- A
SNMPv1
Why wrong: SNMPv1 uses community strings and no security.
- B
SNMPv2c
Why wrong: SNMPv2c also uses community strings and no security.
- C
SNMPv3
SNMPv3 introduced USM and VACM for security and access control.
- D
SNMPv2u
Why wrong: SNMPv2u was an experimental version, not widely adopted.
Question 339 of 2,152
SNMPv3: Introduction of USM and VACM
This 300-410 practice question tests your understanding of snmp troubleshooting. 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 SNMP version introduced the use of a User-based Security Model (USM) and View-based Access Control Model (VACM)?
Quick Answer
The answer is SNMPv3. This version introduced the User-based Security Model (USM) and View-based Access Control Model (VACM) to address the critical security gaps in SNMPv1 and v2c, which rely only on plaintext community strings. USM provides authentication and encryption to ensure data integrity and confidentiality, while VACM enables granular control over which MIB objects a user can read or write. On the Cisco CCNP ENARSI 300-410 exam, this concept often appears in questions about SNMP configuration or security features, with a common trap being that SNMPv2c also supports some security enhancements—but it does not include USM or VACM. A quick memory tip: think of “3” as the “three pillars” of security—authentication, encryption, and access control—all absent in earlier versions.
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
✓
SNMPv3
SNMPv3 introduced the User-based Security Model (USM) for authentication and encryption, and the View-based Access Control Model (VACM) for granular access control. These models provide message integrity, authentication, and encryption, addressing the security deficiencies of earlier SNMP versions.
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.
- ✗
SNMPv1
Why it's wrong here
SNMPv1 uses community strings and no security.
- ✗
SNMPv2c
Why it's wrong here
SNMPv2c also uses community strings and no security.
- ✓
SNMPv3
Why this is correct
SNMPv3 introduced USM and VACM for security and access control.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
SNMPv2u
Why it's wrong here
SNMPv2u was an experimental version, not widely adopted.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between SNMPv2u (which introduced user-based security but not VACM) and SNMPv3 (which combined USM and VACM), leading candidates to mistakenly select SNMPv2u as the version that introduced both models.
Detailed technical explanation
How to think about this question
USM (RFC 3414) provides authentication via HMAC-MD5-96 or HMAC-SHA-96 and encryption via CBC-DES, while VACM (RFC 3415) defines access policies based on groups, views, and security levels. In practice, SNMPv3's security models allow network engineers to configure read-only or read-write views for specific MIB subtrees, preventing unauthorized configuration changes even if credentials are compromised.
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 practitioner preparing for the 300-410 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.
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
What to study next
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FAQ
Questions learners often ask
What does this 300-410 question test?
SNMP Troubleshooting — This question tests SNMP Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: SNMPv3 — SNMPv3 introduced the User-based Security Model (USM) for authentication and encryption, and the View-based Access Control Model (VACM) for granular access control. These models provide message integrity, authentication, and encryption, addressing the security deficiencies of earlier SNMP versions.
What should I do if I get this 300-410 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
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