrial competitiveness by advancing measurement science, standards, and technology in ways that enhance economic security and improve quality of life. NIST had an operating budget for fiscal year 2007 (October 1, 2006-September 30, 2007) of about $843.3 million. NIST's 2009 budget was $992 million, but it also received $610 million as part of the American Recovery and Reinvestment Act. NIST employs about 2,900 scientists, engineers, technicians, and support and administrative personnel. About 1,800 NIST associates (guest researchers and engineers from American companies and foreign nations) complement the staff. In addition, NIST partners with 1,400 manufacturing specialists and staff at nearly 350 affiliated centers around the country.

NEW QUESTION # 173
You are advising a school district on disaster recovery plans. In case a disaster affects the main IT centers for the district they will need to be able to work from an alternate location. However, budget is an issue. Which of the following is most appropriate for this client?

* A. Warm site
* B. Cold site
* C. Hot site
* D. Off site
Answer: B

NEW QUESTION # 174
In which of the following attacks does an attacker successfully insert an intermediary software or program between two communicating hosts?

* A. Session hijacking
* B. Buffer overflow
* C. Denial-of-Service
* D. Man-in-the-middle
Answer: D

Explanation:
Man-in-the-middle attacks occur when an attacker successfully inserts an intermediary software or program between two communicating hosts. The intermediary software or program allows attackers to listen to and modify the communication packets passing between the two hosts. The software intercepts the communication packets and then sends the information to the receiving host. The receiving host responds to the software, presuming it to be the legitimate client. Answer option B is incorrect. A Denial-of-Service (DoS) attack is mounted with the objective of causing a negative impact on the performance of a computer or network. It is also known as a network saturation attack or bandwidth consumption attack. Attackers perform DoS attacks by sending a large number of protocol packets to the network. The effects of a DoS attack are as follows: Saturates network resources Disrupts connections between two computers, thereby preventing communications between services Disrupts services to a specific computer Causes failure to access a Web site Results in an increase in the amount of spam A Denial-of-Service attack is very common on the Internet because it is much easier to accomplish. Most of the DoS attacks rely on the weaknesses in the TCP/IP protocol. Answer option D is incorrect. A buffer-overflow attack is performed when a hacker fills a field, typically an address bar, with more characters than it can accommodate. The excess characters can be run as executable code, effectively giving the hacker control of the computer and overriding any security measures set. There are two main types of buffer overflow attacks: stack-based buffer overflow attack: Stack-based buffer overflow attack uses a memory object known as a stack. The hacker develops the code which reserves a specific amount of space for the stack. If the input of user is longer than the amount of space reserved for it within the stack, then the stack will overflow. heap-based buffer overflow attack: Heap-based overflow attack floods the memory space reserved for the programs. Answer option A is incorrect. Session hijacking refers to the exploitation of a valid computer session to gain unauthorized access to information or services in a computer system. In particular, it is used to refer to the theft of a magic cookie used to authenticate a user to a remote server. It has particular relevance to Web developers, as the HTTP cookies used to maintain a session on many Web sites can be easily stolen by an attacker using an intermediary computer or with access to the saved cookies on the victim's computer (see HTTP cookie theft). TCP session hijacking is when a hacker takes over a TCP session between two machines. Since most authentication only occurs at the start of a TCP session, this allows the hacker to gain access to a machine.

NEW QUESTION # 175
......

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