|Exception||NTP authentication not enabled|
|Description||"NTP is an important tool for troubleshooting and event correlation. Any network device that is accepting NTP should be protected by a firewall or access lists, or have the services disabled to protect against Denial of Service attacks or attempts at unauthorized usage. NTP is disabled by default."|
|Reference URL||Network Time Protocol Best Practices White Paper|
|Corrective Action||"ntp authentication-key 777 md5 cisco-ntp |
ntp trusted-key 777
ntp server 10.100.0.1 key 777 prefer"
|Caveat||"With NTP authentication enabled, unauthenticated packets are still accepted, which is the lowest validity. To prevent a device from accepting NTP updates from unauthorized servers, use an access list."|
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