Because a network-based IDS reviews packets and headers, denial of service
attacks can also be detected.
This question is an easy question if you go through the process of elimination. When you see an
answer containing the keyword: ALL It is something a give away that it is not the proper answer.
On the real exam you may encounter a few question where the use of the work ALL renders the
choice invalid. Pay close attention to such keyword.
The following are incorrect answers:
Even though most IDSs can detect some viruses and some password guessing attacks, they
cannot detect ALL viruses or ALL password guessing attacks. Therefore these two answers are
only detractors.
Unless the IDS knows the valid values for a certain dataset, it can NOT detect data corruption.
Reference used for this question:
KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of
Computer Security, 2001, John Wiley & Sons, Page 48

The top speed of ISDN BRI is 128 KBS. Its two primary channels are each capable
of carrying 64 KBS so the combined top speed is 128 KBS.

"The Caesar Cipher,...., is a simple substitution cipher that involves shifting the alphabet three positions to the right. The Caesar Cipher is a subset of the Vigenere polyalphabetic cipher. In the Caesar cipher, the message's characters and repetitions of the key are added together, modulo 26. In modulo 26, the letters A to Z of the alphabet are given a value of 0 to 25, respectively."
Pg. 189 Krutz: The CISSP Prep Guide: Gold Edition

Unauthorized access of restricted network services by the circumvention of security access controls is known as logon abuse. This type of abuse refers to users who may be internal to the network but access resources they would not normally be allowed.
Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the
Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 3:
Telecommunications and Network Security (page 74).

A one way hashing function can only be use for the integrity of a message and not for authentication or confidentiality. Because the hash creates just a fingerprint of the message which cannot be reversed and it is also very difficult to create a second message with the same hash.
A hash by itself does not provide Authentication. It only provides a weak form or integrity. It would be possible for an attacker to perform a Man-In-The-Middle attack where both the hash and the digest could be changed without the receiver knowing it.
A hash combined with your session key will produce a Message Authentication Code (MAC) which will provide you with both authentication of the source and integrity. It is sometimes referred to as a Keyed Hash. A hash encrypted with the sender private key produce a Digital Signature which provide authentication, but not the hash by itself.
Hashing functions by themselves such as MD5, SHA1, SHA2, SHA-3 does not provide
authentication.
Source: HARRIS, Shon, All-In-One CISSP Certification Exam Guide, McGraw-Hill/Osborne, 2001,
Page 548