← DOP-C02·Amazon Web Services

Question 236 of 1,750

Resilient Cloud Solutions →easyMultiple ChoiceObjective-mapped

Minimizing RDS Failover Downtime with RDS Proxy

This DOP-C02 practice question tests your understanding of resilient cloud solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 using Amazon RDS for MySQL with Multi-AZ deployment. During a recent failover, the application experienced a brief downtime because the DNS cache on the application servers still pointed to the old primary. How can a DevOps engineer minimize this downtime?

Clue words in this question

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

Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

A
Use an RDS Proxy to manage connections and reduce DNS dependency.
RDS Proxy provides a stable endpoint and handles failover transparently.
B
Configure the application to use the Multi-AZ endpoint instead of the primary endpoint.
Why wrong: There is no separate Multi-AZ endpoint; the same CNAME is used.
C
Configure application servers to use a hardcoded IP address instead of the RDS endpoint.
Why wrong: Hardcoded IPs break on failover.
D
Increase the TTL on the RDS DNS record.
Why wrong: Higher TTL means longer cache, increasing downtime.

Full breakdown with real-world context →

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

✓

Use an RDS Proxy to manage connections and reduce DNS dependency.

RDS Proxy acts as a connection broker that maintains persistent connections to the database and abstracts the underlying DNS changes during failover. When a failover occurs, RDS Proxy automatically reconnects to the new primary without requiring the application to resolve a new DNS record, thereby eliminating the downtime caused by stale DNS caches. This reduces the application's dependency on DNS resolution and provides faster failover recovery.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

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

✓
Use an RDS Proxy to manage connections and reduce DNS dependency.
Why this is correct
RDS Proxy provides a stable endpoint and handles failover transparently.
Clue confirmation
The clue words "primary", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure the application to use the Multi-AZ endpoint instead of the primary endpoint.
Why it's wrong here
There is no separate Multi-AZ endpoint; the same CNAME is used.
✗
Configure application servers to use a hardcoded IP address instead of the RDS endpoint.
Why it's wrong here
Hardcoded IPs break on failover.
✗
Increase the TTL on the RDS DNS record.
Why it's wrong here
Higher TTL means longer cache, increasing downtime.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often think increasing TTL or using a different endpoint will help, but the real issue is DNS cache staleness, which RDS Proxy bypasses entirely by managing connections at the proxy layer.

Detailed technical explanation

How to think about this question

RDS Proxy uses a connection pool that keeps database connections open and multiplexes them across application requests, so when a failover occurs, the proxy transparently reconnects to the new primary without dropping existing connections. The proxy's endpoint remains constant, and it handles the DNS resolution internally, which means application servers never need to re-resolve the RDS endpoint. In contrast, without RDS Proxy, the application's DNS cache (which typically has a TTL of 5–60 seconds) must expire before the new primary's IP is used, causing a brief outage.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

Visual reference

Quick reference

Common DNS Record Types

Record	Purpose	Example
A	IPv4 address mapping	example.com → 93.184.216.34
AAAA	IPv6 address mapping	example.com → 2606:2800::1
CNAME	Alias to another hostname	www → example.com
MX	Mail server for domain	example.com → mail.example.com (priority 10)
TXT	Text data (SPF, DKIM, verification)	v=spf1 include:_spf.example.com ~all
NS	Authoritative name servers	example.com NS ns1.example.com
PTR	Reverse DNS (IP → hostname)	34.216.184.93.in-addr.arpa → example.com
SOA	Zone authority record	Primary NS, admin email, serial, TTL defaults

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Use an RDS Proxy to manage connections and reduce DNS dependency. — RDS Proxy acts as a connection broker that maintains persistent connections to the database and abstracts the underlying DNS changes during failover. When a failover occurs, RDS Proxy automatically reconnects to the new primary without requiring the application to resolve a new DNS record, thereby eliminating the downtime caused by stale DNS caches. This reduces the application's dependency on DNS resolution and provides faster failover recovery.

What should I do if I get this DOP-C02 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "primary", "minimum / minimize". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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This DOP-C02 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 DOP-C02 exam.