Which of the following is the most reliable, secure means of removing data from magnetic storage media such as a magnetic tape, or a cassette? A. Degaussing B. Parity Bit Manipulation C. Zeroization D. Buffer overflow
Correct Answer: A
Explanation:
A “Degausser (Otherwise known as a Bulk Eraser) has the main function of reducing to near zero the magnetic flux stored in the magnetized medium. Flux density is measured in Gauss or Tesla. The operation is speedier than overwriting and done in one short operation. This is achieved by subjecting the subject in bulk to a series of fields of alternating polarity and gradually decreasing strength.
The following answers are incorrect:Parity Bit Manipulation. Parity has to do with disk lerror detection, not data removal. A bit or series of bits appended to a character or block of characters to ensure that the information received is the same as the infromation that was sent.
Zeroization. Zeroization involves overwrting data to sanitize it. It is time-consuming and not foolproof. The potential of restoration of data does exist with this method. Buffer overflow. This is a detractor. Although many Operating Systems use a disk buffer to temporarily hold data read from disk, its primary purpose has no connection to data removal. An overflow goes outside the constraints defined for the buffer and is a method used by an attacker to attempt access to a system.
The following reference(s) were/was used to create this question:
Shon Harris AIO v3. pg 908 Reference: What is degaussing.
Which of the following is the most reliable authentication method for remote access? A. Variable callback system B. Synchronous token C. Fixed callback system D. Combination of callback and caller ID
Correct Answer: B
Explanation:
A Synchronous token generates a one-time password that is only valid for a short period of time. Once the password is used it is no longer valid, and it expires if not entered in the acceptable time frame.
The following answers are incorrect: Variable callback system. Although variable callback systems are more flexible than fixed callback systems, the system assumes the identity of the individual unless two-factor authentication is also implemented. By itself, this method might allow an attacker access as a trusted user.
Fixed callback system. Authentication provides assurance that someone or something is who or what he/it is supposed to be. Callback systems authenticate a person, but anyone can pretend to be that person. They are tied to a specific place and phone number, which can be spoofed by implementing call-forwarding.
Combination of callback and Caller ID. The caller ID and callback functionality provides greater confidence and auditability of the caller’s identity. By disconnecting and calling back only authorized phone numbers, the system has a greater confidence in the location of the call. However, unless combined with strong authentication, any individual at the location could obtain access.
The following reference(s) were/was used to create this question:
Shon Harris AIO v3 p. 140, 548 ISC2 OIG 2007 p. 152-153, 126-127
The end result of implementing the principle of least privilege means which of the following? A. Users would get access to only the info for which they have a need to know B. Users can access all systems. C. Users get new privileges added when they change positions. D. Authorization creep.
Correct Answer: A
Explanation:
The principle of least privilege refers to allowing users to have only the access they need and not anything more. Thus, certain users may have no need to access any of the files on specific systems.
The following answers are incorrect: Users can access all systems. Although the principle of least privilege limits what access and systems users have authorization to, not all users would have a need to know to access all of the systems. The best answer is still Users would get access to only the info for which they have a need to know as some of the users may not have a need to access a system.
Users get new privileges when they change positions. Although true that a user may indeed require new privileges, this is not a given fact and in actuality a user may require less privileges for a new position. The principle of least privilege would require that the rights required for the position be closely evaluated and where possible rights revoked.
Authorization creep. Authorization creep occurs when users are given additional rights with new positions and responsibilities. The principle of least privilege should actually prevent authorization creep.
The following reference(s) were/was used to create this question:
ISC2 OIG 2007 p.101,123 Shon Harris AIO v3 p148, 902-903
The Computer Security Policy Model the Orange Book is based on is which of the following? A. Bell-LaPadula B. Data Encryption Standard C. Kerberos D. Tempest
Correct Answer: A
Explanation:
The Computer Security Policy Model Orange Book is based is the Bell-LaPadula Model. Orange Book Glossary. The Data Encryption Standard (DES) is a cryptographic algorithm. National Information Security Glossary. TEMPEST is related to limiting the electromagnetic emanations from electronic equipment. Reference: U.S. Department of Defense, Trusted Computer System Evaluation Criteria (Orange Book), DOD 5200.28-STD. December 1985 (also available here).
