Which command is commonly used to monitor real-time traffic on an interface?

The command that is used to monitor real-time traffic on an interface is "show interfaces statistics." This command provides detailed information about the packet counts, error counts, and other relevant statistics for each interface, allowing network administrators to gain insights into the traffic flow and performance in real-time.

Monitoring interface statistics is vital for maintaining optimal network performance and can help in diagnosing issues like high error rates or unexpected changes in traffic patterns. By regularly using this command, admins can track the volume of traffic and quickly identify problem areas or potential bottlenecks within their network infrastructure.

The other commands do not specifically aim to provide real-time traffic monitoring in the same way. For instance, "monitor traffic" is not a standard command found in Junos, while "display interface traffic" may suggest a focus on traffic but lacks the standardization and detail provided by "show interfaces statistics." The command "show interfaces extensive," while offering comprehensive details about the interface, focuses more on the configuration and operational status than on real-time traffic metrics.