- Exam Snapshot: The Numbers You Need
- The Seven Domains, Distilled
- Domain 1: Networking Fundamentals Cheat Notes
- Domain 2: Junos OS Fundamentals Cheat Notes
- Domain 3: User Interfaces Cheat Notes
- Domain 4: Configuration Basics Cheat Notes
- Domain 5: Operational Monitoring and Maintenance Cheat Notes
- Domain 6: Routing Fundamentals Cheat Notes
- Domain 7: Routing Policy and Firewall Filters Cheat Notes
- Command and Mode Quick Reference
- The One-Week Countdown Plan
- Exam-Day Logistics Cheat Sheet
- FAQ
- JN0-106 has 65 multiple-choice questions, runs 90 minutes, and costs $200 through Pearson VUE.
- JN0-106 replaced JN0-105 on April 6, 2026 and maps to Junos OS 21.2 - confirm you're studying the right version.
- No prerequisite is required, and the credential stays valid for three years before recertification.
- Seven domains matter equally in prep time: don't over-index on routing and skip User Interfaces or Configuration Basics.
Exam Snapshot: The Numbers You Need
Before diving into content review, lock in the mechanics of the exam itself. These are the facts that trip up candidates who studied the technology but never checked the logistics.
| Detail | Value |
|---|---|
| Exam code | JN0-106 |
| Administered by | Pearson VUE (test center or OnVUE online proctoring) |
| Cost | $200 USD |
| Questions | 65, multiple-choice |
| Time limit | 90 minutes |
| Language | English |
| Results | Pass/fail reported immediately |
| Prerequisite | None |
| Software base | Junos OS 21.2 |
| Validity | 3 years |
JN0-106 replaced the older JN0-105 exam on April 6, 2026, so any study material referencing JN0-105 objectives or an earlier Junos build is outdated. If you want the full breakdown of exam fees, retake costs, and what's bundled with training, the JNCIA-Junos Certification Cost 2026 pricing breakdown covers it in detail. And if you're unsure whether you meet eligibility criteria before registering, check the JNCIA-Junos Requirements guide - spoiler: there isn't a formal prerequisite, but background knowledge still matters.
The Seven Domains, Distilled
Juniper organizes JN0-106 into seven domains. None of them is a throwaway - questions are pulled from all seven, and skipping one because it "feels minor" is a common reason candidates fall short. For a deep dive into each domain's weight and subtopics, see the JNCIA-Junos Exam Domains complete guide to all 7 content areas. This cheat sheet gives you the condensed, exam-morning version.
- Networking Fundamentals
- Junos OS Fundamentals
- User Interfaces
- Configuration Basics
- Operational Monitoring and Maintenance
- Routing Fundamentals
- Routing Policy and Firewall Filters
Domain 1: Networking Fundamentals Cheat Notes
Networking Fundamentals
This domain checks whether you understand core networking concepts independent of Junos - the OSI model, addressing, and basic protocol behavior that every device on a network relies on.
- OSI model layers and what happens at each one
- IPv4 addressing, subnetting, and CIDR notation
- Encapsulation and de-encapsulation concepts
- Basic switching concepts: collision domains, broadcast domains, MAC address learning
- Basic routing concepts: how a router selects a next hop
If networking theory feels shaky, don't skip straight to Junos commands. A weak grasp of subnetting or the OSI model will cost you points on questions that never mention the word "Junos" at all.
Domain 2: Junos OS Fundamentals Cheat Notes
Junos OS Fundamentals
This is where Junos-specific architecture enters the picture - the software design that separates it from other vendor operating systems.
- Separation of the control plane and forwarding plane
- Routing Engine (RE) vs. Packet Forwarding Engine (PFE) roles
- The single, hierarchical configuration structure shared across platforms
- Junos releases and how software versioning works
- High availability concepts: graceful restart, redundant REs on supported platforms
Understanding why Junos uses one unified configuration syntax across routers, switches, and firewalls is a recurring theme - expect questions that test conceptual understanding, not just memorized syntax.
Domain 3: User Interfaces Cheat Notes
User Interfaces
Junos gives you multiple ways to interact with the device. This domain confirms you know when and how to use each one.
- CLI operational mode vs. configuration mode - what each allows
- J-Web graphical interface basics
- CLI navigation: command completion, contextual help (?), pipe (|) filtering
- Keyboard shortcuts and command history
- Logging in via console, Telnet, SSH
Key Takeaway
Memorize the difference between operational mode commands (show, ping, traceroute) and configuration mode commands (set, delete, edit). Exam questions often present a CLI prompt and ask what mode you're in or what command would work next.
Domain 4: Configuration Basics Cheat Notes
Configuration Basics
This domain tests your ability to actually build and manage a configuration, not just read one.
- Candidate configuration vs. active configuration
- commit, commit confirmed, and rollback behavior
- set, delete, rename, copy, and insert commands
- Configuration groups and the apply-groups statement
- Loading configurations: load merge, load override, load replace
- Annotating configuration with comments
Candidates frequently underestimate how many questions revolve around commit behavior - especially the safety net that commit confirmed provides if a change locks you out of a device. Know what happens if you don't confirm within the timeout window.
