Which two mechanisms can be used to secure NTP?
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Correct answer: encrypted authentication, IP access list-based.
Why this is the answer
Encrypted authentication (using MD5 or SHA) ensures that NTP packets are legitimate and haven't been tampered with, preventing unauthorized time synchronization. IP access list-based filtering restricts which IP addresses are allowed to send or receive NTP packets, providing a basic layer of access control. IPsec can secure NTP traffic but is a broader VPN technology, not a native NTP security mechanism. IP prefix list-based and TACACS-based authentication are not standard or native security features for NTP itself.
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