This guide covers all foundational topics for the JNCIA-Junos certification, including Junos OS fundamentals, configuration, routing, security, and troubleshooting.
This guide works best as a loop: read a chapter, test yourself with practice questions, look up unfamiliar terms in the glossary, then move to the next chapter.
15 chapters covering every exam objective. Each chapter includes key concepts, exam tips, common traps, comparison tables, and a 5-question quiz at the end.
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Go to practice testEvery JNCIA-JUNOSterm defined and searchable. Use it when a chapter mentions a concept you haven't seen before or want a quick refresher on.
Browse glossaryExam blueprint, domain weights, passing score, duration, cost, and registration links. Start here if you're new to this certification.
View exam guideJuniper Networks and Junos OS Overview
Objective 1.1 · Describe the function and architecture of Juniper Networks devices and the Junos OS.
Junos OS CLI Fundamentals
Objective 1.2 · Navigate the Junos CLI, including operational and configuration modes.
User Accounts and Authentication
Objective 2.1 · Configure and manage user authentication, login classes, and local user accounts.
Junos Configuration Basics
Objective 2.2 · Explain the Junos configuration hierarchy, commit model, and configuration management.
Junos System Monitoring and Maintenance
Objective 2.3 · Monitor system health, view logs, and perform system maintenance tasks.
Junos File Management and Software Upgrades
Objective 2.4 · Manage files, images, and perform Junos OS software upgrades.
Junos Network Interface Configuration
Objective 3.1 · Configure and verify physical and logical interfaces (including Ethernet, aggregated, and loopback).
Protocol-Independent Routing (Static Routes and Defaults)
Objective 3.2 · Configure static routes, default routes, and routing options on Junos devices.
Junos OSPF Configuration Basics
Objective 3.3 · Configure and verify OSPF (single area) on Junos.
Junos Routing Policy and Firewall Filters
Objective 3.4 · Apply routing policy and configure firewall filters to control traffic.
Junos VLAN and Layer 2 Switching
Objective 4.1 · Configure VLANs, trunking, and basic layer 2 switching on Junos devices.
Junos Spanning Tree Protocol (STP, RSTP)
Objective 4.2 · Configure and verify Spanning Tree Protocol and Rapid Spanning Tree Protocol on Junos.
Junos Security Zones and Policies
Objective 5.1 · Configure security zones, inter-zone and intra-zone security policies.
Junos NAT Configuration (Source, Destination, Static)
Objective 5.2 · Configure and verify NAT rules including source, destination, and static NAT on Junos.
Junos Troubleshooting Basics
Objective 6.1 · Use monitoring, logging, and diagnostic tools to troubleshoot common Junos issues.
Free JNCIA-JUNOS practice questions with full explanations. Test what you learn chapter by chapter.
JNCIA-JUNOS Practice Questions