Section: Network and Telecommunications
Explanation/Reference:
Asynchronous Communication is the basic language of modems and dial-up remote access systems.
Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 100.

Section: Cryptography
Explanation/Reference:
The Rijndael algorithm, chosen as the Advanced Encryption Standard (AES) to replace DES, can be categorized as an iterated block cipher with a variable block length and key length that can be independently chosen as 128, 192 or 256 bits.
Below you have a summary of the differences between AES and Rijndael.
AES is the advanced encryption standard defined by FIPS 197. It is implemented differently than Rijndael:
FIPS-197 specifies that the block size must always be 128 bits in AES, and that the key size may be either 128,
192, or 256 bits. Therefore AES-128, AES-192, and AES-256 are actually:
Key Size (bits) Number of rounds
Block Size (bits)
AES-128
128 10 Rounds
128
AES-192
192 12 Rounds
128
AES-256
256 14 Rounds
128
Some book will say "up to 9 rounds will be done with a 128 bits keys". Really it is 10 rounds because you must include round zero which is the first round.
By contrast, the Rijndael specification per se is specified with block and key sizes that may be any multiple of
32 bits, both with a minimum of 128 and a maximum of 256 bits.
Reference(s) used for this question:
KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 4: Cryptography (page 153).
and
FIPS 197
and
https://en.wikipedia.org/wiki/Advanced_Encryption_Standard

Explanation/Reference:
A sag is a momentary low voltage. A spike is a momentary high voltage. A fault is a momentary power out and a brownout is a prolonged power supply that is below normal voltage.
Source: HARRIS, Shon, All-In-One CISSP Certification Exam Guide, McGraw-Hill/Osborne, 2002, chapter
6: Physical security (page 299)

Explanation/Reference:
The principle of least privilege refers to allowing users to have only the access they need and not anything more. Thus, certain users may have no need to access any of the files on specific systems.
The following answers are incorrect:
Users can access all systems. Although the principle of least privilege limits what access and systems users have authorization to, not all users would have a need to know to access all of the systems. The best answer is still Users would get access to only the info for which they have a need to know as some of the users may not have a need to access a system.
Users get new privileges when they change positions. Although true that a user may indeed require new privileges, this is not a given fact and in actuality a user may require less privileges for a new position. The principle of least privilege would require that the rights required for the position be closely evaluated and where possible rights revoked.
Authorization creep. Authorization creep occurs when users are given additional rights with new positions and responsibilities. The principle of least privilege should actually prevent authorization creep.
The following reference(s) were/was used to create this question:
ISC2 OIG 2007 p.101,123
Shon Harris AIO v3 p148, 902-903

Source: TIPTON, Harold F. & KRAUSE, MICKI, Information Security Management Handbook, 4th Edition, Volume 2, 2001, CRC Press, NY, page 164.