The MDB chassis tub assembly vertical distribution board provides connectivity to which chassis components?

Question

Options

• AFive near fan modules
• BFour cooling fans and four fabric I/O modules
• CPower supplies, compute sleds, Management Modules, and two fabric I/O modules
• DPear power supplies, compute sleds, Management Modules, and all fabric I/O modules

• B
  92% (12)
• D
  8% (1)

Explanation

Option B is correct because the vertical distribution board (VDB) in the MDB chassis tub assembly serves as the primary connectivity backbone for the four cooling fans and four fabric I/O modules - the components physically housed within the tub itself that require vertical signal and power routing.

• A is wrong because "five near fan modules" is an inaccurate count and description; the VDB connects to four cooling fans, not five, and they aren't called "near fan modules."
• C is wrong because power supplies, compute sleds, Management Modules, and fabric I/O modules describe connectivity handled by the midplane or other distribution boards, not specifically the vertical distribution board in the tub assembly. The VDB's scope is narrower.
• D is wrong for the same reason as C, and additionally includes all fabric I/O modules, which overstates the VDB's reach - it connects to only four fabric I/O modules, not all of them across the chassis.

Memory tip: Think "VDB = Vertical = inside the tub" - the vertical distribution board handles the internal tub components: 4 fans + 4 fabric I/O modules (two sets of four). The "4+4" pairing makes B easy to recall.

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