The show cpu tasks command on a RUCKUS ICX switch provides a detailed, real-time breakdown of CPU utilization for each individual software task or process running on the device. When troubleshooting a high CPU alert, this command is essential as it allows an administrator to pinpoint the exact process consuming excessive CPU cycles. The output typically includes the task name, its status, priority, and the percentage of CPU it is currently using, which is the specific information needed to diagnose the cause of the high utilization.

A. show cpu histogram: This command displays a historical distribution of overall CPU load over time, not the real-time consumption by individual processes.

C. show cpu: This command provides a high-level summary of total CPU utilization over different time intervals (e.g., last second, last minute) but lacks per-process detail.

D. show process: This is not the correct or most specific command on RUCKUS ICX devices for viewing detailed CPU usage by process; show cpu tasks serves this function.

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1. RUCKUS FastIron Command Reference Guide, 08.0.95

Reference for Correct Answer (B): In the chapter "Show Commands," the description for show cpu tasks states, "Displays CPU utilization for individual software tasks (processes) running on the device." This command's output table includes a "%CPU" column, directly addressing the question's need. (Part Number: 53-1005578-01, Page 1998)

Reference for Incorrect Answer (A): The description for show cpu histogram states, "Displays a histogram of CPU utilization over a period of time." (Part Number: 53-1005578-01, Page 1997)

Reference for Incorrect Answer (C): The description for show cpu states, "Displays the percentage of CPU utilization." The output shows overall utilization, not a process-level breakdown. (Part Number: 53-1005578-01, Page 1996)

2. RUCKUS FastIron Monitoring Configuration Guide, 08.0.90

Reference for Correct Answer (B): In the chapter "Monitoring System Resources," the section "Displaying CPU utilization for individual tasks" explicitly recommends using the show cpu tasks command to "display CPU utilization for individual software tasks (processes) running on the device." (Part Number: 53-1005262-01, Page 21)