What is the smallest and largest CIDR network subnet block you can assign for your VPC?

What is the smallest and largest CIDR network subnet block you can assign for your VPC?

• A. /24 and /16
• B. /32 and /8
• C. /20 and /12
• D. /28 and /17

Answer: (A)

The concept being tested is how CIDR block sizes work for a VPC and what ranges are allowed. In most cloud environments, the size of a VPC’s CIDR block is defined by the prefix length: shorter prefixes mean larger address spaces, while longer prefixes mean smaller spaces. For a VPC, the valid range is between /16 and /28, inclusive. That means the largest block you can assign is /16 and the smallest is /28. So, when asked for the smallest and largest possible blocks, the extremes are /28 and /16. Among the given options, the one that includes the largest allowed block (/16) is the one paired with /24, which makes it the best match within the choices. The other options either use block sizes outside the allowed range or don’t pair the extreme sizes correctly (for example, /32 is far too small for a VPC, /8 is far too large, and /12 would be outside the permitted range as a pair). The key idea is to remember the VPC CIDR size limits and how prefix length relates to the size of the address space.

The concept being tested is how CIDR block sizes work for a VPC and what ranges are allowed. In most cloud environments, the size of a VPC’s CIDR block is defined by the prefix length: shorter prefixes mean larger address spaces, while longer prefixes mean smaller spaces. For a VPC, the valid range is between /16 and /28, inclusive. That means the largest block you can assign is /16 and the smallest is /28.

So, when asked for the smallest and largest possible blocks, the extremes are /28 and /16. Among the given options, the one that includes the largest allowed block (/16) is the one paired with /24, which makes it the best match within the choices. The other options either use block sizes outside the allowed range or don’t pair the extreme sizes correctly (for example, /32 is far too small for a VPC, /8 is far too large, and /12 would be outside the permitted range as a pair). The key idea is to remember the VPC CIDR size limits and how prefix length relates to the size of the address space.