JNCIS-ENT

The exam is 90 minutes long and contains 65 multiple-choice questions. That works out to roughly 80 seconds per question, so it rewards fast recognition of Junos command output and configuration syntax over lengthy deliberation. Flag anything that requires deep calculation and come back to it.

Yes. JNCIA-Junos is listed as the prerequisite certification for JN0-352. Confirm your JNCIA-Junos status is active in your Juniper certification account before booking, since Juniper certifications are valid for three years and an expired associate credential can block your specialist registration.

The exam is based on Junos 23.1. Configuration syntax and show command output in the questions reflect that release, so study material and lab devices on much older Junos versions may use different command forms or default behaviors. Verify defaults against 23.1 documentation rather than memory.

The exam is delivered by Pearson VUE and is provided only in English. Juniper does not list translated versions on the exam page, so plan for English terminology throughout. Registration is handled through Pearson VUE, and pass/fail status is available immediately after you finish the exam.

Juniper does not publish retake rules on the JNCIS-ENT exam page; the certification policies page is the authoritative source for waiting periods and attempt limits. Check that policy page before scheduling, and treat any specific retake interval you hear secondhand as unverified until you confirm it there.

Juniper certifications are valid for three years. After that you need to recertify to keep the credential active. Because the exam tracks a specific Junos release, recertifying also refreshes your knowledge against whatever software version is current when you retake it.

Juniper recommends the Junos Intermediate Routing and Junos Enterprise Switching courses, along with practice exams and exam prep webinars. Juniper states these resources are not required and that using them does not guarantee you will pass, so pair them with hands-on lab time on your own devices.

Build from switching outward: Layer 2 switching and VLANs, then Spanning Tree, then Layer 2 security, since the security features assume you understand bridging and STP behavior. Move to protocol-independent routing, then the IGPs (OSPF and IS-IS), then BGP, and finish with tunnels and high availability.

Protocol-independent routing and high availability are often underestimated because they look simple on paper. Filter-based forwarding, Martian addresses, RIB groups, redundant trunk groups, graceful restart versus GRES versus NSR, and VRRP all reward precise knowledge of how the pieces interact rather than definitions alone.