Question 1,088 of 2,152

SNMP Troubleshooting →easyMultiple ChoiceObjective-mapped

Quick Answer

The answer is that using the same community string for both RO and RW causes the router to apply the read-only privilege first, blocking write operations. This occurs because Cisco IOS processes community strings in the order they are configured; when 'snmp-server community cisco RO' is entered before 'snmp-server community cisco RW', the router binds the string 'cisco' exclusively to read-only access, ignoring the subsequent RW assignment. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of SNMPv2c community string precedence and the common misconfiguration where an engineer assumes identical strings grant both privileges. The trap is that the NMS can poll successfully, leading you to suspect ACLs or version mismatches, but the root cause is the duplicate string. A simple memory tip: "First match locks the privilege—RO before RW means no write."

300-410 SNMP Troubleshooting Practice Question

This 300-410 practice question tests your understanding of snmp troubleshooting. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 engineer configures SNMPv2c on router R3 with 'snmp-server community cisco RO' and 'snmp-server community cisco RW'. The NMS can poll read-only data but fails when trying to write a configuration value. The NMS uses the RW community string. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1easymultiple choice

Read the full network assurance explanation →

A
The community string 'cisco' is used for both RO and RW; the router applies the first matching community, which is RO.
Correct because identical community strings cause the router to use the RO access, preventing writes.
B
The NMS is sending the community string in uppercase, but the router expects lowercase.
Why wrong: Incorrect because community strings are case-sensitive, but the NMS would fail for both RO and RW if case mismatched.
C
The router needs the 'snmp-server enable traps' command to allow write operations.
Why wrong: Incorrect because enabling traps is unrelated to write access.
D
The NMS must use SNMPv3 for write operations; SNMPv2c does not support writes.
Why wrong: Incorrect because SNMPv2c supports write operations with the RW community.

Full breakdown with real-world context →

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

✓

The community string 'cisco' is used for both RO and RW; the router applies the first matching community, which is RO.

The RW community string is 'cisco', but the RO community string is also 'cisco'. When both are identical, the router treats the community as read-only, ignoring the RW privilege. The engineer must use different community strings for RO and RW.

Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
The community string 'cisco' is used for both RO and RW; the router applies the first matching community, which is RO.
Why this is correct
Correct because identical community strings cause the router to use the RO access, preventing writes.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Authentication checks who the user is.
✗
The NMS is sending the community string in uppercase, but the router expects lowercase.
Why it's wrong here
Incorrect because community strings are case-sensitive, but the NMS would fail for both RO and RW if case mismatched.
✗
The router needs the 'snmp-server enable traps' command to allow write operations.
Why it's wrong here
Incorrect because enabling traps is unrelated to write access.
✗
The NMS must use SNMPv3 for write operations; SNMPv2c does not support writes.
Why it's wrong here
Incorrect because SNMPv2c supports write operations with the RW community.

Common exam traps

Common exam trap: authentication is not authorization

Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.

Detailed technical explanation

How to think about this question

This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.

KKey Concepts to Remember

Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.

TExam Day Tips

Do not assume successful login means full administrative access.
Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
Separate login problems from permission problems before choosing the answer.

Key takeaway

Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.

Real-world example

How this comes up in practice

A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.

What to study next

Got this wrong? Here's your next step.

Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 300-410 questions on access control and AAA configuration.

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FAQ

Questions learners often ask

What does this 300-410 question test?

SNMP Troubleshooting — This question tests SNMP Troubleshooting — Authentication checks who the user is..

What is the correct answer to this question?

The correct answer is: The community string 'cisco' is used for both RO and RW; the router applies the first matching community, which is RO. — The RW community string is 'cisco', but the RO community string is also 'cisco'. When both are identical, the router treats the community as read-only, ignoring the RW privilege. The engineer must use different community strings for RO and RW.

What should I do if I get this 300-410 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Authentication checks who the user is.

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