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Back to JN0-105 Exam

To excel in the JN0-105 (JNCIA-Junos) certification exam, it is essential to align your study methods with the exam's content and objectives. Below are tailored learning strategies and exam tips specifically for JN0-105 topics.

Learning Methods for JN0-105

1. Networking Fundamentals

Key Topics:

  • OSI and TCP/IP models, MAC vs. IP addresses, collision and broadcast domains, static and dynamic routing.

Study Methods:

  1. Visualize Concepts:

    • Use diagrams to understand how packets move across the OSI model layers.
    • Draw collision and broadcast domain diagrams showing how routers and switches affect them.

  2. Build Hands-On Experience:

    • Use a lab environment to simulate static routing setups.
    • Configure basic IP addressing on interfaces and test connectivity with ping.

  3. Practice Repeatedly:

    • Memorize layer functions using mnemonics (e.g., OSI: "Please Do Not Throw Sausage Pizza Away").
    • Use flashcards to match protocols (e.g., TCP, UDP, HTTP) with the correct OSI layer.

  4. Quiz Yourself on Fundamentals:

    • Take quizzes to reinforce concepts like the differences between MAC and IP addressing, the role of routers, and when to use static vs. dynamic routing.

2. Junos OS Fundamentals

Key Topics:

  • Control and forwarding planes, candidate vs. active configurations, modular design.

Study Methods:

  1. Understand the Architecture:

    • Watch videos or animations that show the separation of the control plane and forwarding plane in action.
    • Memorize the roles of the Routing Engine (RE) and Packet Forwarding Engine (PFE).

  2. Simulate Configurations:

    • Practice switching between candidate and active configurations in a virtual lab:

      set system host-name MyRouter
commit
rollback 0

    • Experiment with configuration errors and learn to use rollback commands to recover.

  3. Study Modular Design Benefits:

    • Understand how Junos updates or isolates individual software modules for reliability.
    • Use a lab or simulator to practice upgrading modules independently.

3. User Interfaces

Key Topics:

  • CLI and J-Web, operational and configuration modes.

Study Methods:

  1. Master the CLI:

    • Practice key commands in both operational and configuration modes:
      • show for diagnostics (e.g., show interfaces terse).
      • set, delete, and commit for making changes.
    • Use context-sensitive help (?) and autocompletion (Tab) to explore command options.

  2. Familiarize with J-Web:

    • Use the J-Web interface to complete tasks like monitoring interfaces, configuring IPs, and checking logs.
    • Compare CLI and J-Web approaches to the same task (e.g., configuring a hostname).

  3. Scenario-Based Practice:

    • Solve practical scenarios, such as viewing interface statuses or diagnosing traffic issues using show commands.

4. Configuration Basics

Key Topics:

  • Setting hostnames, creating user accounts, configuring interfaces, saving/restoring configurations.

Study Methods:

  1. Practice Initial Configuration:

    • Set up basic configurations repeatedly in a lab or simulator:

      set system host-name MyRouter
set interfaces ge-0/0/0 unit 0 family inet address 192.168.1.1/24
commit

  2. Learn Backup and Restore:

    • Practice saving configurations to files and restoring them:

      save config backup.conf
load override backup.conf

  3. Quiz Yourself:

    • Use flashcards or a CLI simulator to test your ability to configure devices from scratch.

5. Routing Fundamentals

Key Topics:

  • Routing table vs. forwarding table, static vs. dynamic routing, OSPF, BGP.

Study Methods:

  1. Hands-On Static Routing:

    • Practice configuring static routes in a simulator:

      set routing-options static route 192.168.2.0/24 next-hop 192.168.1.254

  2. Understand OSPF and BGP Concepts:

    • Watch tutorials on OSPF’s link-state mechanism and BGP’s role in inter-AS routing.
    • Use flashcards to memorize OSPF and BGP attributes like areas (OSPF) and AS paths (BGP).

  3. Simulate Routing Scenarios:

    • Use a lab to create OSPF areas or set up a basic BGP peering relationship.

6. Routing Policies and Firewall Filters

Key Topics:

  • Routing policy behavior, firewall filter configuration.

Study Methods:

  1. Configure Routing Policies:

    • Practice creating policies to filter specific routes:

      set policy-options policy-statement IMPORT_POLICY term 1 from protocol bgp
set policy-options policy-statement IMPORT_POLICY term 1 then accept

  2. Simulate Firewall Filters:

    • Write and apply filters to control traffic:

      set firewall family inet filter TEST_FILTER term ALLOW_HTTP from protocol tcp
set firewall family inet filter TEST_FILTER term ALLOW_HTTP from destination-port 80
set firewall family inet filter TEST_FILTER term ALLOW_HTTP then accept
set interfaces ge-0/0/0 unit 0 family inet filter input TEST_FILTER

  3. Solve Scenarios:

    • Answer scenario-based questions like "How would you block SSH traffic but allow HTTP?"

Exam Tips for JN0-105

1. Understand the Exam Format

  • Questions: 65 multiple-choice questions.
  • Time: 90 minutes.
  • Passing Score: Typically around 60–70% (varies).

2. Manage Time Wisely

  • Spend no more than 1–2 minutes per question.
  • Flag difficult questions and return to them later if time allows.

3. Read Questions Carefully

  • Look for keywords like "not," "except," or "best."
  • Pay close attention to scenarios involving default Junos behaviors (e.g., implicit deny in routing policies or firewall filters).

4. Eliminate Wrong Answers

  • Narrow down your choices by:
    • Spotting incorrect commands or syntax.
    • Eliminating answers unrelated to the question's topic.

5. Prioritize Practical Questions

  • Focus on questions requiring interpretation of:
    • CLI outputs (e.g., routing tables, interface statuses).
    • Configuration snippets (e.g., identifying errors in a routing policy).

6. Leverage Junos Defaults

  • Remember default behaviors:
    • Junos routing policies reject routes unless explicitly allowed.
    • Firewall filters drop traffic unless specified otherwise.

7. Stay Calm and Focused

  • Use deep breaths to reset if you feel overwhelmed.
  • Trust your preparation and avoid second-guessing unless you’re confident an answer is wrong.

Key Takeaways

By combining hands-on practice, spaced repetition, and targeted study sessions, you can master the JN0-105 exam content efficiently. Use the suggested methods and tips to ensure you’re confident and well-prepared on exam day.