Which of the following is a proper characteristic of SKIP and ISAKMP?

A.
They work at the application layer

B.
They work at the transport layer

C.
They work at the data link layer

D.
They work at the network layer

Explanation:
SKIP (Simple Key management for IP) and ISAKMP (Internet Security
Association and Key Management Protocol) are both key exchange protocols that can be
used by IPSec. The de facto standard for IPSec is to use IKE (Internet Key
Exchange), which is a combination of ISAKMP and the Oakley protocol. SKIP, ISAKMP,
and IPSec work at the network layer.