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A VPC has a route table missing a route to the internet gateway. What is the effect on network isolation?

medium📝 Debug Q7 of 15
AWS - VPC Fundamentals
A VPC has a route table missing a route to the internet gateway. What is the effect on network isolation?
AInstances cannot access the internet but remain isolated
BInstances lose all network connectivity
CInstances can access the internet without restrictions
DThe VPC automatically adds the missing route
Step-by-Step Solution
Solution:

  1. Step 1: Understand route table role

    Route tables control traffic flow; missing internet gateway route blocks internet access.

  2. Step 2: Assess network isolation impact

    Instances remain isolated from the internet but can communicate inside the VPC.

  3. Final Answer:

    Instances cannot access the internet but remain isolated -> Option A

  4. Quick Check:

    Missing internet route blocks internet, not internal traffic [OK]
Quick Trick: No internet route means no internet access [OK]
Common Mistakes:
MISTAKES
  • Assuming no connectivity at all without internet route
  • Believing AWS auto-adds missing routes
  • Thinking instances can access internet without route

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