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Download Certified Information Systems Security Professional Exam Dumps
NEW QUESTION 54
Which security model ensures that actions that take place at a higher security level do not affect actions that take place at a lower level?
- A. The information flow model
- B. The noninterference model
- C. The Bell-LaPadula model
- D. The Clark-Wilson model
Answer: B
Explanation:
The goal of a noninterference model is to strictly separate differing security levels to
assure that higher-level actions do not determine what lower-level users can see. This is in
contrast to other security models that control information flows between differing levels of users,
By maintaining strict separation of security levels, a noninterference model minimizes leakages
that might happen through a covert channel.
The model ensures that any actions that take place at a higher security level do not affect, or
interfere with, actions that take place at a lower level.
It is not concerned with the flow of data, but rather with what a subject knows about the state of
the system. So if an entity at a higher security level performs an action, it can not change the state
for the entity at the lower level.
The model also addresses the inference attack that occurs when some one has access to some
type of information and can infer(guess) something that he does not have the clearance level or
authority to know.
The following are incorrect answers:
The Bell-LaPadula model is incorrect. The Bell-LaPadula model is concerned only with
confidentiality and bases access control decisions on the classfication of objects and the
clearences of subjects.
The information flow model is incorrect. The information flow models have a similar framework to
the Bell-LaPadula model and control how information may flow between objects based on security
classes. Information will be allowed to flow only in accordance with the security policy.
The Clark-Wilson model is incorrect. The Clark-Wilson model is concerned with change control
and assuring that all modifications to objects preserve integrity by means of well-formed
transactions and usage of an access triple (subjet – interface – object).
References:
CBK, pp 325 – 326
AIO3, pp. 290 – 291
AIOv4 Security Architecture and Design (page 345)
AIOv5 Security Architecture and Design (pages 347 – 348)
https://en.wikibooks.org/wiki/Security_Architecture_and_Design/Security_Models#Noninterference
_Models
NEW QUESTION 55
Mandatory Access Controls (MAC) are based on:
- A. data segmentation and data classification
- B. user roles and data encryption
- C. data labels and user access permissions
- D. security classification and security clearance
Answer: D
Explanation:
Section: Security Architecture and Engineering
NEW QUESTION 56
Which of the following provides the comprehensive filtering of Peer-to-Peer (P2P) traffic?
- A. Network boundary router
- B. Application proxy
- C. Access layer switch
- D. Port filter
Answer: C
NEW QUESTION 57
A pen register is a:
- A. Device that identifies the cell in which a mobile phone is operating
- B. Device that records all the numbers dialed from a specific telephone line
- C. Device that records the caller-ID of incoming calls
- D. Device that records the URLs accessed by an individual
Answer: B
Explanation:
(Electronic Privacy Information Center, Approvals for Federal Pen Registers and Trap and Trace Devices 1987-1998, www.epic. org). Gathering information as to which numbers are dialed from a specific telephone line is less costly and time-consuming than installing a wiretap and recording the information.
*There is also equipment that can record the information listed in answers “Device that identifies the cell in which a mobile phone is operating” and “Device that records the URLs accessed by an individual”.
*The device referred to in answer “Device that records the caller-ID of incoming calls” is called a trap-and-trace device. All of the answers in this question are a subset of the category of traffic analysis wherein patterns and frequency associated with communications are studied instead of the content of the communications.
NEW QUESTION 58
Which item below is a federated identity standard?
- A. Security Assertion Markup Language (SAML)
- B. Kerberos
- C. Lightweight Directory Access Protocol (LDAP)
- D. 802.11i
Answer: A
NEW QUESTION 59
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