Alan is worried about the security of his NTP time synchronization service because he understands that protocols such as TLS and BGP are vulnerable to issues if false NTP messages can cause time discrepancies between systems. Which tool can he use to swiftly secure his NTP traffic between Linux systems?

The most efficient method for Alan to secure his Network Time Protocol (NTP) traffic is usually to use Secure Shell (SSH) to tunnel the traffic from the NTP server to her Linux systems. Setting up and maintaining an IPSec virtual private network (VPN) between devices usually requires more effort, although it can be automated with scripting, and configuring a Transport Layer Security (TLS) VPN would require additional work since it is designed for web traffic. Remote Desktop Protocol (RDP) is mainly used for Windows systems and would not be a suitable option. However, in most environments, NTP traffic is not given any special security, and NTP sources are trusted to function without any extraordinary security measures.