Which of the following server contingency solutions offers the highest availability?

A.
System backups

B.
Electronic vaulting/remote journaling

C.
Redundant arrays of independent disks (RAID)

D.
Load balancing/disk replication

Explanation:
With load balancing, often through clustering, each system takes a part of the processing load, and if one
system fails there is an automatic failover to the other systems which continue to work. This guarantees a high
availability of the service.
Incorrect Answers:
A: Systems backups only protects against data loss. It does not product a failure of server.
B: Electronic vaulting and remote journaling are transaction redundancy solutions. It protect the system by
copying transaction information to a remote location. In case of server failure the database can be restored, but
it would require a rebuild of the database.
C: RAID protects against a hard disk failures, but it does not protect against other type of server failures.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 1272