NTP: Authentication sha2-256

The device supports authentication type SHA2-256 for NTP authentication. You can now choose SHA2-256 for synchronizing the clocks of Juniper Network routers, switches, and other security devices on the Internet. Using SHA2-256 provides an increased security over SHA-1. To enable SHA2-256 authentication, use set authentication key <key_number> type sha256 value <password> at the [edit system ntp] hierarchy level.