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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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The time kept on a machine is a critical resource, so Cisco strongly recommends that you use the security features of NTP to avoid the accidental or malicious setting of incorrect time. Two mechanisms are available: an access list-based restriction scheme and an encrypted authentication mechanism.
cisco(config)#ntp ? access-group Control NTP access allow Allow processing of packets authenticate Authenticate time sources authentication-key Authentication key for trusted time sources
answer c and e