A company's legacy server requires administration using Telnet. Which of the following protocols could be used to secure communication by offering encryption at a lower OSI layer? (Select TWO).

IPv6 includes built-in support for IPSec as a mandatory component of its specification, providing encryption and authentication at the network layer (Layer 3). IPSec (C) independently provides encryption, authentication, and integrity checking at Layer 3 via AH and ESP protocols, encapsulating higher-layer protocols like Telnet without requiring changes to the Telnet application itself.

SFTP operates at the application layer (Layer 7) and is a file transfer protocol, not a means of encrypting an existing Telnet session.

SSH operates at the application layer and replaces Telnet rather than encrypting it at a lower OSI layer.

IPv4 does not natively include encryption capabilities and operates at Layer 3 without providing security services.