350-401 Question #1335: Real Exam Question with Answer & Explanation

Question

What are a benefit of YANG?

Options

• AIt enforces the use of a specific encoding format for NETCONF.
• BIt collects statistical constraint analysis information.
• CIt enables multiple leaf statements to exist within a leaf list.
• DIt enforces configuration constraints.

Explanation

YANG and Configuration Constraints

YANG (Yet Another Next Generation) is a data modeling language used with NETCONF and RESTCONF that enforces configuration constraints, ensuring that only valid, consistent configurations can be applied to network devices - for example, requiring that a value falls within a specific range or that dependent fields are populated correctly.

Why the distractors are wrong:

• Option A is incorrect because YANG is encoding-agnostic; it works with multiple formats (XML, JSON), and does not enforce a single encoding format for NETCONF.
• Option B is a fabricated benefit - YANG does not perform "statistical constraint analysis," which is not a real YANG function.
• Option C is incorrect because a leaf-list in YANG allows multiple instances of a single leaf type, but it does not mean multiple different leaf statements exist within it - this misrepresents how leaf-list works.

Memory Tip: Think of YANG as a rulebook for your network configuration - just like a bouncer enforces rules at a door, YANG enforces what data is valid before it enters the device. If your config breaks a rule, YANG rejects it. "YANG = Your Accurate Network Guardian."

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