You plan to implement an Azure virtual network that will contain 10 virtual subnets. The subnets will use IPv6 addresses. Each subnet will host up to 200 load-balanced virtual machines. You need to re

The correct answer is A. /64. The subnets for IPv6 must be exactly /64 in size. This ensures future compatibility should you decide to enable routing of the subnet to an on-premises network since some routers can only accept /64 IPv6 routes. https://learn.microsoft.com/en-us/azure/virtual-network/ip-services/

Submitted by khalil_dz· Apr 18, 2026

Question

You plan to implement an Azure virtual network that will contain 10 virtual subnets. The subnets will use IPv6 addresses. Each subnet will host up to 200 load-balanced virtual machines. You need to recommend which subnet mask size to use for the virtual subnets. What should you recommend?

Options

A/64
B/120
C/48
D/24

How the community answered

(33 responses)

A
82% (27)
B
9% (3)
C
6% (2)
D
3% (1)

Explanation

The subnets for IPv6 must be exactly /64 in size. This ensures future compatibility should you decide to enable routing of the subnet to an on-premises network since some routers can only accept /64 IPv6 routes. https://learn.microsoft.com/en-us/azure/virtual-network/ip-services/ipv6-overview#capabilities

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