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NEW QUESTION: 1
Refer to the exhibit
A connection is being established to IP 1.1.1.1 on port 8080.
Which virtual server will handle the connection?
A. fwd_8080_vs
B. host_ 8080_VS
C. fwdvs
D. host_vs
Answer: D
NEW QUESTION: 2
A. Option B
B. Option D
C. Option A
D. Option C
Answer: B
NEW QUESTION: 3
Which access control model would a lattice-based access control model be an example of?
A. Rule-based access control.
B. Discretionary access control.
C. Mandatory access control.
D. Non-discretionary access control.
Answer: C
Explanation:
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.
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)
NEW QUESTION: 4
What is a video conferencing endpoint?
A. H.323 Video devices
B. Scopia Elite MCUs that people use to make video connections
C. Point-to-point video calls
D. physical equipment or software that people use to make video connections
Answer: D