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Exam Information
Official specifications published by Juniper
Exam Format
Registration
Validity
Skills this practice test covers
- Subnet IPv4 networks and pick the route that longest match routing selects.
- Trace transit and exception traffic through the Routing Engine and the Packet Forwarding Engine.
- Edit a candidate configuration, compare it, then commit it or roll it back.
- Set up user accounts, login classes, interfaces and NTP on a new device.
- Recover a lost root password and upgrade Junos OS.
- Write routing policies and firewall filters from terms, match conditions and actions.
Explore related topics
JN0-106 exam content
7 domains · 45 topics · 150 of 360 questions are written for JN0-106
Networking Fundamentals22 questions
This domain checks the networking that all Junos work rests on. Candidates explain collision and broadcast domains, Ethernet and address resolution, and IPv4 and IPv6 addressing, including subnetting and supernetting.
Skills tested
- Separate collision domains from broadcast domains and name the devices that bound each one.
- Explain how address resolution maps an IP address to a MAC address on Ethernet.
- Subnet and supernet IPv4 networks, and convert decimal values to binary.
- Pick the route that longest match routing selects for a destination.
- Compare connection-oriented and connectionless protocols.
Questions by topic
- Collision domains and broadcast domains3
- Subnetting and supernetting4
- Layer 2 addressing, including address resolution3
- Longest match routing3
- Connection-oriented vs. connectionless protocols3
- Decimal to binary conversion2
- Ethernet networks2
- IPv4 /IPv62
Junos OS Fundamentals21 questions
This domain is about how Junos OS is built. The Routing Engine runs the control plane and the Packet Forwarding Engine runs the forwarding plane. Transit traffic stays in the Packet Forwarding Engine, while exception traffic goes up to the Routing Engine.
Skills tested
- Describe the Junos software architecture.
- Explain why Junos separates the control plane from the forwarding plane.
- Assign each task to the Routing Engine or the Packet Forwarding Engine.
- Tell transit traffic from exception traffic and trace how each one is handled.
Questions by topic
- Control and forwarding planes3
- Exception traffic6
- Transit traffic processing3
- Software architecture5
- Routing engine and packet-forwarding engine4
User Interfaces22 questions
This domain covers the Junos CLI and J-Web. Candidates move between operational mode and configuration mode, use CLI help and output filters, and manage the candidate and active configurations.
Skills tested
- Switch between operational mode and configuration mode and move through the configuration hierarchy.
- Filter long command output with the pipe.
- Compare the candidate configuration with the active one by using show | compare.
- Return to an earlier configuration with rollback.
- Save, load and compare configuration files.
Questions by topic
- CLI modes2
- Active vs. candidate configuration4
- Modifying, managing, and saving configuration files2
- Filtering output3
- Reverting to previous configurations3
- CLI Help3
- CLI navigation2
- Viewing, comparing, and loading configuration files2
- J-Web (core/common functionality only)1
Configuration Basics21 questions
This domain starts from a device in its factory-default state and builds its first configuration. It covers user accounts, login classes, authentication, interfaces, configuration groups and services such as NTP, SNMP and system logging.
Skills tested
- Bring a device from its factory-default state to a working initial configuration.
- Create user accounts and control their rights with login classes.
- Configure interfaces and their logical units.
- Reuse settings with configuration groups and apply-groups.
- Save a rescue configuration that restores a known-good state.
Questions by topic
- Login classes3
- Configuration groups4
- Rescue configuration3
- Additional initial configuration elements, such as Network Time Protocol (NTP), SNMP, system log3
- Interface types and properties4
- Initial configuration3
- User authentication methods1
Operational Monitoring and Maintenance20 questions
This domain is the daily care of a running device. Candidates read show and monitor command output, check interface statistics and errors, upgrade Junos OS and recover a lost root password.
Skills tested
- Check device and interface health with show and monitor commands.
- Find interface errors in the interface statistics.
- Test reachability with ping and traceroute.
- Install or upgrade Junos OS, and power a device off safely.
- Recover the root password on a Junos device.
Questions by topic
- Root password recovery4
- Monitor commands4
- Junos OS installation and upgrades4
- Powering on and shutting down Junos devices3
- Interface statistics and errors3
- Network tools, such as ping, traceroute, telnet, SSH, etc.2
Routing Fundamentals21 questions
This domain explains how a Junos device decides where to send traffic. Candidates compare the routing table with the forwarding table, rank routes by route preference, configure static routes and explain when dynamic routing protocols help.
Skills tested
- Read the inet.0 routing table and explain how it feeds the forwarding table.
- Predict which route wins on route preference.
- Configure static routes and check them in the routing table.
- Keep routing tables apart with routing instances.
- Explain the use cases for dynamic routing protocols such as OSPF and BGP.
Official topics
- Basic routing on Junos devices
Routing Policy and Firewall Filters23 questions
This domain has two parts. Routing policy controls which routes enter the routing table and which routes a protocol advertises. Firewall filters act on packets, with terms that match traffic and actions such as accept, discard and count.
Skills tested
- Explain what the default routing policy of each protocol does.
- Write import and export policies with terms, match criteria and actions.
- Follow the routing policy flow when several policies apply.
- Build a stateless firewall filter that accepts, discards or counts packets.
- Explain how unicast RPF drops packets with spoofed source addresses.
