Cisco 300-435 - Automating Cisco Enterprise Solutions (ENAUTO)

To construct this URL, one needs to understand REST API call structure and how it relates to Cisco SD-WAN vManage APIs specifically. The base URL starts with ‘https://’, followed by ‘vmanage-ip-address’ which should be replaced with the actual IP address or hostname of vManage. ‘/dataservice/’ is a common prefix in all vManage REST API calls indicating that data service is being accessed. Following this, ‘/device/bfd/sessions/history’ specifies that we are interested in accessing historical data about Bidirectional Forwarding Detection sessions on devices. Finally, ‘?deviceId=’ is a query parameter where one must provide an actual device ID instead of ‘ ’ placeholder. References: ( Automating Cisco Enterprise Solutions Official Cert Guide )

https://vmanage-ip-address/dataservice/device/bfd/synced/sessions?deviceId=deviceId

 Python virtual environments should be used in cases where there are conflicting Python package versions across multiple projects (Option B) to ensure each project can have its own set of dependencies. Additionally, they are beneficial when starting a new project that requires a clean development environment (Option E), as it allows for a controlled setup without interference from other projects’ dependencies. References := ( Automating Cisco Enterprise Solutions Official Cert Guide )

The YANG module tree diagram represents the data model for network configuration and state data used by management protocols like NETCONF and RESTCONF. In this diagram, containers are denoted by curly braces {} and represent groupings of related data within the model. The three containers identified in the image are “interface,” “statistics,” and “discontinuity-time,” which organize related configuration or state information.

References: Automating Cisco Enterprise Solutions Official Cert Guide

To access the hostname from the JSON data assigned to the variable “d”, one must navigate through the nested dictionaries and lists. The correct syntax in Python for accessing a dictionary is using square brackets with the key as a string. Therefore, ‘d[“data”]’ accesses the value associated with the key “data”, which is a list. ‘[0]’ accesses the first item in that list, which is another dictionary. Finally, ‘[“host-name”]’ retrieves the value associated with “host-name” from that dictionary. References: ( Automating Cisco Enterprise Solutions Official Cert Guide )

NETCONF, unlike RESTCONF, allows for the validation of a candidate datastore before it is committed as the running configuration. This feature ensures that any configuration changes are checked for correctness before they can potentially impact the network operation. 

The exhibit is a read-only YANG leaf ("ro vlan") therefore is classed as "state" date and not config data. As such the statement is what you need to use to interact with this particular YANG model. Reference documentation: https://blogs.cisco.com/developer/ask-hank-yang-leaves

 In RESTCONF API calls, when specifying the content type in HTTP headers for requests or responses involving YANG-modeled data, ‘yang-data+json’ is used as part of the ‘Accept’ or ‘Content-Type’ headers to indicate that the message body contains JSON-encoded YANG-modeled data.

In this Python script using RESTCONF, ‘yang-data+json’ completes the highlighted areas because it specifies that JSON format is expected in response which conforms with YANG data modeling standards.

References: Automating Cisco Enterprise Solutions Official Cert Guide