JN0-352
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The Juniper Networks Certified Specialist, Enterprise Routing and Switching JN0-352 exam tests intermediate Junos routing and switching knowledge. It is the written exam for the Enterprise Routing and Switching, Specialist (JNCIS-ENT) certification.
Candidates should be able to explain, configure, monitor, and troubleshoot common enterprise switching and routing technologies on Junos. The official objectives use Junos 23.1 as the software baseline.
Page Contents
- JN0-352 Exam Overview
- Exam Information
- Target Audience and Prerequisite
- Software Version
- Exam Objectives
- Skills and Technologies Covered
- Preparation Priorities
- Common Preparation Mistakes
- Free JN0-352 Sample Questions
- Frequently Asked Questions
- JN0-352 Study Materials
- Disclaimer
JN0-352 Exam Overview
JN0-352 covers the technologies used to build and operate Juniper enterprise networks. The exam moves from Layer 2 switching and protection into static and policy-based routing, OSPF, IS-IS, BGP, tunnels, and high availability.
The objectives do not stop at definitions. Candidates are expected to recognize configuration requirements, read operational output, select monitoring tools, and troubleshoot protocol or forwarding problems.
JN0-352 Exam Information
| Exam Item | Details |
| Exam Code | JN0-352 |
| Certification | Enterprise Routing and Switching, Specialist (JNCIS-ENT) |
| Certification Level | Specialist |
| Exam Duration | 90 minutes |
| Number of Questions | 65 |
| Question Format | Multiple-choice |
| Language | English |
| Delivery | Pearson VUE |
| Prerequisite Certification | JNCIA-Junos |
| Software Version | Junos 23.1 |
| Result | Immediate pass or fail status |
| Certification Validity | Three years |
Who Should Take the JN0-352 Exam?
JN0-352 is intended for network professionals with beginner-to-intermediate knowledge of Junos enterprise routing and switching. It suits engineers and administrators who already understand basic Junos operation and now work with multi-switch and multi-router environments.
JNCIA-Junos is the prerequisite certification. Before starting JN0-352 preparation, candidates should be comfortable with the Junos CLI, interface configuration, routing tables, firewall filters, routing policy, and routine operational commands.
JN0-352 Software Version
The official exam page identifies Junos 23.1 as the software baseline. Study materials should use this version when behavior or syntax varies between Junos releases. The V8.02 label found in some local question-bank records is a content version, not an official Junos or exam version.
JN0-352 Exam Objectives
Juniper publishes nine exam areas but does not assign domain percentages. The order below follows the official page.
| Domain | Main Focus |
| 1. Layer 2 Switching or VLANs | Bridging, frame processing, port modes, tagging, native and voice VLANs, interfaces, and inter-VLAN routing. |
| 2. Spanning Tree | STP and RSTP operation, roles, states, BPDUs, convergence, configuration, monitoring, and troubleshooting. |
| 3. Layer 2 Security | Protection features, port security, DHCP snooping, DAI, IP source guard, MACsec, storm control, and Layer 2 firewall filters. |
| 4. Protocol Independent Routing | Static, aggregate, and generated routes, martian addresses, routing instances, RIB groups, load balancing, and filter-based forwarding. |
| 5. OSPF | Databases, packets, neighbors, DR and BDR, areas, router types, LSAs, policy, monitoring, and troubleshooting. |
| 6. IS-IS | Databases, PDUs, TLVs, adjacencies, levels, areas, DIS, metrics, policy, monitoring, and troubleshooting. |
| 7. BGP | Messages, attributes, route selection, IBGP and EBGP behavior, peers, groups, routing policy, monitoring, and troubleshooting. |
| 8. Tunnels | IP tunneling use cases, requirements, GRE and IP-IP configuration, verification, and troubleshooting. |
| 9. High Availability | LAG, RTG, Virtual Chassis, graceful restart, GRES, NSR, NSB, BFD, VRRP, and Unified ISSU. |
Skills and Technologies Covered
The exam expects candidates to move between concepts and Junos operations. For each domain, know what the technology does, which configuration choices affect it, what healthy operation looks like, and which output helps isolate a fault.
Useful tools include ping, traceroute, traceoptions, show commands, and system logging. Configuration and troubleshooting are both part of the OSPF, IS-IS, BGP, tunnels, security, and high-availability objectives.
JN0-352 Preparation Priorities
- Build small VLAN, STP, routing, and high-availability labs instead of relying only on command lists.
- Compare OSPF, IS-IS, and BGP neighbor formation, databases, route selection, and troubleshooting output.
- Practice routing policy with static, aggregate, generated, OSPF, IS-IS, and BGP routes.
- Review Layer 2 protection features by threat, required configuration, and verification method.
- Learn which operational command answers a specific troubleshooting question.
- Use Junos 23.1 documentation when a feature or command differs by release.
Common Preparation Mistakes
Learning Commands Without Reading Their Output
Knowing a show command is only the first step. Practice finding neighbor state, route preference, next hop, active path, interface status, and error indicators in the output.
Mixing OSPF and IS-IS Terminology
Both are link-state protocols, but their packet formats, hierarchy, designated-router behavior, and database terminology differ. A side-by-side comparison helps prevent avoidable errors.
Ignoring Policy Direction
Import and export policy mistakes are common in Junos questions. Identify the protocol, direction, route source, and intended routing-table result before selecting a policy action.
Treating High Availability as One Feature
LAG, Virtual Chassis, graceful restart, GRES, NSR, NSB, BFD, VRRP, and ISSU solve different availability problems. Learn the failure each one addresses and its dependencies.
Free JN0-352 Sample Questions
Frequently Asked Questions
Is JN0-352 suitable for someone new to Junos?
A complete beginner should start with JNCIA-Junos. JN0-352 assumes basic Junos knowledge and moves into intermediate switching, routing, policy, security, and troubleshooting.
Does the exam focus more on routing or switching?
It covers both. Three areas address Layer 2 switching and security, while the remaining areas cover routing, tunnels, and availability. Juniper does not publish percentages, so no domain should be treated as optional.
Do I need hands-on Junos practice?
Hands-on work is strongly useful because many objectives include configuration, monitoring, and troubleshooting. A lab makes it easier to connect protocol theory with Junos output.
Should I memorize every Junos command?
No. Focus on common configuration structure and the commands that verify interfaces, VLANs, spanning tree, routes, neighbors, policies, tunnels, and availability state.
Which official training does Juniper recommend?
The official page lists Junos Intermediate Routing and Junos Enterprise Switching. Practice exams, preparation webinars, and other resources are also recommended, but they do not guarantee a passing result.
How should I use the sample questions?
Use them to check topic coverage and reasoning. For each missed question, reproduce the configuration or inspect the related operational output in a lab before moving on.
Prepare with JN0-352 Study Materials
CertQueen JN0-352 preparation materials follow the nine official JNCIS-ENT exam areas and provide practice with Junos switching, routing, security, tunneling, and high-availability scenarios.
- Coverage of all nine official exam areas
- Practice with configuration, monitoring, and troubleshooting decisions
- Review based on the Junos 23.1 exam baseline
- PDF and practice-software options where listed on the product page
- 12 months of free content updates, with an optional upgrade to 24 months for $10
The standard package includes 12 months of free content updates from the purchase date. Customers can extend the update period to 24 months for an additional $10.
Start Your JN0-352 Exam Preparation
Disclaimer
CertQueen is an independent exam-preparation provider and is not affiliated with or endorsed by Juniper Networks. Exam details and policies can change. Juniper, Junos, certification names, exam codes, and related trademarks belong to their respective owners.