An engineer creates a custom VPC (10.50.0.0/16) and an Internet Gateway (IGW). They immediately try to attach the IGW to a newly created subnet (10.50.1.0/24). Why does the AWS Management Console/CLI throw an error?

Question

CHINMAYA M · Accepted Answer

An IGW is attached to a VPC, not a subnet. To provide internet access to a subnet, configure its route table with 0.0.0.0/0 pointing to the IGW.

CHINMAYA M · Answer

Step 1: Host bits32 − 28 = 4Step 2: Total IP addresses(2^4 = 16)Step 3: AWS reserved IPs5 IP addresses.Step 4: Usable IPs16 − 5 = 11Final Answer: 11 EC2 instance

CHINMAYA M · Answer

AWS throws an error because an IGW can only be attached to a VPC, not a subnet. Configure the subnet's route table to enable internet access.

An engineer creates a custom VPC (10.50.0.0/16) and an Internet Gateway (IGW). They immediately try to attach the IGW to a newly created subnet (10.50.1.0/24). Why does the AWS Management Console/CLI throw an error?

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