6.3 Describe the High-Level Principles and Benefits of a Data Modeling Language, Such as YANG 350-401 Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A network operations team is evaluating ways to reduce configuration errors caused by manual CLI entry. They want a solution that provides a structured, machine-readable format for configuration data and allows programmatic validation before changes are applied. Which approach aligns with these goals?

   • AAdopt YANG data models and use NETCONF/RESTCONF for configuration management.
   • BContinue using CLI but add a peer-review process for all changes.
   • CUse TFTP to push configuration files to devices.
   • DUse SNMP to monitor and configure devices.
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2. 12application · medium

   A network engineer is reviewing a YANG module that defines the configuration of a router interface. The module uses a container named 'ethernet' that contains a leaf named 'speed' and a leaf-list named 'ip-address'. Which statement accurately describes this YANG structure?

   • AThe 'ethernet' container can be repeated multiple times, each with its own 'speed' and 'ip-address' values.
   • BThe 'speed' leaf is a single value, and the 'ip-address' leaf-list can contain multiple IP addresses.
   • CThe 'ip-address' leaf-list is a single value that can be a string of multiple IP addresses separated by commas.
   • DThe 'ethernet' container can have multiple 'speed' leaves, and the 'ip-address' leaf-list can have only one value.
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4. 13expert · hard

   A large enterprise is migrating from a legacy CLI-based configuration management system to a YANG-based automation platform. The network has devices from three vendors, and each vendor has its own YANG models for interface configuration. The team wants to write a single automation script that can configure interface MTU on all devices. The script must be maintainable and not require per-vendor logic. Which approach best meets these requirements?

   • AUse a standard YANG model like 'ietf-interfaces' and map vendor-specific deviations to it.
   • BWrite separate scripts for each vendor, each using the vendor's native YANG model.
   • CUse the vendor-specific models but write a translation layer in the script to convert between them.
   • DUse NETCONF with the vendor-specific models and rely on the device to handle the differences.
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5. 14application · medium

   A network engineer is examining a YANG module that models a router's routing table. The module defines a structure that contains multiple route entries, each with a destination prefix and a next-hop. Which YANG construct should be used to represent the collection of route entries?

   • AA leaf-list named 'route' inside a container named 'routing-table'
   • BA list named 'route' inside a container named 'routing-table'
   • CA container named 'route' inside a container named 'routing-table'
   • DA leaf named 'route' inside a container named 'routing-table'
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6. 15expert · hard

   A network automation team is building a CI/CD pipeline for network configuration changes. They want to validate the configuration against a YANG model before deploying it to production devices. Which approach best integrates YANG validation into the pipeline?

   • ASkip validation and rely on post-deployment monitoring to detect issues.
   • BUse a YANG validator tool in the pipeline to check the configuration against the model.
   • CUse a Python script that parses the configuration and checks for common errors.
   • DDeploy the configuration directly to a staging device and rely on the device to reject invalid configurations.
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