- A
Non-repudiation
Why wrong: Non-repudiation is related to cryptography, not a core CIA element.
- B
Integrity
Why wrong: Integrity ensures data is not altered or tampered with.
- C
Confidentiality
Confidentiality prevents unauthorized disclosure of information.
- D
Availability
Why wrong: Availability focuses on ensuring systems are accessible when needed.
Question 717 of 1,000
200-201 Security Concepts Practice Question
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.
Which element of the CIA triad is primarily concerned with preventing unauthorized access to data?
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
✓
Confidentiality
Confidentiality is the CIA triad element that ensures data is accessible only to authorized users. It is primarily enforced through encryption (e.g., AES-256 for data at rest, TLS 1.3 for data in transit) and access control mechanisms (e.g., RBAC, ACLs). Preventing unauthorized access directly aligns with confidentiality's goal of protecting data from disclosure.
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.
- ✗
Non-repudiation
Why it's wrong here
Non-repudiation is related to cryptography, not a core CIA element.
- ✗
Integrity
Why it's wrong here
Integrity ensures data is not altered or tampered with.
- ✓
Confidentiality
Why this is correct
Confidentiality prevents unauthorized disclosure of information.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Availability
Why it's wrong here
Availability focuses on ensuring systems are accessible when needed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between confidentiality and integrity, where candidates mistakenly choose integrity because they conflate 'preventing changes' with 'preventing access'.
Detailed technical explanation
How to think about this question
Under the hood, confidentiality is often implemented using symmetric encryption (e.g., AES) for bulk data and asymmetric encryption (e.g., RSA, ECC) for key exchange. In network security, protocols like IPsec (ESP in tunnel mode) or SSH provide confidentiality at different OSI layers. A real-world scenario: a database breach where encrypted columns (e.g., using TDE) remain unreadable to attackers, preserving confidentiality even if access controls fail.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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.
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FAQ
Questions learners often ask
What does this 200-201 question test?
Security Concepts — This question tests Security Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Confidentiality — Confidentiality is the CIA triad element that ensures data is accessible only to authorized users. It is primarily enforced through encryption (e.g., AES-256 for data at rest, TLS 1.3 for data in transit) and access control mechanisms (e.g., RBAC, ACLs). Preventing unauthorized access directly aligns with confidentiality's goal of protecting data from disclosure.
What should I do if I get this 200-201 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: Jul 4, 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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