8. Apply Concepts of Model Driven Programmability (YANG, RESTCONF, and NETCONF) in a Cisco Environment 200-901 Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   A developer is testing a RESTCONF script against a Cisco device and receives a 401 Unauthorized response for every request. The developer has verified that the username and password are correct. What is the most likely cause?

   • AThe device does not have RESTCONF enabled.
   • BThe device requires HTTP Basic authentication, but the script is sending a Bearer token.
   • CThe script is using HTTPS instead of HTTP.
   • DThe script is using the wrong RESTCONF base path, such as /restconf/data instead of /restconf.
   Reveal Solution Discussion Select an answer first
2. 7expert · hard

   A network administrator is using NETCONF to automate configuration changes on a Cisco IOS XE router. The administrator sends an edit-config operation to add a new loopback interface, but the operation fails with an error. The administrator checks the NETCONF session and sees that the device returned an 'operation-failed' error. What is the most likely cause of this failure?

   • AThe interface name or number is already in use, or the configuration is invalid for the device platform.
   • BThe YANG module for the interface is not loaded on the device.
   • CThe NETCONF session is not using SSH.
   • DThe administrator is using the wrong datastore, such as 'candidate' instead of 'running'.
   Reveal Solution Discussion Select an answer first
4. 8foundation · easy

   What is the purpose of the <capabilities> exchange in NETCONF?

   • ATo synchronize the configuration datastores between client and server.
   • BTo allow the client and server to discover each other's supported features and operations.
   • CTo negotiate the encoding format (XML or JSON) for the session.
   • DTo authenticate the client and server during the session.
   Reveal Solution Discussion Select an answer first
5. 9application · medium

   A network engineer is building a script that needs to perform a full replacement of a device's configuration using a YANG-modeled API. The engineer wants to use a protocol that supports a 'copy-config' operation. Which protocol should the engineer use?

   • ASNMP
   • BRESTCONF
   • CgRPC
   • DNETCONF
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6. 10expert · hard

   A network engineer is using NETCONF to configure a Cisco device and needs to ensure that a specific configuration change is applied only if the device is in a certain state. The engineer wants to use a conditional operation that fails if the condition is not met. Which NETCONF feature should the engineer use?

   • AUse the <test-option> parameter with 'test-then-set' in edit-config.
   • BUse the <lock> operation to ensure exclusive access before applying the change.
   • CUse the <get> operation to check the state, then conditionally send edit-config based on the result.
   • DUse the <error-option> parameter with 'rollback-on-error' in edit-config.
   Reveal Solution Discussion Select an answer first