JNCIA-Design study guide
JNCIA-Design · Work through your exam, one topic at a time.
JNCIA-Design is the associate-level design credential in the Juniper certification family, aimed at network engineers, pre-sales and solution architects, and operations staff who want to show they can plan networks rather than only configure devices. Candidates typically already hold a routing or switching associate certification or have hands-on experience with Junos, and are moving toward design-oriented or architecture roles. The JNCIA-Design study guide has 5 sections and about 1,443 words.
01Network Design Fundamentals
Network Design Fundamentals covers the disciplined process of turning business requirements into a repeatable, documented Juniper-based design. Expect questions on requirements gathering, hierarchical models, availability, capacity planning, modularity, and lifecycle governance rather than product speeds alone.
293 words, about 1 min02Campus and Enterprise LAN Design
Campus and Enterprise LAN Design tests Layer 2 and Layer 3 campus topology, VLAN segmentation, loop prevention, first-hop redundancy, link aggregation, PoE, and wireless integration in Juniper EX/QFX environments. Keep Layer 2 domains small; route at distribution where possible.
303 words, about 2 min03WAN and Service Provider Connectivity Design
WAN and Service Provider Connectivity Design covers WAN topology choices, MPLS L3VPN, internet VPN, BGP, SD-WAN overlays, QoS, and resilient carrier design for Juniper MX and SRX platforms. Match topology to traffic: hub-and-spoke for centralized policy, partial mesh for regional traffic, full mesh only when any-to-any volume justifies it.
293 words, about 1 min04Data Center Design
Data Center Design tests spine-leaf topology, Layer 3 underlay, EVPN-VXLAN overlay, multihoming, oversubscription, automation, and failure-domain planning with Juniper QFX and Apstra. Build a non-blocking or predictable oversubscription spine-leaf fabric; keep leaf-to-spine links equal cost.
278 words, about 1 min05Network Security Design
Network Security Design tests zoning, policy enforcement, segmentation, firewall placement, IPsec, NAT, IPS/UTM, and high availability on Juniper SRX. Segment by trust level and function: untrust, DMZ, trust, management; default deny between zones.
276 words, about 1 min