GCP Professional Cloud Security Engineer Practice Question
Your team is creating an internal-only subnet in a new VPC. The security architect mandates that the subnet must use an IPv4 range that is officially reserved for private, non-routable addressing under RFC 1918 to prevent direct internet routing. Which of the following CIDR blocks satisfies this requirement?
RFC 1918 defines three private IPv4 ranges: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. Any block that falls wholly within one of these ranges is considered private and is not routed on the public internet. The block 172.20.0.0/16 is inside the 172.16.0.0/12 private range, so it meets the requirement. The 100.96.0.0/12 space belongs to the carrier-grade NAT range defined in RFC 6598, 198.19.0.0/16 is reserved for benchmarking, and 203.0.113.0/24 is a public documentation range; none of these are RFC 1918 private networks.
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What does RFC 1918 define?
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What is CIDR and why is it important in subnetting?
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What is the difference between RFC 1918 and RFC 6598 address ranges?
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What are CIDR blocks?
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What is RFC 1918 and why is it important?
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What is the difference between carrier-grade NAT (RFC 6598) and private IPs (RFC 1918)?
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GCP Professional Cloud Security Engineer
Securing communications and establishing boundary protection
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