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JN0-105: What the Retired JNCIA-Junos Exam Covered and What Replaced It

JN0-105 was the Juniper Networks Certified Associate, Junos exam used from January 2024 until 5 April 2026. It is now retired. Juniper announced that JN0-105 would reach end of life on 5 April 2026 and that JN0-106 would become the new JNCIA-Junos exam on 6 April 2026. Candidates preparing today should therefore use the live JN0-106 blueprint rather than treating JN0-105 as a schedulable test.

The credential behind the code remains JNCIA-Junos. It is Juniper's foundational certification for networking professionals who need working knowledge of Junos OS and basic networking. JN0-105 tested networking fundamentals, Junos architecture, interfaces, configuration, monitoring and maintenance, routing fundamentals, routing policy, and firewall filters.

Understanding JN0-105 is still useful because it is recent enough that many training courses, books, videos, and employer records reference it. The key is to separate historical study value from current exam status. An old resource can explain Junos well without being the correct authority for the exam a candidate can book in October 2026.

JN0-105 restored broad networking fundamentals to the associate blueprint

The JN0-105 objectives included core networking concepts such as collision and broadcast domains, the functions of routers and switches, Ethernet, Layer 2 addressing, IPv4 and IPv6 addressing, subnetting, longest-prefix matching, class of service, and connection-oriented versus connectionless protocols.

This foundation matters because Junos configuration only makes sense when the candidate understands the traffic behavior being configured. An interface address is not simply a command to memorize; it defines reachability within a subnet. A route is not simply a line of configuration; it participates in a forwarding decision based on destination, preference, and longest match.

Candidates who struggled with subnetting often found later routing questions harder because the network logic remained unclear. Supporting study on IPv4 subnetting can therefore be useful even though the certification itself is Juniper-specific.

Junos OS architecture explains why the platform behaves the way it does

JN0-105 expected candidates to understand the separation between the Routing Engine and Packet Forwarding Engine, the distinction between control and forwarding planes, and the difference between transit and exception traffic. These are foundational ideas for both operation and troubleshooting.

The Routing Engine maintains routing and system-control information, while the forwarding plane uses programmed information to move packets. This separation helps explain why an administrator can have a route in the routing table but still need to consider forwarding state, interfaces, filters, and next-hop reachability when traffic does not behave as expected.

Architecture questions are best studied through cause and effect. Instead of memorizing component names, ask which component makes a decision, which one forwards the packet, and what kind of traffic needs control-plane attention.

The CLI and configuration model reward hands-on practice

Junos uses operational and configuration modes with a hierarchical configuration structure. JN0-105 tested navigation, help, output filtering, candidate versus active configuration, file management, comparisons, and rollback behavior.

The candidate configuration is especially important. Changes can be staged, reviewed, validated, and then committed. This supports safer administration because a set of edits can be treated as one controlled change rather than becoming active line by line.

Lab practice should include making an intentional change, using comparison commands, committing it, observing the active state, and then using rollback. That sequence builds a practical understanding that is more durable than memorizing command descriptions.

Configuration basics connect the operating system to a manageable device

The exam covered initial configuration topics such as user accounts, login classes, authentication methods, interface properties, configuration groups, NTP, SNMP, syslog, archiving, logging, tracing, and rescue configuration. The aim was to ensure that the candidate could reason about the basic administrative state of a Junos device.

These tasks often interact. Logging is more useful when timestamps are accurate. Remote management depends on authentication and reachable interfaces. A rescue configuration is valuable only if the administrator understands when and how it can support recovery.

The best study method is to build a small baseline configuration from a factory-default state and explain why each element exists. This exposes gaps that multiple-choice review can hide.

Operational monitoring and maintenance turn configuration into supportable operations

JN0-105 required familiarity with show and monitor commands, interface statistics, errors, network tools, software installation and upgrades, shutdown procedures, and root-password recovery. These objectives reflect the fact that administrators spend significant time observing and maintaining systems, not just configuring them.

Tools such as ping and traceroute provide evidence about reachability and path behavior. Interface counters can reveal errors or unexpected traffic. Logs can show when state changed. The candidate should know which source of evidence is appropriate to the symptom rather than running commands at random.

Maintenance topics also connect to change control. Software upgrades and recovery actions can affect service availability, so competent administration includes planning, validation, fallback, and awareness of the device's operational state.

