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NEW QUESTION: 1
The UE may periodically send the SRS within a specified bandwidth, and the SRS may be a broadband mode or a frequency hopping mode.
A. False
B. True
Answer: B
NEW QUESTION: 2
NAMETYPEVALUE
optimizer_adaptive_reporting_onlybooleanFALSE
optimizer_capture_sql_plan_baselinesbooleanFALSE
optimizer_dynamic_samplinginteger2
optimizer_features_enablestring12.1.0.1
A. Option C
B. Option B
C. Option E
D. Option A
E. Option D
Answer: A,D,E
Explanation:
C: During the first execution of a SQL statement, an execution plan is generated as usual.
D: if multi-column statistics are not present for the relevant combination of columns, the
optimizer can fall back on cardinality feedback.
(not B)* Cardinality feedback. This feature, enabled by default in 11.2, is intended to
improve plans for repeated executions.
optimizer_dynamic_sampling optimizer_features_enable
Dynamic sampling or multi-column statistics allow the optimizer to more accurately estimate selectivity of conjunctive predicates.
Note:
* OPTIMIZER_DYNAMIC_SAMPLING controls the level of dynamic sampling performed by
the optimizer.
Range of values. 0 to 10
Cardinality feedback was introduced in Oracle Database 11gR2. The purpose of this
feature is to automatically improve plans for queries that are executed repeatedly, for which
the optimizer does not estimate cardinalities in the plan properly. The optimizer may
misestimate cardinalities for a variety of reasons, such as missing or inaccurate statistics,
or complex predicates. Whatever the reason for the misestimate, cardinality feedback may
be able to help.
NEW QUESTION: 3
Degaussing is used to clear data from all of the following medias except:
A. Video Tapes
B. Read-Only Media
C. Floppy Disks
D. Magnetic Hard Disks
Answer: B
Explanation:
Atoms and Data Shon Harris says: "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"
The latest ISC2 book says:
"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."
Degaussing is achieved by passing the magnetic media through a powerful magnet field to
rearrange the metallic particles, completely removing any resemblance of the previously recorded
signal (from the "all about degaussers link below). Therefore, degaussing will work on any
electronic based media such as floppy disks, or hard disks - all of these are examples of electronic
storage. However, "read-only media" includes items such as paper printouts and CD-ROM wich do
not store data in an electronic form or is not magnetic storage. Passing them through a magnet
field has no effect on them.
Not all clearing/ purging methods are applicable to all media- for example, optical media is not
susceptible to degaussing, and overwriting may not be effective against Flash devices. The
degree to which information may be recoverable by a sufficiently motivated and capable adversary
must not be underestimated or guessed at in ignorance. For the highest-value commercial data,
and for all data regulated by government or military classification rules, read and follow the rules
and standards.
I will admit that this is a bit of a trick question. Determining the difference between "read-only
media" and "read-only memory" is difficult for the question taker. However, I believe it is
representative of the type of question you might one day see on an exam.
The other answers are incorrect because:
Floppy Disks, Magnetic Tapes, and Magnetic Hard Disks are all examples of magnetic storage,
and therefore are erased by degaussing.
A videotape is a recording of images and sounds on to magnetic tape as opposed to film stock
used in filmmaking or random access digital media. Videotapes are also used for storing scientific
or medical data, such as the data produced by an electrocardiogram. In most cases, a helical scan
video head rotates against the moving tape to record the data in two dimensions, because video
signals have a very high bandwidth, and static heads would require extremely high tape speeds.
Videotape is used in both video tape recorders (VTRs) or, more commonly and more recently,
videocassette recorder (VCR) and camcorders. A Tape use a linear method of storing information
and since nearly all video recordings made nowadays are digital direct to disk recording (DDR),
videotape is expected to gradually lose importance as non-linear/random-access methods of
storing digital video data become more common.
Reference(s) used for this question:
Harris, Shon (2012-10-25). CISSP All-in-One Exam Guide, 6th Edition (Kindle Locations 25627-
25630). McGraw-Hill. Kindle Edition.
Schneiter, Andrew (2013-04-15). Official (ISC)2 Guide to the CISSP CBK, Third Edition : Security
Operations (Kindle Locations 580-588). . Kindle Edition.
All About Degaussers and Erasure of Magnetic Media:
http://www.degausser.co.uk/degauss/degabout.htm
http://www.degaussing.net/
http://www.cerberussystems.com/INFOSEC/stds/ncsctg25.htm