Which command shows the status of power supplies and sensor temperatures?

Samuel O.Oct 19, 2025

C is your answer. The "show environment" command is exactly what the name implies, it monitors the physical environment of the device, power supply status, fan operation, and temperature readings from onboard sensors, which is what you reach for any time you are troubleshooting hardware health or verifying a chassis is running within safe thermal limits.

Bao N.Oct 23, 2025

Took the 100-890 three weeks ago and this one showed up almost word for word. The trick is that show hardware and show diag sound like they would cover physical health stuff, but those commands are more about inventory and slot details, not live readings. show environment is the one that gives you the operational status of power supplies, fans, and temperature sensors all in one output, which is exactly what the question is asking about. I almost second-guessed myself because I kept confusing show module with environmental data from studying a sloppy dump, but show module is really about line card and module status, not thermals or PSU health. Go with C every time you see a question about live sensor or power supply status.

Brenda K.Oct 26, 2025

Clock check first: this one is a quick win, do not flag it, answer and move on. I keep coming back to A, show hardware, because the word "hardware" is the broadest physical descriptor on the list and power supplies and temperature sensors are both physical components of the chassis. When I ran through the Cisco Catalyst switch labs in my prep material, show hardware pulled back a full picture of the physical environment including fan trays and power status, which lines up perfectly with what the question is asking. Show environment sounds tempting but in my experience that command is more focused on interface counts and slot inventory, not the thermal and power readings. Stick with A and bank the time you saved for the drag-and-drop topology beast hiding at question 47.