Which NTP command configures the local devices as an NTP reference clock source?

Question:
Which NTP command configures the local devices as an NTP reference clock source?

• NTP Peer
• NTP Broadcast
• NTP Master
• NTP Server

Explanation: From a Cisco perspective, getting the clock from an Internet time source and/or from a local timing device both require the same command (ntp server). To have a specific network device consider itself as a reference clock source, another command is used (ntp master)

For example, the command

Router(config)#ntp server 192.168.1.1

configures the local device to use a remote NTP clock source from 192.168.1.1 while the command:

Router(config)#ntp master 1

configures the local device as a NTP reference clock source with stratum of 1.

Reference: http://www.pearsonitcertification.com/articles/article.aspx?p=2141272

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