AWS VPC and Subnet Fundamentals

15 cards0 clones

Flashcards (15)

Card 1

What is the primary function of a subnet within a VPC?

A subnet provides a grouping for resources inside a VPC, acting as a smaller, isolated network where you place resources like EC2 instances or RDS databases.

Card 2

Explain the relationship between a VPC's CIDR block and a subnet's CIDR block.

The CIDR block of a subnet must always be a subset of the VPC's CIDR block. This means a subnet's IP range must entirely fall within the VPC's IP range.

Card 3

What is the minimum allowed CIDR range for a subnet in AWS, and how many IP addresses does it provide?

The minimum subnet range allowed by AWS is /28, which provides 16 IP addresses (2^(32-28) = 16).

Card 4

How many IP addresses does AWS reserve in every subnet, and what are their purposes?

AWS reserves 5 IP addresses in every subnet. These are typically for network address, VPC router, DNS, future use, and network broadcast address.

Card 5

If a subnet has a /28 CIDR block, how many usable IP addresses are available for resources?

For a /28 subnet (16 total IPs), AWS reserves 5, leaving 11 usable IP addresses for resources.

Card 6

What is a Default VPC, and what are its typical characteristics?

Card 7

Can the CIDR block of a VPC be extended after creation?

Card 8

Can the CIDR block of a subnet be changed or resized after creation?

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