- A
Community string
Why wrong: Community strings are used in SNMPv1/v2c, not in SNMPv3. SNMPv3 uses a username and password for authentication.
- B
Username and password
SNMPv3 authentication requires a username and an authentication password (or passphrase) that is used to generate a hash, verifying the source of the message.
- C
Encryption key
Why wrong: An encryption key is used for SNMPv3 privacy (encryption of the payload), not for authentication. Authentication is separate.
- D
Public key
Why wrong: SNMPv3 does not use public-key cryptography for authentication. It uses symmetric hashing with a shared secret.
Question 266 of 520
SNMPv3 Authentication Requires Username and Password
This N10-009 practice question tests your understanding of network operations. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 network administrator is setting up SNMPv3 on a router for secure monitoring. Which of the following is required for SNMPv3 authentication?
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
✓
Username and password
SNMPv3 introduces a security model that requires a username and password (authentication passphrase) for authentication, moving away from the community-string-based model of SNMPv1/v2c. The password is used with an authentication protocol like MD5 or SHA to verify the identity of the manager before allowing access. Without a valid username and password combination, SNMPv3 will reject the request.
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.
- ✗
Community string
Why it's wrong here
Community strings are used in SNMPv1/v2c, not in SNMPv3. SNMPv3 uses a username and password for authentication.
When this WOULD be correct
In a question about configuring SNMPv2c for read-only access on a legacy device, the community string would be the correct authentication method.
- ✓
Username and password
Why this is correct
SNMPv3 authentication requires a username and an authentication password (or passphrase) that is used to generate a hash, verifying the source of the message.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Encryption key
Why it's wrong here
An encryption key is used for SNMPv3 privacy (encryption of the payload), not for authentication. Authentication is separate.
When this WOULD be correct
A question asking 'Which of the following is required for SNMPv3 privacy?' would make encryption key the correct answer, as privacy ensures data encryption using a separate key.
- ✗
Public key
Why it's wrong here
SNMPv3 does not use public-key cryptography for authentication. It uses symmetric hashing with a shared secret.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The N10-009 exam frequently reuses these exact scenarios with slightly different constraints.
✓Username and passwordCorrect answer▾
Why this is correct
SNMPv3 authentication requires a username and an authentication password (or passphrase) that is used to generate a hash, verifying the source of the message.
✗Community stringWrong answer — click to see why▾
Why this is wrong here
SNMPv3 uses a username and password for authentication, not a community string. Community strings are used in SNMPv1 and v2c, which lack security.
★ When this WOULD be the correct answer
In a question about configuring SNMPv2c for read-only access on a legacy device, the community string would be the correct authentication method.
Why candidates choose this
Candidates often confuse SNMPv3 with earlier versions, mistakenly thinking community strings are still used for authentication in v3.
✗Encryption keyWrong answer — click to see why▾
Why this is wrong here
SNMPv3 authentication uses a username and password (or passphrase), not an encryption key. Encryption keys are used for SNMPv3 privacy (encryption), not authentication.
★ When this WOULD be the correct answer
A question asking 'Which of the following is required for SNMPv3 privacy?' would make encryption key the correct answer, as privacy ensures data encryption using a separate key.
Why candidates choose this
Candidates may confuse authentication with encryption, thinking that a key is needed for both, or they may associate 'security' with encryption keys rather than authentication credentials.
✗Public keyWrong answer — click to see why▾
Why this is wrong here
SNMPv3 authentication uses a username and password (or passphrase) via HMAC-MD5 or HMAC-SHA, not a public key. Public keys are used in asymmetric cryptography, which is not part of SNMPv3's authentication mechanism.
★ When this WOULD be the correct answer
A question about configuring SSH or TLS for secure device management, where public key authentication is required (e.g., 'Which of the following is needed for SSH key-based authentication?').
Why candidates choose this
Candidates may confuse SNMPv3's security features with other secure protocols that use public key cryptography, or assume that 'secure' always implies asymmetric encryption.
Analysis generated from the official N10-009blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the community string (SNMPv1/v2c) with SNMPv3's username/password model, or they mistakenly think an encryption key alone satisfies authentication requirements, when in fact authentication and privacy are configured independently.
Detailed technical explanation
How to think about this question
SNMPv3 authentication uses the User-Based Security Model (USM), where the router stores a username and an authentication passphrase. The passphrase is hashed using HMAC-MD5-96 or HMAC-SHA-96 to generate a message digest that is appended to each SNMP packet, ensuring the packet's origin and integrity. In a real-world deployment, you must configure both the authentication protocol (e.g., `auth sha`) and the privacy protocol (e.g., `priv aes 128`) separately, as they serve distinct security functions.
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 N10-009 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
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this N10-009 question test?
Network Operations — This question tests Network Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Username and password — SNMPv3 introduces a security model that requires a username and password (authentication passphrase) for authentication, moving away from the community-string-based model of SNMPv1/v2c. The password is used with an authentication protocol like MD5 or SHA to verify the identity of the manager before allowing access. Without a valid username and password combination, SNMPv3 will reject the request.
What should I do if I get this N10-009 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 11, 2026
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