350-401 Question #587: Real Exam Question with Answer & Explanation

Question

Why would an engineer use YANG?

Options

• Ato transport data between a controller and a network device
• Bto access data using SNMP
• Cto model data for NETCONF
• Dto translate JSON into an equivalent XML syntax

Explanation

YANG and NETCONF Explained

YANG (Yet Another Next Generation) is a data modeling language specifically designed to define the structure, syntax, and semantics of data used by NETCONF (Network Configuration Protocol), making option C correct. YANG models tell NETCONF exactly what data a network device can expose or accept, essentially serving as the "blueprint" for configuration and operational data.

• Option A is wrong because data transport between a controller and network device is the job of protocols like NETCONF or RESTCONF, not YANG itself.
• Option B is wrong because SNMP (Simple Network Management Protocol) is an older, separate management framework that does not use YANG; YANG is associated with NETCONF/RESTCONF.
• Option D is wrong because YANG is not a translation tool between JSON and XML; it's a modeling language, though YANG-defined data can be encoded in either format.

🧠 Memory Tip: Think of YANG as the architect's blueprint and NETCONF as the construction crew - the crew (NETCONF) needs the blueprint (YANG) to know what to build. "YANG Models, NETCONF Moves."

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