Which protocol should a network administrator use for an 'always on' encryption setting?

Which protocol should a network administrator use for an 'always on' encryption setting?

• A. SSL
• B. IPsec
• C. SSH
• D. HTTPS

Answer: (B)

The protocol that is most suitable for an 'always on' encryption setting is IPsec. This protocol operates at the network layer and is designed specifically to secure Internet Protocol (IP) communications by authenticating and encrypting each IP packet in a communication session. IPsec is commonly used in Virtual Private Networks (VPNs), allowing continuous and secure communication across potentially insecure networks like the internet.

One of the key features that make IPsec ideal for an 'always on' encryption setting is its capability to secure traffic between multiple devices and networks in a persistent manner. It ensures that all data transmitted is continuously encrypted, providing protection against eavesdropping and tampering without requiring user intervention or session negotiation each time a connection is established.

Other protocols, while useful in specific situations, do not offer the same level of 'always on' service as IPsec. For instance, SSL and HTTPS are primarily used for securing web traffic and require negotiation for each new session. SSH is mainly focused on secure shell access and remote administration, and while it can keep a session encrypted, it is not inherently designed for 'always on' encryption across an entire network infrastructure.