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NEW QUESTION: 1
In the past few years, the import of cars to Italy increased significantly. In the years 1994 to 2001 the number of imported cars increased by 12% each year. How many cars were imported to Italy in the year
2000?
(1) In 1997, 12,500 cars were imported to Italy.
(2) During the years 1997 to 1999, 42,180 cars total were shipped to Italy.
A. Either statement BY ITSELF is sufficient to answer the question.
B. Statements (1) and (2) TAKEN TOGETHER are sufficient to answer the question, even though NEITHER statement BY ITSELF is sufficient.
C. Statements (1) and (2) TAKEN TOGETHER are NOT sufficient to answer the question, requiring more data pertaining to the problem.
D. Statement (2) BY ITSELF is sufficient to answer the question, but statement (1) by itself is not.
E. Statement (1) BY ITSELF is sufficient to answer the question, but statement (2) by itself is not.
Answer: A
Explanation:
Explanation/Reference:
Explanation:
From the question we know that the number of cars grew by 12% each year.
From (1) we can learn that if in 1997 12,500 cars were shipped then in 1998 (1.12 x 12.500) cars were shipped and so on until 2000. This statement is sufficient.
From (2) we can learn that during a certain period 42,180 cars were shipped, if you define X as the number of cars that were shipped in 1997 then: 42,180 = X + 1.2X + 1.2(1.2X) and so we can find X and anything else we wish to find. Either statement alone is sufficient.
NEW QUESTION: 2
Which of the following method is recommended by security professional to
PERMANENTLY erase sensitive data on magnetic media?
A. Format magnetic media
B. Delete File allocation table
C. Overwrite every sector of magnetic media with pattern of 1's and 0's
D. Degaussing
Answer: D
Explanation:
PERMANENTLY is the keyword used in the question. You need to find out data removal method which remove data permanently from magnetic media.
Degaussing is the most effective method out of all provided choices to erase sensitive data on magnetic media provided magnetic media is not require to be reuse. Some degaussers can destroy drives. The security professional should exercise caution when recommending or using degaussers on media for reuse.
A device that performs degaussing generates a coercive magnetic force that reduces the magnetic flux density of the storage media to zero. This magnetic force is what properly erases data from media. Data are stored on magnetic media by the representation of the polarization of the atoms. Degaussing changes this polarization (magnetic alignment) by using a type of large magnet to bring it back to its original flux (magnetic alignment).
For your exam you should know the information below:
When media is to be reassigned (a form of object reuse), it is important that all residual data is carefully removed.
Simply deleting files or formatting the media does not actually remove the information. File deletion and media formatting often simply remove the pointers to the information.
Providing assurance for object reuse requires specialized tools and techniques according to the type of media on which the data resides.
Specialized hardware devices known as degaussers can be used to erase data saved to magnetic media. The measure of the amount of energy needed to reduce the magnetic field on the media to zero is known as coercivity. It is important to make sure that the coercivity of the degausser is of sufficient strength to meet object reuse requirements when erasing data. If a degausser is used with insufficient coercivity, then a remanence of the data will exist.
Remanence is the measure of the existing magnetic field on the media; it is the residue that remains after an object is degaussed or written over. Data is still recoverable even when the remanence is small. While data remanence exists, there is no assurance of safe object reuse. Some degaussers can destroy drives. The security professional should exercise caution when recommending or using degaussers on media for reuse.
Software tools also exist that can provide object reuse assurance. These tools overwrite every sector of magnetic media with a random or predetermined bit pattern. Overwrite methods are effective for all forms of electronic media with the exception of read-only optical media. There is a drawback to using overwrite software. During normal write operations with magnetic media, the head of the drive moves back-and-forth across the media as data is written. The track of the head does not usually follow the exact path each time. The result is a miniscule amount of data remanence with each pass. With specialized equipment, it is possible to read data that has been overwritten.
To provide higher assurance in this case, it is necessary to overwrite each sector multiple times. Security practitioners should keep in mind that a one-time pass may be acceptable for noncritical information, but sensitive data should be overwritten with multiple passes.
Overwrite software can also be used to clear the sectors within solid-state media such as
USB thumb drives. It is suggested that physical destruction methods such as incineration or secure recycling should be considered for solid-state media that is no longer used.
The last form of preventing unauthorized access to sensitive data is media destruction.
Shredding, burning, grinding, and pulverizing are common methods of physically destroying media. Degaussing can also be a form of media destruction. High-power degaussers are so strong in some cases that they can literally bend and warp the platters in a hard drive.
Shredding and burning are effective destruction methods for non-rigid magnetic media.
Indeed, some shredders are capable of shredding some rigid media such as an optical disk. This may be an effective alternative for any optical media containing nonsensitive information due to the residue size remaining after feeding the disk into the machine.
However, the residue size might be too large for media containing sensitive information.
Alternatively, grinding and pulverizing are acceptable choices for rigid and solid-state media. Specialized devices are available for grinding the face of optical media that either sufficiently scratches the surface to render the media unreadable or actually grinds off the data layer of the disk. Several services also exist which will collect drives, destroy them on site if requested and provide certification of completion. It will be the responsibility of the security professional to help, select, and maintain the most appropriate solutions for media cleansing and disposal.
The following answers are incorrect:
Overwrite every sector of magnetic media with pattern of 1's and 0's- Less effective than degaussing provided magnetic media is not require to be reuse.
Format magnetic media - Formatting magnetic media does not erase all data. Data can be recoverable after formatting using software tools.
Delete File allocation table - It will not erase all data. Data can be recoverable using software tools.
The following reference(s) were/was used to create this question:
CISA review manual 2014 Page number 338
Official ISC2 guide to CISSP CBK 3rd Edition Page number 720
NEW QUESTION: 3
한 대학의 보안 관리자가 Amazon EC2 인스턴스를 구성하고 있습니다. EC2 인스턴스는 학생간에 공유되며 루트가 아닌 SSH 액세스가 허용됩니다. 관리자는 EC2 인스턴스 메타 데이터 서비스를 사용하여 다른 AWS 계정 리소스를 공격하는 학생에 대해 우려합니다.
이 잠재적 공격으로부터 관리자를 보호하기 위해 무엇을 할 수 있습니까?
A. EC2 인스턴스 메타 데이터 서비스를 비활성화합니다.
B. 인스턴스에 ip 테이블 기반 제한을 구현하십시오.
C. 모든 학생 SSH 대화식 세션 활동을 기록합니다.
D. 인스턴스에 Amazon Inspector 에이전트를 설치합니다.
Answer: A
Explanation:
"To turn off access to instance metadata on an existing instance....." https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configuring-instance-metadata-service.html You can disable the service for existing (running or stopped) ec2 instances. https://docs.aws.amazon.com/cli/latest/reference/ec2/modify-instance-metadata-options.html