Concurrent use of a firewall, content filtering, antivirus software and an IDS system would be considered
components of:

A.
Redundant systems.

B.
Separation of duties.

C.
Layered security.

D.
Application control.

Explanation:
Layered security is the practice of combining multiple mitigating security controls to protect resources
and data.Incorrect Answers:
A: Redundancy is the duplication of critical components or functions of a system with the intention of
increasing reliability of the system, usually in the form of a backup or fail-safe.
B: Separation of duties is the division of administrator or privileged tasks into distinct groupings, which
are individually assigned to unique administrators. The application of separation of duties prevents a
single user having complete access or power over an entire network, server, or system.
D: Application control is a device-management solution that limits which applications can be installed
onto a device.

http://en.wikipedia.org/wiki/Layered_security
http://en.wikipedia.org/wiki/Redundancy_(engineering)
Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, pp. 82, 272