Which of the following is a control over component communication failure/errors?

A.
Restricting operator access and maintaining audit trails

B.
Monitoring and reviewing system engineering activity

C.
Providing network redundancy

D.
Establishing physical barriers to the data transmitted over the network

Explanation:
Redundancy by building some form of duplication into the network components, such as a link, router or switch
to prevent loss, delays or data duplication is a control over component communication failure or error. Other
related controls are loop/echochecks to detect line errors, parity checks, error correction codes and sequence
checks. Choices A, B and D are communication network controls.