After completed use of the SKL and powered off you must wait at least _____ before powering back on?

• A. 30 seconds
• B. 1 minute
• C. 2 minutes
• D. 5 minutes

Answer: (C)

The idea being tested is the proper power-cycle delay for the SKL before you power it back on. After you finish using the SKL and shut it down, you need a short cooling-off period to let the device fully reset and to clear any transient states. Waiting two minutes gives time for internal circuits to discharge, for the crypto state to be securely reset, and for any automatic clearance or self-check processes to complete. If you restart too soon, the SKL may not boot reliably or could start from an incomplete or risky state, which could affect security and operation. The two-minute interval is the minimum that ensures a safe, clean restart and reduces the chance of issues on the next power-up. Shorter intervals (such as 30 seconds or a minute) may be insufficient, while a longer wait (like five minutes) isn’t generally required by standard practice.