Cisco Certified Network Associate (CCNA) Practice Exam

What command instructs the device to timestamp Syslog debug messages in milliseconds?

1. (config)#service timestamps debug datetime msec

2. (config)#set timestamps mode debug datetime

3. (config)#enable timestamps debug datetime msec

4. (config)#config timestamps format debug datetime

The correct answer is: (config)#service timestamps debug datetime msec

The command that instructs the device to timestamp Syslog debug messages in milliseconds is indeed the one that specifies the use of the service timestamps feature with debug messages. Using "service timestamps debug datetime msec" sets the device configuration to include a timestamp with each debug message sent to Syslog, and it formats this timestamp to include milliseconds. This granularity is crucial when tracking events in a system where precise timing is necessary, often to troubleshoot issues or analyze performance more effectively. The structure of the command indicates that it falls under the category of services related to timestamps, specifically targeted at debug output. It ensures that every debug log generated will reflect the time with a resolution down to the millisecond, enhancing the ability to correlate events and actions within the network. The other options do not accurately represent the command required for achieving this specific functionality. They either mention other configurations, incorrect syntax, or misrepresent the needed timestamp granularity.