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NEW QUESTION: 1
다음 중 BCP (Business Continuity Plan) 테스트에 가장 적합한 방법은 무엇입니까?
A. 환경 변화시 테스트
B. 보안 패치 설치 후 테스트
C. 시스템 패치 구현 후 테스트
D. IT 감사 전 테스트
Answer: A

NEW QUESTION: 2
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 Kernel
B. The Security Domain
C. The Reference Monitor
D. The Trusted Computing Base
Answer: C
Explanation:
Explanation/Reference:
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 within this logical structure (domain) are working under the same security policy and managed by the same group."
Incorrect Answers:
B: "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.
C: "The trusted computing base" is incorrect. The reference monitor is an important concept in the TCB but this is not the best answer.
D: "The security domain is incorrect." The reference monitor is an important concept in the security domain but this is not the best answer.
References: 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)
https://en.wikipedia.org/wiki/Reference_monitor

NEW QUESTION: 3
사용량이 많지 않은 시간에 개발자는 일반 작업 부하에 영향을 주지 않으면 서 전체 Amazon DynamoDB 테이블 검색의 실행 시간을 최소화하려고 합니다. 작업량은 비 피크 시간 동안 강하게 일관성 있는 읽기 용량 단위의 평균을 나타냅니다.
개발자가이 스캔을 어떻게 최적화합니까?
A. 비율을 제한하면서 병렬 스캔 사용
B. 스캔 작업 중 읽기 용량 단위 늘리기
C. 순차적 스캔 사용
D. 스캔 작업 중에 일관성을 유지하도록 일관성을 변경합니다.
Answer: A
Explanation:
설명
병렬 스캔은 스캔 성능을 향상시키는 데 도움이되며 제한 매개 변수를 사용하면 제공된 처리량이 제한 될 수 있습니다.
AWS 설명서 참조 - DynamoDB 병렬 스캔
기본적으로 스캔 작업은 데이터를 순차적으로 처리합니다. DynamoDB는 데이터를 1MB 단위로 응용 프로그램에 반환하고 응용 프로그램은 다음 1MB의 데이터를 검색하기 위해 추가 작업을 수행합니다.
스캔 할 테이블이나 인덱스가 클수록 테이크 시간이 길어집니다. 또한 순차적 검색은 준비된 읽기 처리량을 항상 충분히 활용하지 못할 수 있습니다. DynamoDB가 여러 물리적 파티션에 큰 테이블의 데이터를 배포하더라도 스캔 작업은 한 번에 하나의 파티션 만 읽을 수 있습니다. 이러한 이유 때문에 a의 처리량은 단일 파티션의 최대 처리량으로 인해 제한됩니다.
이러한 문제를 해결하기 위해 스캔 작업은 표 또는 보조 색인을 논리적으로 여러 세그먼트로 나눌 수 있으며 여러 응용 프로그램 작업자가 세그먼트를 병렬로 검색합니다. 각 작업자는 스레드 (멀티 스레딩을 지원하는 프로그래밍 언어에서) 또는 운영 체제 프로세스가 될 수 있습니다.
다수의 작업자가 있는 병렬 스캔은 스캔중인 테이블 또는 인덱스에 대해 프로비저닝 된 모든 처리량을 쉽게 소비 할 수 있습니다. 테이블 또는 색인이 다른 응용 프로그램에서 많은 읽기 또는 쓰기 활동을 초래할 경우 이러한 스캔을 피하는 것이 가장 좋습니다.
요청 당 반환되는 데이터의 양을 제어하려면 Limit 매개 변수를 사용하십시오. 이렇게하면 한 명의 작업자가 다른 모든 작업자를 희생시키면서 모든 처리량을 소비하는 상황을 방지 할 수 있습니다.

NEW QUESTION: 4
Which option can an administrator use to reduce the size of catalogs when the catalog folder is too large?
A. Agedatabase
B. Deleteafter X days
C. BEDatabase maintenance
D. Truncateafter X days
Answer: D