We can Provide NTP Security in the routers by using two methods
1) NTP Access Control
2) NTP Authentication
1) NTP Access Control
--> Restricts the NTP messages sent by the clients.
i) Peer:
--> Allows the router to respond NTP requests
--> Updates the clock with the other devices, if it gets the time from other devices.( NTP Updates)
---> Accepts Queries also which are used for SNMP.
ii) Serve
--> Allows the router to respond NTP requests
--> Does not accept NTP updates.
--> Accepts Queries.
iii) Serve-only
--> Allows the router to respond NTP requests
---> Does not accept NTP updates.
--> Does not accept Queries
iv) Query-only
--> Does not respond to NTP requests.
--> Does not accept NTP updates.
--> Accepts Queries.
NTP Authentication
---> Checks the NTP Source whether it is valid or not...
1) NTP Access Control
2) NTP Authentication
1) NTP Access Control
--> Restricts the NTP messages sent by the clients.
i) Peer:
--> Allows the router to respond NTP requests
--> Updates the clock with the other devices, if it gets the time from other devices.( NTP Updates)
---> Accepts Queries also which are used for SNMP.
ii) Serve
--> Allows the router to respond NTP requests
--> Does not accept NTP updates.
--> Accepts Queries.
iii) Serve-only
--> Allows the router to respond NTP requests
---> Does not accept NTP updates.
--> Does not accept Queries
iv) Query-only
--> Does not respond to NTP requests.
--> Does not accept NTP updates.
--> Accepts Queries.
NTP Authentication
---> Checks the NTP Source whether it is valid or not...
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