You plan an Azure virtual network with 10 IPv6 subnets, each hosting up to 200 load-balanced VMs. Which IPv6 subnet prefix length should you recommend?
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Correct answer: /64.
Why this is the answer
A /64 IPv6 subnet prefix is the standard and recommended size for most subnets, including those in Azure. It provides 2^64 unique addresses, which is far more than the 200 VMs per subnet needed, ensuring ample room for growth and future services. A /120 prefix is too small, offering only 16 addresses, which is insufficient for 200 VMs. A /48 prefix is excessively large for a single subnet, typically used for an entire site or a large organization's network, not individual subnets. A /24 is an IPv4 prefix length and is not applicable to IPv6 addressing.
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