1500 Questions | JNCIA-Junos (JN0-104) Masterclass 2026

Detailed Exam Domain CoverageTo succeed in the JNCIA-Junos certification, you must demonstrate proficiency in the core architecture and operational efficiency of Junos OS. These practice tests are meticulously designed to cover the official Juniper Networks Certified Associate, Junos (JNCIA-Junos) exam domains:Junos OS Basics (20%): Mastering the Junos architecture, understanding the separation of the Control Plane and Forwarding Plane, and navigating the CLI with operational and configuration modes. Junos Operation and Maintenance (20%): Learning how to monitor device health, verify interface status, and manage configuration rollbacks and rescue configurations.

Network Design and Implementation (30%): Planning network layouts and understanding how Junos OS functions within complex service provider and enterprise environments. Network Services (30%): Configuring and verifying essential protocols and services, including routing fundamentals, routing policy, and firewall filters. Course DescriptionI have spent extensive time curating this test bank to ensure it reflects the actual rigor of the Juniper Networks Certified Associate, Junos (JNCIA-Junos) exam, I know that transitioning from other vendors to Junos requires a shift in mindset, particularly regarding the candidate-commit configuration model, I built these 1,500 practice questions to provide you with the hands-on logic needed to pass on your very first attempt,Every question in this simulator includes a detailed breakdown of the logic behind the Junos CLI, I don't just tell you which command is right; I explain why the others would fail or produce different results in a live environment, This depth of explanation turns a simple practice test into a powerful study tool,Sample Practice QuestionsQuestion 1: Which command is used to move from operational mode to configuration mode in the Junos CLI?

A. enableB. configureC.

edit modeD. set systemE. run configureF.

commitCorrect Answer: BExplanation:B (Correct): In Junos, "configure" is the standard command to enter the configuration mode where changes are made to the candidate configuration,A (Incorrect): This is a Cisco IOS command; Junos does not use "enable" to enter configuration mode,C (Incorrect): While "edit" is used within configuration mode to navigate levels, it is not the command to enter the mode itself,D (Incorrect): "set" is used to modify specific hierarchy levels once already in configuration mode,E (Incorrect): The "run" prefix is used to execute operational commands while inside configuration mode, not the other way around,F (Incorrect): "commit" is used to apply changes, not to enter the mode where changes are written,Question 2: What happens to the candidate configuration when the "rollback 0" command is issued? A. The device reboots and loads the factory default settings,B.

All changes made in the current session are discarded, and the candidate is reset to the active configuration,C. The rescue configuration is immediately applied to the data plane,D. The configuration is saved but not applied to the hardware,E.

The last 50 commits are deleted from the system storage,F. The device switches to the backup Routing Engine,Correct Answer: BExplanation:B (Correct): "rollback 0" returns the candidate configuration to the state of the currently active (running) configuration, effectively clearing uncommitted changes,A (Incorrect): To reach factory defaults, a specific "load factory-default" command is required,C (Incorrect): The rescue configuration is a specifically saved state, not the "0" index of rollbacks,D (Incorrect): This describes the state of the candidate configuration before a rollback,E (Incorrect): Rollback only affects the current candidate buffer; it does not delete the history of previous commits,F (Incorrect): Rollback is a software configuration management tool and does not trigger hardware failover,Question 3: In the Junos OS, which plane is responsible for processing protocol updates and managing the routing table? A.

Data PlaneB. Forwarding PlaneC. Control PlaneD.

Services PlaneE. Management PlaneF. BackplaneCorrect Answer: CExplanation:C (Correct): The Control Plane (running on the Routing Engine) handles all routing protocols, system management, and the construction of the routing table,A (Incorrect): The Data Plane (or Forwarding Plane) is responsible only for the high-speed transit of packets based on the forwarding table,B (Incorrect): This is another name for the Data Plane, which does not process protocol updates,D (Incorrect): The Services Plane handles specific tasks like encryption or NAT, not general routing logic,E (Incorrect): While related, the Management Plane is specifically for user access (SSH/SNMP), while the Control Plane handles the "intelligence" of the network,F (Incorrect): The backplane is the physical connectivity between components, not a logical processing plane,Welcome to the Exams Practice Tests Academy to help you prepare for your Juniper Networks Certified Associate, Junos (JNCIA-Junos).

You can retake the exams as many times as you wantThis is a huge original question bankYou get support from instructors if you have questionsEach question has a detailed explanationMobile-compatible with the Udemy app30-days money-back guarantee if you're not satisfiedI hope that by now you're convinced!