- A
Amazon EBS (Elastic Block Store)
Why wrong: EBS provides persistent block storage but is network-attached, which adds some latency compared to physically attached NVMe instance store SSDs.
- B
Amazon EFS (Elastic File System)
Why wrong: EFS is a network file system with higher latency than local storage — used for shared access, not lowest-latency single-instance storage.
- C
EC2 Instance Store
Instance store provides physically attached NVMe SSDs with the lowest possible latency for EC2 storage — ideal for temporary data like buffers, caches, and scratch data. Data is lost when the instance stops.
- D
Amazon S3
Why wrong: S3 is object storage accessed via HTTP — it has significantly higher latency than local block storage and requires API calls to access data.
Quick Answer
The answer is EC2 Instance Store. This storage type achieves the lowest latency for a single EC2 instance because the NVMe SSDs are physically attached to the host computer, eliminating the network hop required by services like EBS or EFS. For the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your understanding of the trade-off between performance and durability: Instance Store offers blazing speed but is ephemeral—data is lost if the instance stops or fails. A common trap is confusing it with EBS, which is network-attached and thus has higher latency, or assuming "lowest latency" means a managed service like EBS io2. Remember, direct attachment beats network storage every time for raw speed. A helpful memory tip: think "Instance Store = Instant Speed, but Temporary." If the exam asks for the fastest, non-persistent option for a single EC2 instance, Instance Store is your answer.
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which AWS storage type provides the lowest latency storage for a single EC2 instance, with data stored on NVMe SSDs physically attached to the host computer?
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
EC2 Instance Store
EC2 Instance Store provides temporary block-level storage for an EC2 instance, with data stored on NVMe SSDs that are physically attached to the host computer. This direct attachment eliminates network latency, offering the lowest possible latency for a single EC2 instance compared to any network-attached storage option.
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.
- ✗
Amazon EBS (Elastic Block Store)
Why it's wrong here
EBS provides persistent block storage but is network-attached, which adds some latency compared to physically attached NVMe instance store SSDs.
- ✗
Amazon EFS (Elastic File System)
Why it's wrong here
EFS is a network file system with higher latency than local storage — used for shared access, not lowest-latency single-instance storage.
- ✓
EC2 Instance Store
Why this is correct
Instance store provides physically attached NVMe SSDs with the lowest possible latency for EC2 storage — ideal for temporary data like buffers, caches, and scratch data. Data is lost when the instance stops.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon S3
Why it's wrong here
S3 is object storage accessed via HTTP — it has significantly higher latency than local block storage and requires API calls to access data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Amazon EBS with local storage, but EBS is network-attached and cannot match the latency of physically attached NVMe SSDs, which is the key differentiator for this question.
Detailed technical explanation
How to think about this question
Instance Store volumes are ephemeral—data persists only during the life of the instance; if the instance stops, terminates, or fails, all data is lost. The NVMe interface provides direct PCIe attachment, achieving sub-millisecond latency and high IOPS without the overhead of network protocols like iSCSI or NFS. This makes Instance Store ideal for temporary data like caches, scratch data, or buffers, but unsuitable for persistent or critical data requiring durability.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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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Cloud Technology and Services — study guide chapter
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Technology and Services — This question tests Cloud Technology and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: EC2 Instance Store — EC2 Instance Store provides temporary block-level storage for an EC2 instance, with data stored on NVMe SSDs that are physically attached to the host computer. This direct attachment eliminates network latency, offering the lowest possible latency for a single EC2 instance compared to any network-attached storage option.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
This CLF-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 CLF-C02 exam.
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