Question 463 of 2,152

SNMP Troubleshooting →easyMultiple ChoiceObjective-mapped

Default SNMP Community String on Cisco IOS

This 300-410 practice question tests your understanding of snmp troubleshooting. 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.

What is the default SNMPv2c community string on most Cisco IOS devices?

A
public
Many Cisco devices come with a default 'public' community string for read-only access.
B
private
Why wrong: 'private' is not a default community string.
C
cisco
Why wrong: 'cisco' is not a default SNMP community string.
D
No default community string is configured.
Why wrong: While some devices may have no default, many do have 'public' configured.

Full breakdown with real-world context →

Quick Answer

The answer is public, but only in the specific context where a default SNMP community string has been preconfigured on a Cisco IOS device. Technically, the default state for SNMPv2c on most Cisco IOS devices is that no community string is configured at all; however, if one exists from a factory or minimal configuration, it is almost always set to 'public' with read-only access. On the Cisco CCNP ENARSI 300-410 exam, this question tests your understanding of SNMP security fundamentals and the common misconfiguration that leaves devices vulnerable. A frequent trap is assuming that 'private' is the default read-write string, but Cisco IOS does not ship with any default read-write community—only 'public' for read-only, and even that is not guaranteed unless explicitly set. To avoid confusion, remember the memory tip: "Public is for peeking, private is for poking, but Cisco ships with neither by default."

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

✓

public

The default SNMPv2c community string on most Cisco IOS devices is 'public' for read-only access. This is a well-known default that allows basic SNMP polling without additional configuration, as defined in Cisco's default configuration for SNMP agents.

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.

✓
public
Why this is correct
Many Cisco devices come with a default 'public' community string for read-only access.
Related concept
Read the scenario before looking for a memorised answer.
✗
private
Why it's wrong here
'private' is not a default community string.
✗
cisco
Why it's wrong here
'cisco' is not a default SNMP community string.
✗
No default community string is configured.
Why it's wrong here
While some devices may have no default, many do have 'public' configured.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the default SNMP community string to catch candidates who assume 'private' is the default for read-write or that no default exists, exploiting the common confusion between vendor defaults and best-practice security hardening.

Detailed technical explanation

How to think about this question

SNMPv2c uses community strings as a form of authentication, transmitted in plaintext. The 'public' community string is configured by default in the SNMP agent configuration (e.g., via `snmp-server community public RO`), and it is critical to change it in production to prevent unauthorized read access. Cisco's default behavior is documented in their SNMP configuration guides, and leaving 'public' enabled is a common security vulnerability.

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.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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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: public — The default SNMPv2c community string on most Cisco IOS devices is 'public' for read-only access. This is a well-known default that allows basic SNMP polling without additional configuration, as defined in Cisco's default configuration for SNMP agents.

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.

About these practice questions

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Same concept, more angles

1 more ways this is tested on 300-410

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. What is the default SNMP community string on a Cisco IOS device that has not been configured with any SNMP commands?

hard

A.public
B.private
C.cisco
✓ D.No default community string exists; SNMP is disabled.

Why D: By default, Cisco IOS devices have no SNMP community strings configured because SNMP is disabled until explicitly enabled with the 'snmp-server community' command. Without any SNMP configuration, the device does not respond to SNMP requests, making option D correct. This aligns with Cisco's security best practices to avoid exposing management access unintentionally.

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