Routing fundamentals cover how Junos learns and selects paths

The routing section addressed routing tables, forwarding tables, route preference, routing instances, static routes, traffic-forwarding concepts, and the reasons organizations use dynamic routing protocols. JN0-105 remained an associate-level exam, so the objective was to establish sound routing logic rather than deep protocol specialization.

Candidates should be able to distinguish route presence from route preference and forwarding. A device may know several possible routes and select one according to preference and route-selection rules. The forwarding table is then used for packet handling, which means troubleshooting should follow the path from learned information to selected route to actual forwarding state.

This foundation supports later Juniper tracks where routing protocols, MPLS, enterprise switching, or service-provider technologies receive much greater depth.

Routing policy and firewall filters use similar structures for different purposes

Routing policy controls routing information. Import and export policies can accept, reject, or modify routes based on match conditions and actions. Policy terms create ordered logic, and the candidate needs to understand how policy evaluation changes routing behavior.

Firewall filters instead classify packets and apply actions to traffic. They can permit, discard, count, police, or otherwise handle packets based on fields and conditions. Although both features use terms, matches, and actions, one operates on routing information while the other operates on packets.

That distinction is an exam favorite because the syntax patterns can feel similar. A useful preparation habit is to ask, “Am I controlling routes or traffic?” before deciding which mechanism applies.

JN0-105 sat between earlier JNCIA-Junos exams and the current JN0-106

JN0-105 replaced JN0-104 in January 2024. Earlier in the lineage, JN0-103 had served as the associate exam after JN0-102. Each code represented a specific assessment version while the underlying credential remained JNCIA-Junos.

Juniper's current JN0-106 exam is delivered by Pearson VUE, allows 90 minutes, contains 65 multiple-choice questions, has no prerequisite certification, and is based on Junos OS 21.2 according to the live Juniper certification page. The present objectives remain broadly familiar to someone who studied JN0-105.

That continuity does not make the exams interchangeable. Juniper can update wording, software references, emphasis, and question pools. Current candidates should use the live objectives and recommended training even when older JN0-105 material remains technically useful.

The certification is a foundation for Juniper routing and switching careers

The JNCIA-Junos certification establishes a common Junos baseline for professionals who may later move into enterprise routing and switching or service-provider routing and switching. It is designed for beginner-to-intermediate networking knowledge rather than expert specialization.

The wider Juniper certification portfolio builds on operating-system familiarity because specialist engineers still need to configure, monitor, and troubleshoot Junos devices confidently. The associate level provides that common language before deeper track-specific work.

Juniper certification pathways connect associate-level Junos skills with more specialized networking and security tracks, while the current Juniper Learning Portal should remain the authority for live exam requirements.

Because JN0-105 retired only in April 2026, much of its technical content still overlaps with the current associate-level foundation. Junos fundamentals and JN0-105 material can still reinforce architecture, CLI, configuration, routing, and policy concepts.

However, candidates should annotate every older resource with its version. When a topic conflicts with the current JN0-106 blueprint, the current objective wins. When software examples differ, candidates should understand the concept first and then practice it on an appropriate current Junos environment.

A useful lab sequence is to configure basic system identity and interfaces, validate addressing, inspect routing and forwarding tables, create a static route, test reachability, apply a simple routing policy, build a firewall filter, generate traffic, and verify the result. This connects multiple domains into one coherent operating exercise.

Exam retirement also changes how practice questions should be evaluated. A JN0-105 question can still be technically useful when it tests a stable Junos concept, but it should not be treated as evidence of what appears on JN0-106. Candidates should map older exercises to the live objective domains and discard version-specific assumptions that no longer fit. This keeps recent historical material useful without confusing familiarity with current exam coverage.

The same principle applies to lab notes: retain commands and troubleshooting methods that still behave as expected, but validate software-specific behavior against the Junos release and documentation used for current preparation.

The most important update is simple: JN0-105 cannot be the target exam anymore

Juniper's certification news is explicit: JN0-105 reached end of life on 5 April 2026. The current JNCIA-Junos exam is JN0-106. A page that still says “prepare to take JN0-105” is therefore outdated even if the technical explanations are otherwise accurate.

For holders who passed JN0-105 before retirement, the exam code remains part of their certification history. Juniper certifications are generally valid for three years from the date earned or recertified, so exam retirement and credential validity are separate issues.

For new candidates, start with the current exam code, objectives, and Juniper training. Use JN0-105 as recent historical context and supplementary technical study only. The certification goal is current JNCIA-Junos competence, not preserving a retired exam version.

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