5.4 Describe the High-Level Principles and Benefits of a Data Modeling Language, Such as YANG 350-501 Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A YANG module defines a leaf of type 'enumeration' with values 'up', 'down', and 'testing'. What does this type definition accomplish?

   • AIt allows the leaf to hold any string value.
   • BIt defines a range of numeric values.
   • CIt restricts the leaf to one of the listed values.
   • DIt makes the leaf read-only.
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2. 17expert · hard

   A network architect is designing a YANG module that must be extensible to support future features without breaking existing clients. The architect wants to allow adding new leaves to a container in future revisions. Which YANG principle or feature is most important to consider?

   • AUse the 'config' statement to make all leaves read-only.
   • BUse the 'default' statement to provide default values for new leaves.
   • CUse the 'if-feature' statement to conditionally include optional features.
   • DUse the 'mandatory' statement to require all leaves.
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   What is the primary purpose of a data modeling language such as YANG in network automation?

   • ATo replace SNMP as the primary protocol for network monitoring
   • BTo provide a graphical user interface for network administrators
   • CTo define a vendor-neutral, machine-readable description of network configuration and state data
   • DTo encrypt network configuration data in transit
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5. 19application · medium

   A network engineer is evaluating YANG for a new automation project. The engineer wants to understand why YANG is preferred over using JSON or XML directly for configuration. What is the key advantage of YANG in this context?

   • AYANG is a protocol that can replace NETCONF.
   • BYANG is a data modeling language that defines the structure and constraints of the data.
   • CYANG is a database that stores configuration data.
   • DYANG is a programming language that can execute logic.
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6. 20application · medium

   A YANG module defines a container called 'system' that contains a leaf called 'hostname'. The module also defines a notification called 'system-reboot'. What is the relationship between the container and the notification?

   • AThe container is a child of the notification.
   • BThe notification is a child of the container.
   • CThe notification can only be sent if the container is configured.
   • DThey are both top-level constructs in the module.
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