A network engineer is developing a Python script using PyEZ to apply a new BGP configuration to a Junos device. The script must ensure that the configuration is syntactically correct before attempting to merge it into the candidate configuration. Which sequence of PyEZ `Config` methods provides the most efficient and safe way to achieve this?
While troubleshooting a failing NETCONF session, an automation engineer captures the following RPC reply from a Junos device: ```xml protocol operation-failed error bgp Configuration is locked ``` Based on this output, what is the root cause of the failure?
When defining infrastructure variables for configuration management tools like Ansible, what is the primary advantage of using YAML over JSON?
A network automation team is integrating JSNAPy into their CI/CD pipeline to validate network changes. At which stage of the pipeline would the execution of JSNAPy tests provide the most value?
Which cURL command correctly uses the Junos REST API to replace the entire configuration for the `ge-0/0/1` interface with content from a local file named `interface.json`?
A Python script using PyEZ needs to retrieve the BGP summary information and then process only the neighbors that are in the 'Established' state. Given that `dev.rpc.get_bgp_summary_information()` returns a complex XML object, what is the most effective way to access the desired data?
What is the function of the `operation="merge"` attribute within a NETCONF ` ` RPC sent to a Junos device?
**Company Background:** Global Financial Services Inc. operates a large-scale network with strict compliance and uptime requirements. Network changes are only permitted during scheduled weekly maintenance windows and must be rigorously validated to prevent service disruptions. The network operations team is small and needs to automate as much of the change validation process as possible to reduce human error and meet tight deadlines. **Current Situation:** The team currently relies on manual CLI commands to check the state of core routers before and after applying configuration changes. This process is slow, error-prone, and generates inconsistent reports. They have decided to build an automated solution using Python, leveraging the PyEZ library for device interaction and JSNAPy for state validation. **Technical Requirements:** 1. The solution must be a single Python script that can be executed from a central automation server. 2. Before applying any changes, the script must capture a 'pre-change' snapshot of the device state. This must include the full IPv4 routing table, the status of all BGP sessions, and the operational status of all physical interfaces. 3. After changes are applied (manually or by another script), the script must capture a 'post-change' snapshot of the same data points. 4. The script must compare the two snapshots and generate a simple, clear report indicating a PASS or FAIL status. A FAIL status should be triggered if any BGP sessions have dropped, any critical interfaces have gone down, or if specific critical routes are missing from the routing table. **Constraint:** The solution must not require any custom daemons or agents to be installed on the Junos devices themselves. Which approach best satisfies all the requirements for this automated validation solution?
An engineer is creating a YAML file to store a list of NTP servers. Which of the following snippets are syntactically correct representations of a list in YAML? (Select TWO)
True or False: In a mature DevOps workflow, the principle of Infrastructure as Code (IaC) encourages defining network configurations in version-controlled files, which are then used to automate deployments, ensuring consistency and repeatability.