B & E are correct
The Network Configuration Protocol (NetConf) uses an Extensible Markup Language (XML) to communicate with the switches and routers to install and make configuration changes.
NETCONF is an XML-based protocol used for configuration and monitoring devices in the network.
https://www.sdxcentral.com/networking/sdn/definitions/what-the-definition-of-software-defined-networking-sdn/southbound-interface-api/#:~:text=The%20Network%20Configuration%20Protocol%20(NetConf)%20uses%20an%20Extensible%20Markup%20Language%20(XML)%20to%20communicate%20with%20the%20switches%20and%20routers%20to%20install%20and%20make%20configuration%20changes
https://docs.opendaylight.org/projects/netconf/en/latest/user-guide.html#:~:text=NETCONF%20is%20an%20XML%2Dbased%20protocol%20used%20for%20configuration%20and%20monitoring%20devices%20in%20the%20network.
The correct options are:
A. Northbound API is based on RESTCONF and JSON.
E. Northbound API is RESTful using JSON.
Both of these options correctly describe the characteristics of the vManage's Northbound API. Thank you for your understanding, Nuno!
*vSmart* uses OMP and DTLS for communication with edge devices.
*vManage* uses NetConf according to Cisco's presentation (above linked pdf) on this very topic:
vManage REST APIs
• vManage uses REST architecture which is stateless, client–server, cacheable
communications protocol.
• vManage exposes REST APIs and webhooks to integrate with 3rd party systems
• vManage uses NetConf for configuring and managing edge devices
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