300-420 Question #146: Real Exam Question with Answer & Explanation

Question

A company must automate a set of complex changes aligned with DR testing in the network. These changes are specific, and the DR playbook will be adjusted in the future. The playbook has diverse routing and switching assets in scope as well as multiple vendor and hardware platforms. A developer will create a thin, web front-end microservice and integrate with an Open daylight controller to push changes to the network. Which YANG model should be used?

Options

• AUse a single native vendor YANG model to minimize development time
• BUse an open YANG model to allow the reuse of code and standardize the implementation across
• CUse multiple native vendor YANG models to provide code consistency.
• DDevelop an individualized YANG model to minimize development resources and time to market.

Explanation

For automating network changes across diverse, multi-vendor platforms with future adaptability, using an open YANG model is the most effective approach.

Common mistakes.

• A. A single native vendor YANG model would not be applicable across multiple vendor and hardware platforms, leading to vendor lock-in and significant integration challenges.
• C. Using multiple native vendor YANG models would significantly increase complexity, requiring separate code for each vendor and making consistent management and future adjustments very difficult.
• D. Developing an individualized (custom) YANG model would require extensive development resources and time for creation, maintenance, and adaptation across different vendors, which contradicts the goal of minimizing resources and time to market.

Concept tested. YANG model selection for multi-vendor network automation

Reference. https://www.cisco.com/c/en/us/products/cloud-systems-management/network-automation/yang.html

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