Final answer:
SSH, or Secure Shell, is the protocol that allows a secure command-line terminal interface with a remote system, encrypting the session to protect against network attacks.
Step-by-step explanation:
The remote access protocol that allows a command-line terminal interface with a remote system is SSH (Secure Shell). Unlike HTTP and SNMP, which are used for web browsing and network management respectively, or FTP, which is used for transferring files, SSH provides a secure channel over an unsecured network in a client-server architecture, allowing users to log into another computer over a network, execute commands in a remote machine, and move files from one machine to another. It encrypts the session, making the connection secure from eavesdropping, connection hijacking, and other attacks.