A company receives their first MX7000 chassis. They connect all the provided power supply cables into two different PDUs on different power grids for redundancy. Each of the six power supplies is…

Question

Options

• AAn additional IOM is required to power on and manage the remaining sleds.
• BTwo Management Modules are required to power on the populated chassis.
• CPower supply unit redundancy policy was not used.
• DMixed high line and low line AC inputs in the same chassis is not supported.

• A
  9% (3)
• B
  20% (7)
• C
  66% (23)
• D
  6% (2)

Explanation

Option C is correct because the MX7000's Grid Redundancy mode splits the six PSUs across two grids (3 per grid) and reserves an entire grid as standby - meaning only half the total PSU capacity is available to power sleds. With only three PSUs' worth of usable power, the chassis lacks the capacity to power all six compute sleds, so only two come on. Switching to PSU Redundancy mode (which reserves just one PSU) would make five PSUs' worth of power available, enabling more sleds to power on.

Why the distractors are wrong:

• A - A single IOM is sufficient for sled operation; a second IOM adds network redundancy but is not a power-on requirement.
• B - One Management Module is enough to manage and power on the chassis; the second is optional for MM redundancy.
• D - All six PSUs show green LEDs, confirming there is no AC input mismatch; a high/low line conflict would cause PSU faults, not selective sled power failures.

Memory tip: Think of Grid Redundancy as "half power, full grid backup" - you sacrifice 50% of your PSU capacity to ensure a whole grid can fail safely. If sleds won't power on but PSUs look healthy, always check whether the redundancy policy is consuming the capacity you think you have.

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