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Given this route table for a subnet:

medium📝 Predict Output Q13 of 15
AWS - VPC Fundamentals
Given this route table for a subnet:
Destination: 0.0.0.0/0, Target: igw-12345
What type of subnet is this likely to be?
APublic subnet with internet access
BPrivate subnet with no internet access
CIsolated subnet with VPN only
DSubnet with NAT gateway only
Step-by-Step Solution
Solution:

  1. Step 1: Analyze route table destination and target

    The route directs all internet traffic (0.0.0.0/0) to an internet gateway (igw), which enables internet access.

  2. Step 2: Determine subnet type from routing

    Routing to an internet gateway means the subnet is public and can access the internet directly.

  3. Final Answer:

    Public subnet with internet access -> Option A

  4. Quick Check:

    Route to IGW = public subnet [OK]
Quick Trick: Route 0.0.0.0/0 to IGW means public subnet [OK]
Common Mistakes:
  • Assuming NAT gateway means public subnet
  • Confusing IGW with VPN or NAT
  • Ignoring route table targets

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