Redundancy and Patching

Can you identify the differences between redundancy and patching when discussing core security goals? You should if you plan to take the Security+ exam. As an example, see if you can answer this sample Security+ question?

Your organization recently implemented two servers that act as failover devices for each other. Which security goal is your organization pursuing?

A. Safety

B. Integrity

C. Confidentiality

D. Availability

You can see the answer and full explanation here.