11. Interpret Basic YANG Models 200-901 Practice Questions (Page 5)

Questions 21–25

1. 21foundation · easy

   In a YANG module, what is the role of a 'prefix'?

   • AA short alias used to refer to the module's namespace in the module itself and in imports
   • BA mandatory keyword that must be the same as the module name
   • CA list of all data nodes defined in the module
   • DA version number that indicates the module's revision
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2. 22expert · hard

   A YANG module defines a container 'interfaces' with a list 'interface' keyed by 'name'. Each interface has a leaf 'mtu' of type 'uint16' and a leaf 'enabled' of type 'boolean'. An automation script needs to disable all interfaces that have an MTU greater than 1500. The script uses RESTCONF to retrieve the current configuration. Which approach is the most efficient?

   • ARetrieve the entire 'interfaces' container, filter locally, and send a PATCH for each interface that needs to be disabled.
   • BSend a single PATCH request that disables all interfaces regardless of MTU.
   • CUse a NETCONF filter to retrieve only interfaces with MTU > 1500, then disable them.
   • DSend a GET request for each interface and check the MTU, then send a PATCH to disable it.
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4. 23expert · hard

   A network architect is designing a configuration management system for a large enterprise. The system must support multiple teams that need to make changes to different parts of the configuration concurrently. The architect is considering using YANG with NETCONF. Which feature of NETCONF/YANG is most important for this requirement?

   • AThe ability to define custom RPCs in YANG.
   • BThe use of XML encoding for data.
   • CThe use of datastores, such as the candidate datastore, to stage and commit changes.
   • DThe ability to define access control lists in YANG models.
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5. 24expert · hard

   A network automation engineer is integrating a third-party YANG module into their system. The module imports another module using the statement: import ietf-inet-types { prefix inet; }. The engineer wants to use the type 'ipv4-address' from the imported module. How should the type be referenced in the local module?

   • Atype ipv4-address;
   • Btype inet:ipv4-address;
   • Ctype string;
   • Dtype ietf-inet-types:ipv4-address;
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6. 25foundation · easy

   Which CRUD operation is used to change the value of an existing leaf node in a YANG data tree?

   • ARead
   • BDelete
   • CUpdate
   • DCreate
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