Quick Answer
The answer is confidentiality. AES-256 encryption ensures data confidentiality by transforming plaintext into ciphertext using a 256-bit symmetric key, making the data unreadable to anyone who lacks the correct decryption key. This directly protects sensitive data at rest, so even if an attacker physically steals the storage medium, the encrypted content remains inaccessible. On the Cisco CyberOps Associate 200-201 exam, this concept tests your understanding of the CIA triad’s confidentiality pillar, often appearing in scenario-based questions where encryption is used to prevent unauthorized disclosure. A common trap is confusing confidentiality with integrity—remember that encryption does not prevent data from being altered, only from being read. For a quick memory tip, think “AES-256 locks the data; only the key unlocks the secret.”
This 200-201 practice question tests your understanding of security concepts. 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.
To protect sensitive data at rest, a company uses AES-256 encryption. This primarily ensures which security goal?
Confidentiality
Encryption protects data from unauthorized disclosure.
Availability
Why wrong: Availability ensures data is accessible when needed; encryption doesn't guarantee that.
Integrity
Why wrong: Integrity is about preventing unauthorized modification, not encryption.
Non-repudiation
Why wrong: Non-repudiation prevents denial of actions, typically via digital signatures.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Confidentiality
AES-256 encryption transforms plaintext data into ciphertext using a 256-bit symmetric key, rendering it unreadable without the correct decryption key. This directly ensures confidentiality by preventing unauthorized access to the stored data, even if the storage medium is compromised.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Confidentiality
Why this is correct
Encryption protects data from unauthorized disclosure.
Related concept
Read the scenario before looking for a memorised answer.
Availability
Why it's wrong here
Availability ensures data is accessible when needed; encryption doesn't guarantee that.
Integrity
Why it's wrong here
Integrity is about preventing unauthorized modification, not encryption.
Non-repudiation
Why it's wrong here
Non-repudiation prevents denial of actions, typically via digital signatures.
Common exam traps
Cisco often tests the distinction between encryption (confidentiality) and hashing (integrity), so the trap here is confusing AES-256's role in protecting data from unauthorized reading with the ability to detect tampering, which would require a separate integrity mechanism.
Detailed technical explanation
AES-256 operates on 128-bit blocks using a 14-round Feistel-like structure with substitution-permutation network (SPN) design, where each round applies SubBytes, ShiftRows, MixColumns, and AddRoundKey operations. In real-world scenarios, AES-256 encryption at rest is often combined with key management systems (e.g., AWS KMS or Azure Key Vault) and integrity checks (e.g., GCM mode) to also provide authentication, but the primary goal remains confidentiality.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 200-201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Security Concepts — This question tests Security Concepts — Read the scenario before looking for a memorised answer..
The correct answer is: Confidentiality — AES-256 encryption transforms plaintext data into ciphertext using a 256-bit symmetric key, rendering it unreadable without the correct decryption key. This directly ensures confidentiality by preventing unauthorized access to the stored data, even if the storage medium is compromised.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This 200-201 practice question is part of Courseiva's free Cisco 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 200-201 exam.
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