JNCIA-DC study guide
JNCIA-DC · Work through your exam, one topic at a time.
The JNCIA-DC is Juniper Networks' associate-level certification in the Data Center track. It is aimed at networking professionals with beginner-to-intermediate knowledge who want to demonstrate a working command of Junos OS in a data center context. Because the associate tier is built on core Junos OS knowledge, the exam objectives emphasize the same building blocks that underpin other Juniper associate credentials: networking fundamentals such as Ethernet, Layer 2 and Layer 3 addressing, subnetting and longest-match routing; Junos OS architecture, including the separation of control and forwarding planes and the roles of the Routing Engine and Packet Forwarding Engine; the CLI, its modes, navigation, help, output filtering, and the active-versus-candidate configuration model; initial device configuration, user accounts, login classes, configuration groups, NTP, SNMP, logging, archival and the rescue configuration; operational monitoring with show and monitor commands, interface statistics and network tools; routing fundamentals including routing versus forwarding tables, route preference, routing instances and static routing; and routing policy and firewall filters, covering policy flow, match conditions and actions, and unicast RPF. Preparation should combine the recommended training and exam resources with hands-on practice on Junos devices, since pass/fail status is reported immediately after the exam and the exam is delivered only in English. The JNCIA-DC study guide has 4 sections and about 1,331 words.
01Data Center Architecture and Networking Fundamentals
This domain tests how Juniper data center fabrics are built: spine-leaf topology, the routed IP underlay, the VXLAN/EVPN overlay, and multi-chassis redundancy. A Juniper data center design separates the physical IP fabric (underlay) from the virtual network (overlay).
370 words, about 2 min02Junos OS Fundamentals and User Interfaces
This domain tests Junos OS architecture and user interfaces: the separation of control and forwarding planes, the candidate configuration model, commit and rollback operations, and the CLI modes used on Juniper data center switches. Junos runs routing protocols and management on the Routing Engine (control plane) and forwards packets in the Packet Forwarding Engine (data plane).
289 words, about 1 min03Data Center Configuration Basics and Monitoring
This domain tests the practical Junos configuration used on data center leaf and spine switches-VLANs, access and trunk ports, link aggregation, VXLAN/EVPN, and the monitoring commands that prove the design works. On ELS-enabled QFX/EX switches, put server ports in family ethernet-switching with interface-mode access and a vlan member.
312 words, about 2 min04Routing, Policy, and Firewall Filters
This domain tests routing and security controls on Junos data center devices: route preference, BGP/OSPF behavior, routing policy, and stateless firewall filters that protect the Routing Engine and filter traffic. Junos prefers lower route preference values: direct/local 0, static 5, OSPF internal 10, OSPF external 150, BGP 170.
360 words, about 2 min