What command must be issued on a Cisco router that will serve as an authoritative NTP server?

What command must be issued on a Cisco router that will serve as an authoritative NTP server?

• ntp master 1
• ntp server 172.16.0.1
• ntp broadcast client
• clock set 11:00:00 DEC 20 2010
  

  Answers Explanation & Hints: Routers that will serve as NTP masters must be configured with the ntp master command. A client is configured with the ntp server command so that the client can locate the NTP master. The ntp broadcast client command allows NTP to use to broadcast messages. The clock set command is used to set the time on a router.