If a security group has an inbound rule allowing TCP port 3306 from 192.168.1.0/24 and no outbound rules, what will happen when an application tries to connect to a MySQL database on port 3306?

medium📝 service behavior Q5 of 15

AWS - Security Groups and Network ACLs

AConnection will fail because port 3306 is blocked by AWS

BConnection will fail because outbound traffic is denied by default

CConnection will succeed because inbound rule allows it

DConnection will succeed only if outbound rule allows port 3306

Step-by-Step Solution

Solution:

Step 1: Understand default outbound behavior
By default, security groups allow all outbound traffic unless restricted.
Step 2: Analyze effect of no outbound rules
If no outbound rules exist, AWS allows all outbound traffic by default.
Final Answer:
Connection will succeed because inbound rule allows it -> Option C
Quick Check:
No outbound rules = allow outbound by default [OK]

Quick Trick: No outbound rules means outbound allowed by default [OK]

Common Mistakes:

MISTAKES

Assuming outbound is denied by default
Ignoring outbound rules impact
Thinking inbound alone controls connection

Master "Security Groups and Network ACLs" in AWS

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Time

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions

More AWS Quizzes

If a security group has an inbound rule allowing TCP port 3306 from 192.168.1.0/24 and no outbound rules, what will happen when an application tries to connect to a MySQL database on port 3306?

Step 1: Understand default outbound behavior

Step 2: Analyze effect of no outbound rules

Final Answer:

Quick Check:

Want More Practice?