- A
Modify the security group for the RDS instance to only allow traffic on port 443.
Why wrong: Port 443 is for HTTPS, not Oracle database connections (default 1521).
- B
Enable the rds.force_ssl parameter in the DB parameter group and configure the application to use SSL connections.
This enforces SSL at the database level, and the client can connect using SSL certificates.
- C
Use a default DB parameter group, as it already enforces SSL.
Why wrong: Default parameter groups do not enforce SSL.
- D
Set up a VPN connection between the two VPCs and route all traffic through it.
Why wrong: VPN encrypts traffic but adds overhead; simpler solutions exist.
Question 1,042 of 1,730
DBS-C01 Database Security Practice Question
This DBS-C01 practice question tests your understanding of database security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is migrating an on-premises Oracle database to Amazon RDS for Oracle. The security team requires that all network traffic between the application servers and the database be encrypted using TLS. The application servers are in a different VPC connected via VPC Peering. What is the simplest way to enforce encryption in transit?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable the rds.force_ssl parameter in the DB parameter group and configure the application to use SSL connections.
Option B is correct because enabling the rds.force_ssl parameter in the DB parameter group forces all connections to use SSL, satisfying the encryption-in-transit requirement. The application must be configured to connect using SSL with the appropriate certificate. Option A is wrong because changing the security group to port 443 does not enforce encryption; port 443 is for HTTPS, not for Oracle database traffic, and SSL is configured at the database level. Option C is wrong because the default parameter group does not enforce SSL; the rds.force_ssl parameter must be explicitly set. Option D is wrong because a VPN adds unnecessary complexity and does not directly enforce TLS encryption for database connections.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Modify the security group for the RDS instance to only allow traffic on port 443.
Why it's wrong here
Port 443 is for HTTPS, not Oracle database connections (default 1521).
- ✓
Enable the rds.force_ssl parameter in the DB parameter group and configure the application to use SSL connections.
Why this is correct
This enforces SSL at the database level, and the client can connect using SSL certificates.
Related concept
Standard ACLs match source addresses.
- ✗
Use a default DB parameter group, as it already enforces SSL.
Why it's wrong here
Default parameter groups do not enforce SSL.
- ✗
Set up a VPN connection between the two VPCs and route all traffic through it.
Why it's wrong here
VPN encrypts traffic but adds overhead; simpler solutions exist.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Database Security — This question tests Database Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Enable the rds.force_ssl parameter in the DB parameter group and configure the application to use SSL connections. — Option B is correct because enabling the rds.force_ssl parameter in the DB parameter group forces all connections to use SSL, satisfying the encryption-in-transit requirement. The application must be configured to connect using SSL with the appropriate certificate. Option A is wrong because changing the security group to port 443 does not enforce encryption; port 443 is for HTTPS, not for Oracle database traffic, and SSL is configured at the database level. Option C is wrong because the default parameter group does not enforce SSL; the rds.force_ssl parameter must be explicitly set. Option D is wrong because a VPN adds unnecessary complexity and does not directly enforce TLS encryption for database connections.
What should I do if I get this DBS-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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