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NEW QUESTION 27
Which of the following statements relating to the Biba security model is FALSE?
- A. A subject is not allowed to write up.
- B. Programs serve as an intermediate layer between subjects and objects.
- C. Integrity levels are assigned to subjects and objects.
- D. It is a state machine model.
Answer: B
Explanation:
The Biba model was developed after the Bell-LaPadula model. It is a state machine model and is very similar to the Bell-LaPadula model but the rules are 100% the opposite of Bell-LaPadula.
Biba addresses the integrity of data within applications. The Bell-LaPadula model uses a lattice of security levels (top secret, secret, sensitive, and so on). These security levels were developed mainly to ensure that sensitive data was only available to authorized individuals. The Biba model
is not concerned with security levels and confidentiality, so it does not base access decisions upon
this type of lattice. The Biba model uses a lattice of integrity levels instead of a lattice of
confidentiality levels like Bel-LaPadula.
If implemented and enforced properly, the Biba model prevents data from any integrity level from
flowing to a higher integrity level. Biba has two main rules to provide this type of protection:
*-integrity axiom A subject cannot write data to an object at a higher integrity level (referred to as
"no write up").
Simple integrity axiom A subject cannot read data from a lower integrity level (referred to as "no
read down").
Extra Information on clark-wilson model to understand the concepts:
The Clark-Wilson model was developed after Biba and takes some different approaches to
protecting the integrity of information. This model uses the following elements:
Users Active agents
Transformation procedures (TPs) Programmed abstract operations, such as read, write, and
modify
Constrained data items (CDIs) Can be manipulated only by TPs
Unconstrained data items (UDIs) Can be manipulated by users via primitive read and write
operations
Integrity verification procedures (IVPs) Run periodically to check the consistency of CDIs with
external reality
The other answers are incorrect:
It is a state machine model: Biba model is a state machine model and addresses the integrity of
data within applications.
A subject is not allowed to write up is a part of integrity axiom in the Biba model.
Integrity levels are assigned to subjects and objects is also a characteristic of Biba model as it
addresses integrity.
Reference(s) used for this question:
Shon Harris , AIO v3 , Chapter-5 : Security Models and Architecture , Page : 282 - 284
Reference: AIOv4 Security Architecture and Design (pages 338 - 342)
AIOv5 Security Architecture and Design (pages 341 - 344)
NEW QUESTION 28
Under what conditions would the use of a Class C fire extinguisher be preferable to a Class A extinguisher?
- A. When the fire is caused by flammable products
- B. When the fire is in an enclosed area
- C. When the fire involves electrical equipment
- D. When the fire involves paper products
Answer: C
NEW QUESTION 29
In the UTP category rating, the tighter the wind:
- A. the higher the rating and its resistance against interference and crosstalk.
- B. the shorter the rating and its resistance against interference and attenuation.
- C. the longer the rating and its resistance against interference and attenuation.
- D. the slower the rating and its resistance against interference and attenuation.
Answer: A
Explanation:
The category rating is based on how tightly the copper cable is wound within the shielding: The tighter the wind, the higher the rating and its resistance against interference and crosstalk. Twisted pair copper cabling is a form of wiring in which two conductors are wound together for the purposes of canceling out electromagnetic interference (EMI) from external sources and crosstalk from neighboring wires. Twisting wires decreases interference because the loop area between the wires (which determines the magnetic coupling into the signal) is reduced. In balanced pair operation, the two wires typically carry equal and opposite signals (differential mode) which are combined by subtraction at the destination. The noise from the two wires cancel each other in this subtraction because the two wires have been exposed to similar EMI. The twist rate (usually defined in twists per metre) makes up part of the specification for a given type of cable. The greater the number of twists, the greater the attenuation of crosstalk. Where pairs are not twisted, as in most residential interior telephone wiring, one member of the pair may be closer to the source than the other, and thus exposed to slightly different induced EMF.
Reference:
KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 101.
and
http://www.consultants-online.co.za/pub/itap_101/html/ch04s05.html
NEW QUESTION 30
The only difference between RAID 3 and RAID 4 is that level 3 is implemented at the byte level while level 4 is usually implemented at which of the following?
- A. buffer level.
- B. bridge level.
- C. channel level.
- D. block level.
Answer: D
Explanation:
The only difference is that level 3 is implemented at the byte level and level 4 is usually implemented at the block level.
Reference(s) used for this question:
KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten
Domains of Computer Security, 2001, John Wiley & Sons, Page 66.
NEW QUESTION 31
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