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If a subnet's route table has:

medium📝 Predict Output Q5 of 15
AWS - VPC Fundamentals
If a subnet's route table has:
Destination: 0.0.0.0/0, Target: igw-xyz789
and instances have no public IP, what is the expected behavior?
AInstances can access the internet normally.
BInstances cannot access the internet despite the IGW route.
CInstances can only receive inbound traffic, not send outbound.
DInstances will use a NAT Gateway automatically.
Step-by-Step Solution
Solution:

  1. Step 1: Check route table and IP assignment

    The route table points to an internet gateway, but instances lack public IPs.

  2. Step 2: Understand internet access requirements

    Without public IPs, instances cannot communicate directly with the internet even with IGW route.

  3. Final Answer:

    Instances cannot access the internet despite the IGW route. -> Option B

  4. Quick Check:

    IGW route + no public IP = no internet access [OK]
Quick Trick: Public IP needed for IGW internet access [OK]
Common Mistakes:
MISTAKES
  • Assuming IGW route alone grants internet access
  • Confusing NAT Gateway automatic use
  • Thinking inbound only traffic is possible without public IP

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