An application in a multi-tier AWS architecture is failing to serve requests. The web tier is in a public subnet, but users cannot reach it. What is a likely misconfiguration?

medium📝 Debug Q7 of 15

AWS - Architecture Best Practices

AThe app tier is missing an internet gateway

BThe web tier instances lack a public IP address

CThe database tier is in a private subnet

DThe NAT gateway is in the public subnet

Step-by-Step Solution

Solution:

Step 1: Understand public subnet requirements
Instances in public subnets need public IPs to be reachable from the internet.
Step 2: Identify cause of unreachable web tier
Without public IPs, web tier instances cannot receive internet traffic.
Final Answer:
The web tier instances lack a public IP address -> Option B
Quick Check:
Missing public IP blocks internet access = C [OK]

Quick Trick: Public subnet needs public IP for internet access [OK]

Common Mistakes:

Blaming database subnet
Confusing app tier internet gateway
Misunderstanding NAT gateway role

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An application in a multi-tier AWS architecture is failing to serve requests. The web tier is in a public subnet, but users cannot reach it. What is a likely misconfiguration?

Step 1: Understand public subnet requirements

Step 2: Identify cause of unreachable web tier

Final Answer:

Quick Check:

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