Which of the following best describes a characteristic of IPSec?

A.
Provides system authentication

B.
Provides content filtering

C.
Works as a proxy

D.
Provides application layer protection

Explanation:
IPSec uses message authentication code (MAC) to provide data origin
authentication, which means the receiving system knows what system sent the data.
This does not mean that the actual user is authenticated, only the system that sent
the information. If user authentication was required then credentials would need to
be sent and verified or a digital signature would need to be used. A symmetric key
is not bound to an individuals identity as credentials and private keys are.