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Deployment and Migration →easyMultiple ChoiceObjective-mapped

Quick Answer

The answer is MySQL, as the exhibit shows port 3306, which is the default database port for Amazon RDS MySQL and MariaDB engines. This is because AWS RDS assigns a standard TCP port to each supported database engine upon instance creation, and port 3306 is the well-known default for MySQL-based services, including Aurora MySQL when configured with RDS-style endpoints. On the AWS Certified Database Specialty DBS-C01 exam, this concept tests your ability to quickly identify an engine from connection metadata, often appearing in scenario-based questions where a developer provides a port number or endpoint snippet. A common trap is confusing port 3306 with PostgreSQL (5432) or Oracle (1521), especially when MariaDB is an option—remember that MariaDB shares MySQL’s default port. For a quick memory tip: think of MySQL’s “3306” as “three-three-zero-six, the MySQL fix”—it’s the only major RDS engine using that port, so when you see it, lock in MySQL or MariaDB.

DBS-C01 Deployment and Migration Practice Question

This DBS-C01 practice question tests your understanding of deployment and migration. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.

Network Topology
aws rds describe-db-instancesdb-instance-identifier mydbquery 'DBInstances[0].[Endpoint.AddressRefer to the exhibit.```Output:"mydb.123456789012.us-east-1.rds.amazonaws.com",3306,"available"

Refer to the exhibit. A developer wants to connect to the database. Which database engine is most likely being used?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

  • Clue: "most likely"

    Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1easymultiple choice
Full question →
Network Topology
aws rds describe-db-instancesdb-instance-identifier mydbquery 'DBInstances[0].[Endpoint.AddressRefer to the exhibit.```Output:"mydb.123456789012.us-east-1.rds.amazonaws.com",3306,"available"

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

✓

MySQL

The output shows port 3306, which is the default port for MySQL and MariaDB. Amazon RDS for MySQL uses port 3306. Aurora MySQL also uses 3306, but the endpoint pattern is RDS, not Aurora-specific. PostgreSQL uses 5432, Oracle uses 1521, SQL Server uses 1433.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    Oracle

    Why it's wrong here

    Oracle uses port 1521.

  • ✗

    SQL Server

    Why it's wrong here

    SQL Server uses port 1433.

  • ✓

    MySQL

    Why this is correct

    Port 3306 is default for MySQL.

    Clue confirmation

    The clue word "most likely" in the question point toward this answer.

    Related concept

    Static NAT maps one inside address to one outside address.

  • ✗

    PostgreSQL

    Why it's wrong here

    PostgreSQL uses port 5432.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

  • Static NAT maps one inside address to one outside address.
  • PAT allows many inside hosts to share one public address using ports.
  • Inside local and inside global describe the private and translated addresses.
  • NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

  • Identify inside and outside interfaces first.
  • Check whether the scenario needs static NAT, dynamic NAT or PAT.
  • Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Real-world example

How this comes up in practice

A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this DBS-C01 question test?

Deployment and Migration — This question tests Deployment and Migration — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: MySQL — The output shows port 3306, which is the default port for MySQL and MariaDB. Amazon RDS for MySQL uses port 3306. Aurora MySQL also uses 3306, but the endpoint pattern is RDS, not Aurora-specific. PostgreSQL uses 5432, Oracle uses 1521, SQL Server uses 1433.

What should I do if I get this DBS-C01 question wrong?

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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Same concept, more angles

1 more ways this is tested on DBS-C01

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. Match each database engine to its default port number.

medium

    Why : Default ports for common relational database engines.

    Last reviewed: Jun 20, 2026

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    This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.