200-901 Infrastructure and Automation Practice Question

Exhibit

Refer to the exhibit.

<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <rpc-error>
    <error-type>protocol</error-type>
    <error-tag>operation-failed</error-tag>
    <error-severity>error</error-severity>
    <error-message>
      Edit operation failed: the candidate configuration does not pass validation.
    </error-message>
    <error-info>
      <bad-element>mtu</bad-element>
      <bad-namespace>urn:cisco:params:xml:ns:yang:Cisco-IOS-XE-native</bad-namespace>
    </error-info>
  </rpc-error>
</rpc-reply>

A NETCONF RPC reply indicates a validation failure. Based on the exhibit, what is the most probable reason for the failure?

⚠ Common exam trap

Cisco often tests the distinction between validation errors (data model constraints) and other error types like syntax errors or namespace issues, leading candidates to confuse a validation failure with a malformed XML or unsupported namespace.

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 MTU value provided is outside the allowed range.

The NETCONF RPC reply indicates a validation failure, which typically occurs when the data being configured does not conform to the YANG model's constraints. In this context, the MTU value provided is outside the allowed range defined in the YANG model for the interface, triggering a validation error before any configuration is applied.

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 MTU value provided is outside the allowed range.
Why this is correct
Bad-element MTU indicates value issue.
✗
The XML syntax in the edit operation was malformed.
Why it's wrong here
Error says validation failed, not syntax.
✗
The XML namespace 'Cisco-IOS-XE-native' is not supported.
Why it's wrong here
Namespace is recognized as it's referenced.
✗
The NETCONF session timed out before the operation completed.
Why it's wrong here
Timeout would be different error.

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Last reviewed: Jun 24, 2026

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