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NEW QUESTION: 1
Which of the following is a method to increase fault tolerance and reduce potential outages from network equipment failures downstream from the IBM i environment?
A. Enterprise Extender
B. Static Routing
C. Network Address Translation (NAT)
D. Virtual IP Addressing (VIPA)
Answer: D

NEW QUESTION: 2
This question will ask you to provide a segment of missing code.
Given the SAS data set WORK EXAM:
TotalScore
----------------
512
657
*
782
The following SAS program is submitted:

The following output is desired:
TotalScore
--------------
512
657
782
Which WHERE expression completes the program and generates the desired output?
A. Where TotalScore ne null
B. Where TotalScore ne missing
C. Where TotalScore is not
D. Where TotalScore is not missing
Answer: D

NEW QUESTION: 3
Which is the preferred approach to communicate important action items in an e-mail message to a co- worker?
A. Describe all action items at length in a detailed paragraph in the middle of the message.
B. Include emoticons to ensure the recipient understands your humor.
C. Write the action items using all capital letters.
D. List the action items in a numbered or bulleted list for clarity.
Answer: D

NEW QUESTION: 4
What can be defined as an abstract machine that mediates all access to objects by subjects to ensure that subjects have the necessary access rights and to protect objects from unauthorized access?
A. The Security Domain
B. The Trusted Computing Base
C. The Security Kernel
D. The Reference Monitor
Answer: D
Explanation:
The reference monitor refers to abstract machine that mediates all access to objects by subjects.
This question is asking for the concept that governs access by subjects to objects, thus the reference monitor is the best answer. While the security kernel is similar in nature, it is what actually enforces the concepts outlined in the reference monitor.
In operating systems architecture a reference monitor concept defines a set of design requirements on a reference validation mechanism, which enforces an access control policy over subjects' (e.g., processes and users) ability to perform operations (e.g., read and write) on objects (e.g., files and sockets) on a system. The properties of a reference monitor are:
The reference validation mechanism must always be invoked (complete mediation). Without this property, it is possible for an attacker to bypass the mechanism and violate the security policy.
The reference validation mechanism must be tamperproof (tamperproof). Without this property, an
attacker can undermine the mechanism itself so that the security policy is not correctly enforced.
The reference validation mechanism must be small enough to be subject to analysis and tests, the
completeness of which can be assured (verifiable). Without this property, the mechanism might be
flawed in such a way that the policy is not enforced.
For example, Windows 3.x and 9x operating systems were not built with a reference monitor,
whereas the Windows NT line, which also includes Windows 2000 and Windows XP, was
designed to contain a reference monitor, although it is not clear that its properties (tamperproof,
etc.) have ever been independently verified, or what level of computer security it was intended to
provide.
The claim is that a reference validation mechanism that satisfies the reference monitor concept will
correctly enforce a system's access control policy, as it must be invoked to mediate all security-
sensitive operations, must not be tampered, and has undergone complete analysis and testing to
verify correctness. The abstract model of a reference monitor has been widely applied to any type
of system that needs to enforce access control, and is considered to express the necessary and
sufficient properties for any system making this security claim.
According to Ross Anderson, the reference monitor concept was introduced by James Anderson
in an influential 1972 paper.
Systems evaluated at B3 and above by the Trusted Computer System Evaluation Criteria
(TCSEC) must enforce the reference monitor concept.
The reference monitor, as defined in AIO V5 (Harris) is: "an access control concept that refers to
an abstract machine that mediates all access to objects by subjects."
The security kernel, as defined in AIO V5 (Harris) is: "the hardware, firmware, and software
elements of a trusted computing based (TCB) that implement the reference monitor concept. The
kernel must mediate all access between subjects and objects, be protected from modification, and
be verifiable as correct."
The trusted computing based (TCB), as defined in AIO V5 (Harris) is: "all of the protection
mechanisms within a computer system (software, hardware, and firmware) that are responsible for
enforcing a security policy."
The security domain, "builds upon the definition of domain (a set of resources available to a
subject) by adding the fact that resources withing this logical structure (domain) are working under
the same security policy and managed by the same group."
The following answers are incorrect:
"The security kernel" is incorrect. One of the places a reference monitor could be implemented is
in the security kernel but this is not the best answer.
"The trusted computing base" is incorrect. The reference monitor is an important concept in the
TCB but this is not the best answer.
"The security domain is incorrect." The reference monitor is an important concept in the security
domain but this is not the best answer.
Reference(s) used for this question:
Official ISC2 Guide to the CBK, page 324
AIO Version 3, pp. 272 - 274
AIOv4 Security Architecture and Design (pages 327 - 328)
AIOv5 Security Architecture and Design (pages 330 - 331)
Wikipedia article at https://en.wikipedia.org/wiki/Reference_monitor