Section: Network and Telecommunications
Explanation/Reference:
A smurf attack occurs when an attacker sends a spoofed (IP spoofing) PING (ICMP ECHO) packet to the broadcast address of a large network (the bounce site). The modified packet containing the address of the target system, all devices on its local network respond with a ICMP REPLY to the target system, which is then saturated with those replies. An IP spoofing attack is used to convince a system that it is communication with a known entity that gives an intruder access. It involves modifying the source address of a packet for a trusted source's address. A teardrop attack consists of modifying the length and fragmentation offset fields in sequential IP packets so the target system becomes confused and crashes after it receives contradictory instructions on how the fragments are offset on these packets. A SYN attack is when an attacker floods a system with connection requests but does not respond when the target system replies to those requests.
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
76).

of Service

The AIC triad is: availability, integrity, and confidentiality. This is a key concept of security.

Explanation/Reference:
Reference: Arsenault, Turner, Internet X.509 Public Key Infrastructure: Roadmap, Chapter "Terminology".
Also note that sometimes other terms such as Certification Authority Anchor (CAA) might be used within some government organization, Top level CA is another common term to indicate the top level CA, Top Level Anchor could also be used.

Banners at the log-on time should be used to notify external users of any
monitoring that is being conducted. A good banner will give you a better legal stand and
also makes it obvious the user was warned about who should access the system and if it is
an unauthorized user then he is fully aware of trespassing.
This is a tricky question, the keyword in the question is External user.
There are two possible answers based on how the question is presented, this question
could either apply to internal users or ANY anonymous user.
Internal users should always have a written agreement first, then logon banners serve as a
constant reminder.
Anonymous users, such as those logging into a web site, ftp server or even a mail server;
their only notification system is the use of a logon banner.
References 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 50. and Shon Harris, CISSP All-in-one, 5th edition, pg 873