JCPA case studies
JCPA · Put your knowledge to work in context.
The Juniper Networks Certified Professional Automation credential (often written JNCIP-Automation, and listed here under the alias JCPA) is a professional-level certification aimed at network engineers who build and operate automated Juniper environments rather than configure devices by hand. It suits engineers with hands-on Junos experience who now write code, drive devices through APIs and data models, and manage change through pipelines. The JCPA case studies are 5 cases and about 2,829 words.
1Nightly Config Push Fails on Two Devices After PyEZ Upgrade
A team runs a Junos PyEZ script from a CI runner every night at 02:00 to push a standard set system ntp server stanza to 140 devices. After upgrading PyEZ from 2.5 to 2.7, 138 devices succeed but two MX routers fail with ConnectTimeoutError at the NETCONF handshake.
585 words, about 3 min2YANG Model Mismatch Breaks RESTCONF GET for Interfaces
An engineer writes a Python tool that calls GET https://router.example.com/restconf/data/ietf-interfaces:interfaces against a Junos device running a recent Junos release. The tool expects JSON and parses response.json()['ietf-interfaces:interfaces']['interface'] .
548 words, about 3 min3Telemetry Stream Overwhelms Collector After Adding Interfaces
A team deploys gNMI telemetry from 24 Junos devices to a single collector. Initially they subscribe to /interfaces/interface/state/counters at 10s intervals on 8 uplinks per device.
578 words, about 3 min4Git Workflow and CI Gate for a Multi-Device Config Change
A network team of 6 engineers manages 300 devices with Ansible and Jinja2 templates in a Git repo. Today they edit templates on a shared jump host and run playbooks manually.
553 words, about 3 min5Event-Driven Remediation Loops on a Flapping Link
A team deploys an event-driven automation app: when a syslog/telemetry event indicates an interface went down, a Python handler runs a playbook that disables the interface and opens a ticket. During a maintenance window, a link flaps 40 times in 10 minutes (expected, due to fiber work).
565 words, about 3 min