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Which three NTP features can be deduced on the router? (choose 3)
A. only accepts time requests from 192.168.1.1
B. only handle four requests at a time
C. only is in stratum 4
D. only updates its time from 192.168.1.1
E. only accepts time requests from 192.168.1.4
F. only updates its time from 192.168.1.4
Correct Answer: ACF
Explanation/Reference:
IOS router defines the following four types of access for NTP:
1) Peer – permits router to respond to NTP requests and accept NTP updates. NTP control queries are also accepted. This is the only class which allows a router to be synchronized by other devices.
2) Serve – permits router to reply to NTP requests, but rejects NTP updates (e.g. replies from a server or update packets from a peer). Control queries are also permitted.
3) Serve-only – permits router to respond to NTP requests only. Rejects attempt to synchronize local system time, and does not access control queries.
4) Query-only – only accepts NTP control queries. No response to NTP requests are sent, and no local system time synchronization with remote system is permitted.
http://blog.ine.com/2008/07/28/ntp-access-control
