8. Apply Concepts of Model Driven Programmability (YANG, RESTCONF, and NETCONF) in a Cisco Environment 200-901 Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A network engineer is troubleshooting a NETCONF session that fails during the <hello> exchange. The engineer sees that the device sends its capabilities, but the client does not receive the expected <hello> reply. What is the most likely cause?

   • AThe client is using an unsupported NETCONF version in its <hello> message.
   • BThe device is configured with a different YANG module set than the client expects.
   • CThe client is using the wrong SSH port for NETCONF.
   • DThe client is sending <get-config> before the <hello> exchange is complete.
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   A network engineer needs to back up the entire running configuration of a Cisco device to a file using NETCONF. The engineer wants to retrieve the complete configuration in one operation. Which NETCONF operation should the engineer use?

   • Acopy-config from running to a file on the device
   • Bget-config with no filter
   • Cedit-config with a merge operation
   • Dget with no filter
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4. 18expert · hard

   A network engineer is using RESTCONF to update the description of an interface on a Cisco IOS XE device. The engineer sends a PATCH request to /restconf/data/Cisco-IOS-XE-native:native/interface/GigabitEthernet=1/description with a JSON body containing the new description. The request succeeds, but the engineer notices that the description is not updated. What is the most likely cause?

   • AThe interface name is incorrect, so the request targeted a different interface.
   • BThe device does not support the Cisco-IOS-XE-native model.
   • CThe JSON body is missing the 'description' key in the data wrapper.
   • DThe engineer used PATCH instead of PUT.
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   Which of the following is a key difference between NETCONF and RESTCONF?

   • ANETCONF supports JSON encoding, while RESTCONF supports XML only.
   • BNETCONF is a remote procedure call (RPC) protocol, while RESTCONF is a RESTful API.
   • CNETCONF uses HTTP, while RESTCONF uses SSH.
   • DNETCONF is used for state data, while RESTCONF is used for configuration data.
   Reveal Solution Discussion Select an answer first
6. 20expert · hard

   A network automation team is building a system that must support both bulk configuration of many devices and real-time retrieval of operational state. The team values transactional consistency for configuration changes but also wants to minimize the number of open connections. Which approach best meets these requirements?

   • AUse RESTCONF for configuration changes and NETCONF for state retrieval.
   • BUse NETCONF for both configuration and state retrieval to maintain a single protocol.
   • CUse NETCONF for configuration changes with the candidate datastore and commit, and use RESTCONF for state retrieval.
   • DUse RESTCONF for both configuration and state retrieval to minimize connection overhead.
   Reveal Solution Discussion Select an answer first