In order to ensure the privacy and integrity of the data, connections between firewalls over public
networks should use?
A.
Screened subnets
B.
Digital certificates
C.
Encrypted Virtual Private Networks
D.
Encryption
Explanation:
This is the correct answer, since firewall does not mean “VPN” we have to select
“Encrypted Virtual Private Networks”. With a VPN and encryption we can provide secure
communication in a transparent way for the users between the endpoints achieving
“Confidentiality”. This confidentiality is achieved through encryption, and this encryption relies on
encryption algorithms like AES, DES, CAST and others. Screened Subnet are not related to
secure data over public networks, it’s a place to put our network services accessible from the
outside. Digital certificates do not provide confidentiality, they only provide integrity.