The JNCIA-Junos is the entry-level Junos certification and the door to JNCIS and beyond.

1. JNCIA-Junos In 2026: What It Tests

  1. Junos OS Fundamentals (25%)
  2. Routing Fundamentals (20%)
  3. Routing Policy and Firewall Filters (20%)
  4. Networking Fundamentals (15%)
  5. Class-of-Service basics (5%)
  6. High Availability (15%)

60 multiple-choice + 5 drag-and-drop + 5 simulation questions, 90 minutes, 70% to pass.

If you are starting from scratch, allocate 80–120 hours of study across 6 weeks. If you have IOS/CLI experience, 50 hours is usually enough.

2. Lab Setup — Spend $5 or Build It Free

vSRX and vMX are free for non-production use after Juniper account signup. Quad-core CPU, 16 GB RAM, 60 GB SSD, and any Tier-1 hypervisor work.

2.1 vSRX Day-One

set system root-authentication plain-text-password
set system services ssh
set system login user juniper class super-user authentication plain-text-password
set interfaces ge-0/0/0 unit 0 family inet address 192.168.1.10/24
commit

3. Week-By-Week

Week 1 — Operational + Configuration Hierarchy (15 h)

Master: show | compare, commit check, commit confirmed 5, rollback 1.

Week 2 — Routing Fundamentals (15 h)

Static routes, aggregate, OSPF multi-area basics and LSA types, BGP path-selection basics.

Week 3 — Routing Policy + Firewall Filters (15 h)

Policy chain: term → from → then. Build 10 example policies.

Week 4 — CoS + HA (15 h)

CoS pipeline in 60 minutes. HA conceptually.

Week 5 — Mega-Drills (15 h)

Day One books free. Re-take every domain quiz twice.

Week 6 — Exam Simulation (10 h)

Take 2 timed practice exams. Schedule for Wednesday of week 6.

4. Free Resources

  • Juniper Tech Library — every PDF and config guide is free.
  • Juniper vLabs — live long-running sandbox.
  • Day One books — Juniper-funded mini-books, completely free.
  • Juniper Engineering blog — case studies and best-practice articles.
  • JuniperClient.com — practical lab-tested guides.

5. Exam-Day Strategy

  1. Sleep 7+ hours before.
  2. Skip simulations on first pass; answer all 60 multiple choice first.
  3. Simulations are about the sequence.
  4. Read question once, code once, answer.
  5. Never leave a question unanswered.

6. After You Pass

Choose SP (ISP/telecom), ENT (campus), SEC (SRX is your daily driver) or DC (EVPN-VXLAN fabrics).

7. Closing

The first lab you should run on this path is OSPF on MX: OSPF on MX. Then SRX zone firewall. For BGP that the next level will hit, see BGP flap field method.