SSCP Fragen Antworten - SSCP Lernressourcen

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ISC System Security Certified Practitioner (SSCP) SSCP Prüfungsfragen mit Lösungen (Q357-Q362):

357. Frage
A Business Continuity Plan should be tested:

A. At least once a year.
B. At least twice a year.
C. Once a month.
D. At least once every two years.

Antwort: A

Begründung:
Section: Risk, Response and Recovery
Explanation/Reference:
It is recommended that testing does not exceed established frequency limits. For a plan to be effective, all components of the BCP should be tested at least once a year. Also, if there is a major change in the operations of the organization, the plan should be revised and tested not more than three months after the change becomes operational.
Source: BARNES, James C. & ROTHSTEIN, Philip J., A Guide to Business Continuity Planning, John Wiley & Sons, 2001 (page 165).

358. Frage
Which of the following is NOT true concerning Application Control?

A. It is non-transparent to the endpoint applications so changes are needed to the applications and databases involved
B. Only specific records can be requested through the application controls
C. It limits end users use of applications in such a way that only particular screens are visible.
D. Particular usage of the application can be recorded for audit purposes

Antwort: A

Begründung:
Section: Security Operation Adimnistration
Explanation/Reference:
Source: TIPTON, Harold F. & KRAUSE, MICKI, Information Security Management Handbook, 4th Edition, Volume 2, Auerbach.

359. Frage
Which of the following protects a password from eavesdroppers and supports the encryption of communication?

A. Challenge Handshake Identification Protocol (CHIP)
B. Challenge Handshake Substitution Protocol (CHSP)
C. Challenge Handshake Authentication Protocol (CHAP)
D. Challenge Handshake Encryption Protocol (CHEP)

Antwort: C

Begründung:
Explanation/Reference:
CHAP: A protocol that uses a three way hanbdshake The server sends the client a challenge which includes a random value(a nonce) to thwart replay attacks. The client responds with the MD5 hash of the nonce and the password.
The authentication is successful if the client's response is the one that the server expected.
Reference: Page 450, OIG 2007.
CHAP protects the password from eavesdroppers and supports the encryption of communication.
Reference: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 44.

360. Frage
Which xDSL flavour can deliver up to 52 Mbps downstream over a single copper twisted pair?

A. HDSL
B. VDSL
C. ADSL
D. SDSL

Antwort: B

Begründung:
Very-high data-rate Digital Subscriber Line (VDSL) can deliver up to 52 Mbps downstream over a single copper twisted pair over a relatively short distance (1000 to 4500 feet). DSL (Digital Subscriber Line) is a modem technology for broadband data access over ordinary copper telephone lines (POTS) from homes and businesses. xDSL refers collectively to all types of DSL, such as ADSL (and G.Lite), HDSL, SDSL, IDSL and VDSL etc. They are sometimes referred to as last-mile (or first mile) technologies because they are used only for connections from a telephone switching station to a home or office, not between switching stations.
xDSL is similar to ISDN in as much as both operate over existing copper telephone lines (POTS) using sophisticated modulation schemes and both require the short runs to a central telephone office
Graphic below from: http://computer.howstuffworks.com/vdsl3.htm

DSL speed chart
The following are incorrect answers:
Single-line Digital Subscriber Line (SDSL) deliver 2.3 Mbps of bandwidth each way. High-rate Digital Subscriber Line (HDSL) deliver 1.544 Mbps of bandwidth each way. ADSL delivers a maximum of 8 Mbps downstream for a total combined speed of almost 9 Mbps up and down.
Reference used for this question:
http://computer.howstuffworks.com/vdsl3.htm and http://www.javvin.com/protocolxDSL.html and KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 3: Telecommunications and Network Security (page 115).

361. Frage
Which access control model would a lattice-based access control model be an example of?

A. Mandatory access control.
B. Rule-based access control.
C. Discretionary access control.
D. Non-discretionary access control.

Antwort: A

Begründung:
Section: Access Control
Explanation/Reference:
In a lattice model, there are pairs of elements that have the least upper bound of values and greatest lower bound of values. In a Mandatory Access Control (MAC) model, users and data owners do not have as much freedom to determine who can access files.
TIPS FROM CLEMENT
Mandatory Access Control is in place whenever you have permissions that are being imposed on the subject and the subject cannot arbitrarily change them. When the subject/owner of the file can change permissions at will, it is discretionary access control.
Here is a breakdown largely based on explanations provided by Doug Landoll. I am reproducing below using my own word and not exactly how Doug explained it:
FIRST: The Lattice
A lattice is simply an access control tool usually used to implement Mandatory Access Control (MAC) and it could also be used to implement RBAC but this is not as common. The lattice model can be used for Integrity level or file permissions as well. The lattice has a least upper bound and greatest lower bound. It makes use of pair of elements such as the subject security clearance pairing with the object sensitivity label.
SECOND: DAC (Discretionary Access Control)
Let's get into Discretionary Access Control: It is an access control method where the owner (read the creator of the object) will decide who has access at his own discretion. As we all know, users are sometimes insane.
They will share their files with other users based on their identity but nothing prevent the user from further sharing it with other users on the network. Very quickly you loose control on the flow of information and who has access to what. It is used in small and friendly environment where a low level of security is all that is required.
THIRD: MAC (Mandatory Access Control)
All of the following are forms of Mandatory Access Control:
Mandatory Access control (MAC) (Implemented using the lattice)
You must remember that MAC makes use of Security Clearance for the subject and also Labels will be assigned to the objects. The clearance of the Subject must dominate (be equal or higher) the clearance of the Object being accessed. The label attached to the object will indicate the sensitivity leval and the categories the object belongs to. The categories are used to implement the Need to Know.
All of the following are forms of Non Discretionary Access Control:
Role Based Access Control (RBAC)
Rule Based Access Control (Think Firewall in this case)
The official ISC2 book says that RBAC (synonymous with Non Discretionary Access Control) is a form of DAC but they are simply wrong. RBAC is a form of Non Discretionary Access Control. Non Discretionary DOES NOT equal mandatory access control as there is no labels and clearance involved.
I hope this clarifies the whole drama related to what is what in the world of access control.
In the same line of taught, you should be familiar with the difference between Explicit permission (the user has his own profile) versus Implicit (the user inherit permissions by being a member of a role for example).
The following answers are incorrect:
Discretionary access control. Is incorrect because in a Discretionary Access Control (DAC) model, access is restricted based on the authorization granted to the users. It is identity based access control only. It does not make use of a lattice.
Non-discretionary access control. Is incorrect because Non-discretionary Access Control (NDAC) uses the role-based access control method to determine access rights and permissions. It is often times used as a synonym to RBAC which is Role Based Access Control. The user inherit permission from the role when they are assigned into the role. This type of access could make use of a lattice but could also be implemented without the use of a lattice in some case. Mandatory Access Control was a better choice than this one, but RBAC could also make use of a lattice. The BEST answer was MAC.
Rule-based access control. Is incorrect because it is an example of a Non-discretionary Access Control (NDAC) access control mode. You have rules that are globally applied to all users. There is no such thing as a lattice being use in Rule-Based Access Control.
References:
AIOv3 Access Control (pages 161 - 168)
AIOv3 Security Models and Architecture (pages 291 - 293)

362. Frage
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