Which is the last line of defense in a physical security sense? A. people B. interior barriers C. exterior barriers D. perimeter barriers
Correct Answer: A
Explanation:
“Ultimately, people are the last line of defense for your company’s assets” (Pastore & Dulaney, 2006, p. 529). Pastore, M. and Dulaney, E. (2006). CompTIA Security+ study guide: Exam SY0-101. Indianapolis, IN: Sybex.
What physical characteristic does a retinal scan biometric device measure? A. The amount of light reaching the retina B. The amount of light reflected by the retina C. The pattern of light receptors at the back of the eye D. The pattern of blood vessels at the back of the eye
Correct Answer: D
Explanation:
The retina, a thin nerve (1/50th of an inch) on the back of the eye, is the part of the eye which senses light and transmits impulses through the optic nerve to the brain -the equivalent of film in a camera. Blood vessels used for biometric identification are located along the neural retina, the outermost of retina’s four cell layers.
The following answers are incorrect:
The amount of light reaching the retina The amount of light reaching the retina is not used in the biometric scan of the retina. The amount of light reflected by the retina The amount of light reflected by the retina is not used in the biometric scan of the retina.
The pattern of light receptors at the back of the eye This is a distractor
The following reference(s) were/was used to create this question:
Reference: Retina Scan Technology. ISC2 Official Guide to the CBK, 2007 (Page 161)
Guards are appropriate whenever the function required by the security program involves which of the following? A. The use of discriminating judgment B. The use of physical force C. The operation of access control devices D. The need to detect unauthorized access
Correct Answer: A
Explanation:
The Answer: The use of discriminating judgment, a guard can make the determinations that hardware or other automated security devices cannot make due to its ability to adjust to rapidly changing conditions, to learn and alter recognizable patterns, and to respond to various conditions in the environment. Guards are better at making value decisions at times of incidents. They are appropriate whenever immediate, discriminating judgment is required by the security entity.
The following answers are incorrect:
The use of physical force This is not the best answer. A guard provides discriminating judgment, and the ability to discern the need for physical force. The operation of access control devices A guard is often uninvolved in the operations of an automated access control device such as a biometric reader, a smart lock, mantrap, etc. The need to detect unauthorized access The primary function of a guard is not to detect unauthorized access, but to prevent unauthorized physical access attempts and may deter social engineering attempts.
The following reference(s) were/was used to create this question: Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 10: Physical security (page 339).
Source: ISC2 Offical Guide to the CBK page 288-289.
Examples of types of physical access controls include all EXCEPT which of the following? A. badges B. locks C. guards D. passwords
Correct Answer: D
Explanation:
Passwords are considered a Preventive/Technical (logical) control.
The following answers are incorrect:
badges Badges are a physical control used to identify an individual. A badge can include a smart device which can be used for authentication and thus a Technical control, but the actual badge itself is primarily a physical control.
locks Locks are a Preventative Physical control and has no Technical association. guards Guards are a Preventative Physical control and has no Technical association.
The following reference(s) were/was used to create this question:
Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 2: Access control systems (page 35).
The number of violations that will be accepted or forgiven before a violation record is produced is called which of the following? A. clipping level B. acceptance level C. forgiveness level D. logging level
Correct Answer: A
Explanation:
The correct answer is “clipping level”. This is the point at which a system decides to take some sort of action when an action repeats a preset number of times. That action may be to log the activity, lock a user account, temporarily close a port, etc.
Example: The most classic example of a clipping level is failed login attempts. If you have a system configured to lock a user’s account after three failed login attemts, that is the “clipping level”.
The other answers are not correct because:
Acceptance level, forgiveness level, and logging level are nonsensical terms that do not exist (to my knowledge) within network security.
Reference:
Official ISC2 Guide -The term “clipping level” is not in the glossary or index of that book. I cannot find it in the text either. However, I’m quite certain that it would be considered part of the CBK, despite its exclusion from the Official Guide. All in One Third Edition page: 136 -137
Examples of types of physical access controls include all EXCEPT which of the following? A. badges B. locks C. guards D. passwords
Correct Answer: D
Explanation:
Passwords are considered a Preventive/Technical (logical) control.
The following answers are incorrect:
badges Badges are a physical control used to identify an individual. A badge can include a smart device which can be used for authentication and thus a Technical control, but the actual badge itself is primarily a physical control.
locks Locks are a Preventative Physical control and has no Technical association. guards Guards are a Preventative Physical control and has no Technical association. The following reference(s) were/was used to create this question: Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security,
John Wiley & Sons, 2001, Chapter 2: Access control systems (page 35).
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