8. Apply Concepts of Model Driven Programmability (YANG, RESTCONF, and NETCONF) in a Cisco Environment 200-901 Practice Questions (Page 7)

Questions 31–35

1. 31expert · hard

   A network administrator is using NETCONF to manage a Cisco IOS XE device. The administrator sends an edit-config operation to change the hostname, but receives an error with error-tag 'access-denied'. The administrator has verified that the username and password are correct. What is the most likely cause of this error?

   • AThe device does not support the YANG model for hostname.
   • BThe NETCONF session is not encrypted.
   • CThe user account does not have the necessary privilege level to modify the configuration.
   • DThe administrator is using the wrong datastore.
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2. 32application · medium

   A network engineer needs to programmatically change the hostname of a Cisco IOS XE device from a Python script. The script will run on a management server that only has outbound HTTPS access to the device. The engineer wants to use a YANG-modeled API and prefers a simple HTTP-based approach. Which action should the engineer take?

   • AEstablish an SSH session and use NETCONF edit-config to change the hostname.
   • BSend a POST request to /restconf/operations/hostname with the new hostname in XML.
   • CUse the Cisco IOS XE CLI via a reverse Telnet session to change the hostname.
   • DSend a PUT request to /restconf/data/Cisco-IOS-XE-native:native/hostname with the new hostname in JSON.
   Reveal Solution Discussion Select an answer first
4. 33application · medium

   A developer is using RESTCONF to create a new VLAN on a Cisco switch. The developer sends a POST request to /restconf/data/Cisco-IOS-XE-native:native/vlan with a JSON payload containing the VLAN details. The request fails with a 409 Conflict error. What is the most likely cause?

   • AThe VLAN already exists, and the POST attempted to create a duplicate resource.
   • BThe JSON payload was malformed and could not be parsed.
   • CThe device does not support the Cisco-IOS-XE-native module.
   • DThe user lacks write permission to the VLAN container.
   Reveal Solution Discussion Select an answer first
5. 34application · medium

   A network engineer needs to programmatically change the hostname of a Cisco IOS XE device. The engineer wants to use a RESTful API that supports JSON encoding and must verify the change was applied by retrieving the running configuration. Which two-step approach should the engineer use with RESTCONF?

   • ASend an HTTP PATCH to /restconf/data/Cisco-IOS-XE-native:native/hostname with the new hostname, then send an HTTP GET to /restconf/operations/ to confirm.
   • BSend an HTTP PUT to /restconf/data/Cisco-IOS-XE-native:native/hostname with the new hostname, then send an HTTP GET to the same URI to confirm.
   • CSend an HTTP DELETE to /restconf/data/Cisco-IOS-XE-native:native/hostname, then send an HTTP POST to the same URI with the new hostname to recreate it.
   • DSend an HTTP POST to /restconf/data/Cisco-IOS-XE-native:native/hostname with the new hostname, then send an HTTP GET to /restconf/data/Cisco-IOS-XE-native:native to confirm.
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6. 35foundation · easy

   Which of the following best describes the role of YANG in a Cisco IOS XE device?

   • AIt defines the data models that represent the device's configuration and operational state.
   • BIt is a database that stores the running configuration of the device.
   • CIt provides a set of CLI commands that can be used to configure the device.
   • DIt is a protocol that replaces SSH for secure management.
   Reveal Solution Discussion Select an answer first