Domain 5: Operational Monitoring and Maintenance Cheat Notes
Operational Monitoring and Maintenance
Once a device is configured, you need to verify it's working and troubleshoot when it isn't.
- show commands for interfaces, routes, and system status
- monitor commands for real-time traffic and log viewing
- System log (syslog) basics and severity levels
- File system management: storage, cleanup, request commands
- Software upgrade process fundamentals
This domain rewards hands-on familiarity more than memorization. If you've never actually run show interfaces terse or show route on a live or virtual Junos device, that gap will show up on exam day.
Domain 6: Routing Fundamentals Cheat Notes
Routing Fundamentals
This domain is heavier on protocol knowledge and is often where candidates spend the most study time - for good reason.
- Static routing configuration and use cases
- Dynamic routing protocol basics: OSPF, RIP, BGP concepts
- Routing tables and the forwarding table relationship
- Route preference (administrative distance equivalent in Junos)
- Load balancing and equal-cost multipath basics
You don't need to be a BGP expert for JN0-106, but you should know each protocol's basic purpose, how routes are selected, and how Junos decides which route wins when multiple protocols advertise the same destination.
Domain 7: Routing Policy and Firewall Filters Cheat Notes
Routing Policy and Firewall Filters
The final domain covers how traffic is controlled and manipulated as it moves through a Junos device.
- Routing policy structure: from, then, and term statements
- Policy application points: import vs. export
- Firewall filter syntax and match conditions
- Filter application to interfaces and the difference between input and output filters
- Default policy behavior when no explicit policy matches
Expect scenario-based questions here: given a policy snippet, what traffic gets permitted, denied, or modified? Practice reading policy terms top-to-bottom, since Junos evaluates them in order and stops at first match.
Command and Mode Quick Reference
Keep this mental map handy while reviewing:
- Operational mode: show, monitor, ping, traceroute, request, file
- Configuration mode: set, delete, edit, top, exit, show (configuration view), commit, rollback
- Moving between modes: configure enters configuration mode; exit or commit-related actions return you to operational mode
- Committing changes: commit, commit confirmed [minutes], commit check (validates without applying)
- Undoing changes: rollback 0 through rollback 49 for stored configuration versions
The One-Week Countdown Plan
If you've already done your primary studying - ideally following the structured approach in the JNCIA-Junos Study Guide on how to pass on your first attempt - use this final week to consolidate rather than learn new material.
Networking Fundamentals + Junos OS Fundamentals
- Re-read OSI layer functions and subnetting math
- Review control plane/forwarding plane separation
User Interfaces + Configuration Basics
- Practice commit, commit confirmed, and rollback sequences on a virtual device
- Drill CLI mode transitions
Operational Monitoring + Routing Fundamentals
- Run and interpret show route, show interfaces terse
- Review OSPF/RIP/BGP basics and route preference
Routing Policy and Firewall Filters + Full Review
- Practice reading policy terms in order
- Take a full-length timed practice exam on the JNCIA-Junos practice test platform
Scheduling routing-heavy domains mid-week gives you two extra days to reinforce protocol concepts before the exam, while lighter domains like User Interfaces get reviewed early when retention is easiest to test with flashcards.
Exam-Day Logistics Cheat Sheet
Don't let logistics cost you points you've already earned through study. Confirm these before your appointment:
- Format choice: decide between an in-person Pearson VUE test center and OnVUE online proctoring - check your ID and workspace requirements in advance if testing from home
- Timing: 90 minutes for 65 questions gives you roughly 80 seconds per question on average; don't linger on any single item
- Results: pass/fail is shown immediately after you finish, so you'll know your outcome before leaving the testing session
- Recertification: the credential is valid for three years; recertify by completing an approved Juniper course such as Introduction to the Junos Operating System or a higher-level course in the same track
Curious whether the exam's difficulty matches its reputation, or how the pass/fail scoring threshold actually works? Read the JNCIA-Junos Exam Difficulty Guide and the JNCIA-Junos Passing Score guide on exactly what you need to pass for specifics beyond what fits on this one-page sheet. If you want context on how JN0-106 compares against historical outcomes, the JNCIA-Junos Pass Rate data breakdown is a useful companion read.
Frequently Asked Questions
No. This page is a compact review tool for final-week reinforcement, not a substitute for full study. Pair it with hands-on CLI practice and a complete run-through of all seven domains before your exam date.
JN0-106 replaced JN0-105 on April 6, 2026 and is based on Junos OS 21.2. If you're using older study material, verify it reflects the current exam code and software version before relying on it.
There is no prerequisite certification required for JN0-106. Many candidates still benefit from hands-on lab time or an introductory Junos course before attempting the exam.
Yes. In addition to physical Pearson VUE testing centers, the exam is available through OnVUE online proctoring, which lets you test remotely under monitored conditions.
Pass/fail status is reported immediately after you complete the exam, so you won't have to wait days for a score report.
Keep this page bookmarked as your final-review companion, and revisit the domain-specific breakdown or full study guide whenever you need to go deeper than a one-page summary allows. When you're ready to test your recall under real exam conditions, head to the JNCIA-Junos practice test hub and run a timed simulation before booking your Pearson VUE session.