The most commonly used fence is the chain linked fence and it is the most
affordable. The standard is a six-foot high fence with two-inch mesh square openings. The
material should consist of nine-gauge vinyl or galvanized metal. Nine-gauge is a typical
fence material installed in residential areas.
Additionally, it is recommended to place barbed wire strands angled out from the top of the
fence at a 45 angle and away from the protected area with three strands running across
the top. This will provide for a seven-foot fence. There are several variations of the use of
"top guards" using V-shaped barbed wire or the use of concertina wire as an enhancement,
which has been a replacement for more traditional three strand barbed wire "top guards."
The fence should be fastened to ridged metal posts set in concrete every six feet with
additional bracing at the corners and gate openings. The bottom of the fence should be
stabilized against intruders crawling under by attaching posts along the bottom to keep the
fence from being pushed or pulled up from the bottom. If the soil is sandy, the bottom edge
of the fence should be installed below ground level.
For maximum security design, the use of double fencing with rolls of concertina wire
positioned between the two fences is the most effective deterrent and cost-efficient
method. In this design, an intruder is required to use an extensive array of ladders and
equipment to breach the fences.
Most fencing is largely a psychological deterrent and a boundary marker rather than a
barrier, because in most cases such fences can be rather easily penetrated unless added
security measures are taken to enhance the security of the fence. Sensors attached to the
fence to provide electronic monitoring of cutting or scaling the fence can be used.
Reference(s) used for this question:
Hernandez CISSP, Steven (2012-12-21). Official (ISC)2 Guide to the CISSP CBK, Third
Edition ((ISC)2 Press) (Kindle Locations 24416-24431). Auerbach Publications. Kindle
Edition.

Explanation/Reference:
Updating records in multiple locations or copying an entire database to a remote location as a means to ensure the appropriate levels of fault-tolerance and redundancy is known as Database shadowing.
Shadowing is the technique in which updates are shadowed in multiple locations. It is like copying the entire database on to a remote location.
Shadow files are an exact live copy of the original active database, allowing you to maintain live duplicates of your production database, which can be brought into production in the event of a hardware failure. They are used for security reasons: should the original database be damaged or incapacitated by hardware problems, the shadow can immediately take over as the primary database. It is therefore important that shadow files do not run on the same server or at least on the same drive as the primary database files.
The following are incorrect answers:
Data mirroring In data storage, disk mirroring is the replication of logical disk volumes onto separate physical hard disks in real time to ensure continuous availability. It is most commonly used in RAID 1. A mirrored volume is a complete logical representation of separate volume copies.
Backups In computing the phrase backup means to copy files to a second medium (a disk or tape) as a precaution in case the first medium fails. One of the cardinal rules in using computers is back up your files regularly. Backups are useful in recovering information or a system in the event of a disaster, else you may be very sorry :-(
Archiving is the storage of data that is not in continual use for historical purposes. It is the process of copying files to a long-term storage medium for backup.
Reference(s) used for this question:
Hernandez CISSP, Steven (2012-12-21). Official (ISC)2 Guide to the CISSP CBK, Third Edition ((ISC)2 Press) (Kindle Locations 27614-27626). Auerbach Publications. Kindle Edition.
http://en.wikipedia.org/wiki/Disk_mirroring
http://www.webopedia.com/TERM/A/archive.html
http://ibexpert.net/ibe/index.php?n=Doc.DatabaseShadow

Explanation/Reference:
After a test has been performed the most useful test results for manangement would be knowing what worked and what didn't so that they could correct the mistakes where needed.
The following answers are incorrect:
elapsed time to perform various activities. This is incorrect because it is not the best answer, these results are not as useful as list of successful and unsuccessful activities would be to managment.
amount of work completed. This is incorrect because it is not the best answer, these results are not as useful as list of successful and unsuccessful activities would be to managment.
description of each activity. This is incorrect because it is not the best answer, these results are not as useful as list of successful and unsuccessful activities would be to managment.

Section: Access Control
Explanation
Explanation/Reference:
With Discretionary Access Control, the subject has authority, within certain limitations, to specify what objects can be accessible.
For example, access control lists can be used. This type of access control is used in local, dynamic situations where the subjects must have the discretion to specify what resources certain users are permitted to access.
When a user, within certain limitations, has the right to alter the access control to certain objects, this is termed as user-directed discretionary access control. In some instances, a hybrid approach is used, which combines the features of user-based and identity-based discretionary access control.
References:
KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 33.
and
HARRIS, Shon, All-In-One CISSP Certification Exam Guide 5th Edition, McGraw-Hill/Osborne, 2010, Chapter
4: Access Control (page 210-211).