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NEW QUESTION: 1
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 Reference Monitor
C. The Trusted Computing Base
D. The Security Kernel
Answer: B
Explanation:
Explanation/Reference:
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

NEW QUESTION: 2
管理者は、VLAN 50をスイッチに追加できませんでした。問題のトラブルシューティング中に、管理者は、図に表示されているshow vtp statusコマンドの出力を表示します。 VLAN 50をデータベースに追加するには、このスイッチでどのコマンドを発行する必要がありますか？
（2つ選択してください。）

A. Switch(vlan)# vtp server
B. Switch(config)# vlan 50 name Tech
C. Switch(vlan)# switchport trunk vlan 50
D. Switch(config)# config-revision 20
E. Switch(config-if)# switchport access vlan 50
F. Switch(vlan)# vlan 50
Answer: A,F

NEW QUESTION: 3
Which three functions does the Master Agent perform? (Choose three.)
A. stores DRS configuration
B. executes backup and restore tasks
C. communicates with archive devices
D. controls backup and restoration of the system
E. acts as a backup repository
F. interfaces with the DRS agent on the Administrator PC
Answer: A,C,D
Explanation:
Duties That the Master Agent Performs
The Master Agent (MA) performs the following duties:
The MA stores systemwide component registration information.
The MA maintains a complete set of scheduled tasks in the database. When it receives updates
from the user interface, the MA sends executable tasks to the applicable Local Agents, as
scheduled. (Local Agents execute immediate-backup tasks without delay.)
You access the MA through the Disaster Recovery System user interface to perform activities
such as configuring backup devices, scheduling backups by adding new backup schedules,
viewing or updating an existing schedule, displaying status of executed schedules, and performing
system restoration.
The MA stores backup data on a locally attached tape drive or a remote network location.
Duties That Local Agents Perform
The Local Agent runs backup and restores scripts on the server.
In a cluster, the Local Agent runs backup and restores scripts on each node in the cluster.