An overview of zone console and user login methods is provided in Non-Global Zone Login Methods.
The failsafe mode is used when a login problem occurs that prevents you from using the zlogin command or the zlogin command with the -C option to access the zone. This mode is described in Failsafe Mode
Information on remote login zone is provided in Remote Login
Interactive mode allocates a new pseudo-terminal for use inside the zone. Non-interactive mode is used to run shell-scripts which administer the zone. See Interactive and Non-Interactive Modes for more information.