The port numbers are divided into three ranges: the Well Known Ports, the Registered Ports, and the Dynamic and/or Private Ports. The range for assigned "Well Known" ports managed by the IANA (Internet Assigned Numbers Authority) is 0-1023.
Source: iana.org: port assignments.

Users tend to choose easier to remember passwords. System-generated passwords can provide stronger, harder to guess passwords. Since they are based on rules provided by the administrator, they can include combinations of uppercase/lowercase letters, numbers and special characters, making them less vulnerable to brute force and dictionary attacks. One danger is that they are also harder to remember for users, who will tend to write them down, making them more vulnerable to anyone having access to the user's desk. Another danger with system-generated passwords is that if the password-generating algorithm gets to be known, the entire system is in jeopardy. Source: RUSSEL, Deborah & GANGEMI, G.T. Sr., Computer Security Basics, O'Reilly, July 1992 (page 64).

Explanation/Reference:
The following are incorrect answers because they are all suitable methods.
A Delta CRL is a CRL that only provides information about certificates whose statuses have changed since the issuance of a specific, previously issued CRL.
The Online Certificate Status Protocol (OCSP) is an Internet protocol used for obtaining the revocation status of an X.509 digital certificate.
A Distribution point CRL or CRL Distribution Point, a location specified in the CRL Distribution Point (CRL DP) X.509, version 3, certificate extension when the certificate is issued.
References:
RFC 2459: Internet X.509 Public Key Infrastru
http://csrc.nist.gov/groups/ST/crypto_apps_infra/documents/sliding_window.pdf
http://www.ipswitch.eu/online_certificate_status_protocol_en.html
Computer Security Handbook By Seymour Bosworth, Arthur E. Hutt, Michel E. Kabay http:// books.google.com/books?id=rCx5OfSFUPkC&printsec=frontcover&dq=Computer+Security
+Handbook#PRA6-PA4,M1

Direct evidence can prove a fact all by itself and does not need backup information to refer to. When using direct evidence, presumptions are not required. One example of direct evidence is the testimony of a witness who saw a crime take place. Although this oral evidence would be secondary in nature, meaning a case could not rest on just it alone, it is also direct evidence, meaning the lawyer does not necessarily need to provide other evidence to back it up. Direct evidence often is based on information gathered from a witness's five senses.
The following answers are incorrect:
Circumstantial evidence. Is incorrect because Circumstantial evidence can prove an intermediate fact that can then be used to deduce or assume the existence of another fact. Conclusive evidence. Is incorrect because Conclusive evidence is irrefutable and cannot be contradicted. Conclusive evidence is very strong all by itself and does not require corroboration.
Corroborative evidence. Is incorrect because Corroborative evidence is supporting evidence used to help prove an idea or point. It cannot stand on its own, but is used as a supplementary tool to help prove a primary piece of evidence.

Audit trails maintain a record of system activity by system or application processes and by user activity. In conjunction with appropriate tools and procedures, audit trails can provide individual accountability, a means to reconstruct events, detect intrusions, and identify problems. Audit trail controls are considered technical controls. Monitoring and tracking of incidents is more an operational control related to incident response capability.