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AWS Certified Solutions Architect - Associate · AWS
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In an Amazon VPC, the first four and the last IP address in each subnet are reserved for specific purposes, and they cannot be used for customer instances. Here's how the reserved addresses are typically allocated: Network Address (First IP): The first IP address (all zeros in the host portion) in a subnet is reserved as the network address. For example, if you have a subnet with a CIDR notation of 10.0.0.0/24, the network address would be 10.0.0.0. VPC Router (Second IP): The second IP address in the subnet is reserved for the VPC router. DNS Server (Third IP): The third IP address is reserved for the DNS server. Reserved for Future Use (Fourth IP): The fourth IP address is reserved for future use. Customer Instances (Fifth to Second-to-Last IP): The IP addresses from the fifth to the second-to-last IP address in the subnet are available for customer instances. Broadcast Address (Last IP): The last IP address (all ones in the host portion) in a subnet is reserved as the broadcast address, even though AWS does not support broadcast.
10.0.0.0 - 10.255.255.255 (10/8 prefix): Example CIDR block: 10.0.0.0/16 172.16.0.0 - 172.31.255.255 (172.16/12 prefix): Example CIDR block: 172.31.0.0/16 192.168.0.0 - 192.168.255.255 (192.168/16 prefix): Example CIDR block: 192.168.0.0/20 Given that the development VPC already uses 192.168.0.0/24, we need to choose a non-overlapping CIDR block. The smallest valid CIDR block that meets the requirements is 192.168.1.0/24 (Option C).
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