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Infrastructure and AutomationhardMultiple ChoiceObjective-mapped

200-901 Infrastructure and Automation Practice Question

A developer is creating a YANG data model for a new interface feature. The model must allow the user to choose from a predefined set of values for the 'duplex' leaf. Which YANG statement should be used to restrict the values to 'full', 'half', and 'auto'?

⚠ Common exam trap

Cisco often tests the distinction between YANG's 'choice' statement (which selects among different schema branches) and the 'enumeration' type (which restricts a single leaf's value), leading candidates to mistakenly choose 'choice' when they need a value restriction.

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

type enumeration { enum full; enum half; enum auto; }

The 'type enumeration' statement in YANG defines a leaf that can only take one of the explicitly listed enum values. By specifying 'enum full;', 'enum half;', and 'enum auto;', the developer restricts the 'duplex' leaf to exactly those three predefined strings, which matches the requirement.

Answer analysis

Option-by-option breakdown

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

  • choice duplex-options { case full; case half; case auto; }

    Why it's wrong here

    Choice is for selecting between child nodes, not for leaf values.

  • type string;

    Why it's wrong here

    String allows any value.

  • type leafref { path '/other:duplex-list'; }

    Why it's wrong here

    Leafref references an existing leaf.

  • type enumeration { enum full; enum half; enum auto; }

    Why this is correct

    Enumeration restricts to listed values.

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Last reviewed: Jun 24, 2026

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