[Solved] An instance has two security groups attached: SG1 allows inbound TCP port 8080 from anywhere, SG2 allows inbound TCP port 8080 only from a... What is the effective inbound rule for port 8080? | AWS

AWS - Security Groups and Network ACLs

An instance has two security groups attached: SG1 allows inbound TCP port 8080 from anywhere, SG2 allows inbound TCP port 8080 only from a specific IP. What is the effective inbound rule for port 8080?

AInbound TCP port 8080 allowed only from the specific IP

BInbound TCP port 8080 allowed from anywhere

CInbound TCP port 8080 blocked because of conflicting rules

DInbound TCP port 8080 allowed only if both rules match

Step-by-Step Solution

Solution:

Step 1: Understand multiple security groups behavior
Rules from all attached security groups are combined with OR logic.
Step 2: Apply to port 8080 rules
Since SG1 allows from anywhere, that rule applies regardless of SG2.
Final Answer:
Inbound TCP port 8080 allowed from anywhere -> Option B
Quick Check:
Multiple SGs combine rules with OR = Inbound TCP port 8080 allowed from anywhere [OK]

Quick Trick: Multiple SGs combine rules with OR logic [OK]

Common Mistakes:

Thinking rules combine with AND logic
Assuming conflicting rules block traffic
Believing both rules must match simultaneously

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More AWS Quizzes

What is the effective inbound rule for port 8080?

Step 1: Understand multiple security groups behavior

Step 2: Apply to port 8080 rules

Final Answer:

Quick Check:

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