Which statement about a VPN tunnel below is incorrect?

A.
It can be created by implementing node authentication systems.

B.
It can be created by implementing IPSec devices only.

C.
It can be created by implementing key and certificate exchange
systems.

D.
It can be created by installing software or hardware agents on the
client or network.

Explanation:
The correct answer is “It can be created by implementing IPSec devices only”. IPSec-compatible
and non-IPSec compatible devices are used to create VPNs. The other three answers are all
ways in which VPNs can be created.