Questions by topic
- Default routing policies4
- Policy match criteria, match types, and actions3
- Effect of filters on packets3
- Unicast reverse-path-forwarding (RPF)4
- Policy structure and terms2
- Filter match criteria and actions2
- Import and export policies2
- Filter structure and terms1
- Firewall filter concepts2
Requirements
- No formal prerequisites: anyone can book the exam.
- Recommended: beginner to intermediate networking knowledge.
- Recommended: some working knowledge of Junos OS before the exam.
About the JN0-106 exam
JN0-106 tests whether a candidate understands Junos OS well enough to configure, monitor and maintain a Juniper device from the command line. Juniper aims it at networking professionals with beginner to intermediate knowledge, and it has no prerequisites. Its seven objectives run from subnetting and the split between the Routing Engine and the Packet Forwarding Engine to routing policy and firewall filters. Passing earns the Juniper Networks Certified Associate, Junos (JNCIA-Junos) certification.
Juniper publishes no weights for the seven objectives, and the PlanetCert practice test spreads its questions about evenly across them. The explanations show how Junos treats each case, such as why a firewall filter term without match conditions matches every packet. Study Mode suits the CLI and configuration questions, where each command deserves a careful read. Brainy AI Assistant can explain why one route beats another on route preference, or what an export policy does to the routes it matches.
How to earn the certification
- Earns
- Juniper Networks Certified Associate, Junos (JNCIA-Junos)Associate
JNCIA-Junos is valid for three years. Holders renew it by passing the current JNCIA-Junos exam again or a Specialist-level exam in a track.
- After
- JN0-364 Service Provider Routing and Switching, Specialist (JNCIS-SP)
The specialist exam of the Service Provider Routing and Switching track, which starts from JNCIA-Junos.
- JN0-364 Service Provider Routing and Switching, Specialist (JNCIS-SP)
How to prepare for JN0-106
- 1
Work on a lab Junos device
Use a lab device or a virtual Junos device for every CLI task in the objectives. Commands such as commit, rollback and show | compare are easier to remember once they have been typed.
- 2
Rehearse the commit cycle
Edit the candidate configuration, review it with show | compare, commit it, then roll it back. Save a rescue configuration and load it again.
- 3
Subnet on paper every day
Networking Fundamentals asks for subnetting, supernetting and binary conversion. Work a few problems by hand each day until they feel routine.
- 4
Trace traffic through the device
Draw how transit traffic stays in the Packet Forwarding Engine while exception traffic goes to the Routing Engine. Then read the routing and forwarding tables on the lab device.
- 5
Drill policies before a timed run
Policy and filter questions combine many small rules, so work them in Study Mode first. Then take the full JN0-106 practice test in Timed Mode and ask Brainy AI Assistant about any result that was unexpected.
Start a timed JN0-106run
Juniper recommends the Getting Started with Networking and Introduction to the Junos Operating System courses.
Who JN0-106 is for
- Network engineers who are moving from another vendor's equipment to Junos OS.
- Networking students who want an associate certification that several Juniper tracks build on.
- Engineers who plan to continue to JNCIS-SP in the Service Provider Routing and Switching track.
Typical job titles: Network engineer · Network administrator · NOC technician · Network support engineer · Junior network engineer
JN0-106 glossary
20 terms from the exam objectives and the vendor's official material, each defined in a sentence.
- Active configuration
- The configuration that the device runs now. A successful commit replaces it with the candidate configuration.
- Candidate configuration
- The working copy of the configuration that changes as a user edits it. It takes effect only after a commit.
- commit
- The command that checks the candidate configuration and, if it is valid, makes it the active configuration.
- Configuration groups
- Reusable blocks of configuration that other parts of the hierarchy inherit through the apply-groups statement.
- Exception traffic
- Traffic that the Packet Forwarding Engine cannot forward by itself, such as packets addressed to the device, so it sends them to the Routing Engine.
- Export policy
- A routing policy that controls which routes from the routing table a protocol advertises to its neighbors.
- Import policy
- A routing policy that controls which routes a protocol places in the routing table.
- inet.0
- The default Junos routing table for IPv4 unicast routes.
- Login classes
- Named sets of permissions that decide which commands a user account may run.
- Longest prefix match
- The rule that a router forwards traffic by the most specific route that matches the destination address.
- Packet Forwarding Engine (PFE)
- The forwarding plane part of a Junos device. It moves transit traffic through the device by using the forwarding table.
- Rescue configuration
- A known-good configuration that an administrator saves on purpose, so that the device can return to it after a mistake.
- rollback
- The command that loads an earlier saved configuration into the candidate configuration, ready to commit again.
- Route preference
- The Junos value that ranks routes to the same destination from different sources. The route with the lowest value is used.
- Routing Engine (RE)
- The control plane part of a Junos device. It runs the routing protocols, builds the routing table and runs the CLI.
- Routing instances
- Separate sets of routing tables and interfaces inside one Junos device, each working like a router of its own.
- show | compare
- A configuration mode command that lists the differences between the candidate configuration and the active configuration.
- Stateless firewall filters
- Junos filters that check each packet on its own against the match conditions in their terms, then take an action such as accept, discard or count.
- Transit traffic
- Traffic that passes through the device on its way to another destination. The Packet Forwarding Engine handles it.
- uRPF
- Unicast reverse-path forwarding: a check that drops a packet when its source address is not reachable through the interface on which it arrived.