Subnet Sprint

CIDR maths with a clock chasing you. Azure quietly steals five addresses from every subnet — and the exam absolutely knows it.

AZ-104 Virtual networking — item types no score yet 400 Expert
SKILL TIER

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HOW IT WORKS
Type or tapNumeric and IP answers go in the box — hit Enter. Multiple choice takes 1–4 or a tap.
The clock chasesAnswer before it catches you. Time left becomes score.
Three lives → then noneFrom round 16 it is sudden death: one mistake ends the run, and every point is doubled.
You see the bitsEvery reveal shows the bit boundary, the block size and the five addresses Azure took, so the maths stops being magic.

Azure reserves 5 addresses per subnet, not 2: x.x.x.0 network id, .1 default gateway, .2 and .3 Azure DNS mapping, and the final address as broadcast. Usable = 2(32−prefix) − 5. That single line is worth several exam questions.

AZ-104 track ← Back to hub Press Enter to start
WHAT THIS DRILLS

Item types in the rotation, and the board that fixes each weakness.

The four that kill people: (1) subtracting 2 instead of 5; (2) forgetting GatewaySubnet / AzureFirewallSubnet / AzureBastionSubnet must be named exactly that, with no other resources in them; (3) assuming peering is transitive; (4) planning overlapping address space with on-prem, which quietly removes VPN/ExpressRoute and peering from the table forever.

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