- A
Asymmetric encryption
Why wrong: Asymmetric is slower and inefficient for large data.
- B
Public Key Infrastructure (PKI)
Why wrong: PKI is a framework, not an encryption method.
- C
Symmetric encryption
Symmetric encryption is fast and suitable for bulk data.
- D
Hash function
Why wrong: Hash functions provide integrity, not confidentiality.
Question 508 of 1,000
easyMultiple ChoiceObjective-mapped
SSCP Practice Question: Encrypt large volumes of data at rest on a file…
This SSCP practice question tests your understanding of sscp exam topics. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 needs to encrypt large volumes of data at rest on a file server. Which type of cryptography is most appropriate for this task?
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
✓
Symmetric encryption
Symmetric encryption uses a single shared key for both encryption and decryption, making it significantly faster and more efficient than asymmetric encryption for bulk data encryption. For large volumes of data at rest on a file server, symmetric algorithms like AES-256 provide the necessary performance and security, as they are designed to handle high-throughput encryption with minimal computational overhead.
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.
- ✗
Asymmetric encryption
Why it's wrong here
Asymmetric is slower and inefficient for large data.
- ✗
Public Key Infrastructure (PKI)
Why it's wrong here
PKI is a framework, not an encryption method.
- ✓
Symmetric encryption
Why this is correct
Symmetric encryption is fast and suitable for bulk data.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Hash function
Why it's wrong here
Hash functions provide integrity, not confidentiality.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the role of asymmetric encryption (used for key exchange or small data) with bulk encryption, or mistakenly think PKI is an encryption method rather than a management framework, leading them to choose options that are technically valid in other contexts but inappropriate for large-scale data-at-rest encryption.
Detailed technical explanation
How to think about this question
Symmetric encryption, such as AES in XTS or CBC mode, is optimized for block-level storage encryption, often leveraging hardware acceleration (e.g., AES-NI instructions in modern CPUs) to achieve high throughput. In practice, file server encryption solutions like BitLocker or LUKS use symmetric keys, with the symmetric key itself often wrapped using asymmetric encryption for secure key management, but the bulk data encryption remains symmetric. A real-world scenario is encrypting a 10 TB NAS volume where AES-256-GCM provides both confidentiality and integrity, while RSA would introduce unacceptable latency and overhead.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
Quick reference
Symmetric Encryption Algorithm Comparison
| Algorithm | Key Size | Block Size | Status | Notes |
|---|---|---|---|---|
| AES-128 | 128-bit | 128-bit | Current standard | NIST approved; WPA3, TLS |
| AES-256 | 256-bit | 128-bit | Current standard | Preferred for sensitive / govt data |
| 3DES | 112-bit effective | 64-bit | Deprecated (2023) | Replaced by AES |
| DES | 56-bit | 64-bit | Broken | Cracked in < 24 h; never deploy |
| ChaCha20 | 256-bit | Stream cipher | Current | TLS 1.3, WireGuard |
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 SSCP question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Symmetric encryption — Symmetric encryption uses a single shared key for both encryption and decryption, making it significantly faster and more efficient than asymmetric encryption for bulk data encryption. For large volumes of data at rest on a file server, symmetric algorithms like AES-256 provide the necessary performance and security, as they are designed to handle high-throughput encryption with minimal computational overhead.
What should I do if I get this SSCP 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.
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Last reviewed: Jun 25, 2026
This SSCP practice question is part of Courseiva's free ISC2 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 SSCP exam.
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