Juniper JN0-100 : Juniper Networks Certified Internet Associate (JNCIA-JUNOS)

  • Exam Code: JN0-100
  • Exam Name: Juniper Networks Certified Internet Associate (JNCIA-JUNOS)
  • Updated: Sep 05, 2026     Q & A: 176 Questions and Answers

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Juniper JN0-100 Exam Syllabus Topics:

SectionObjectives
Topic 1: Configuration Basics- Basic device configuration
  • 1. System configuration
    • 2. Interface configuration
      • 3. Configuration hierarchy
        • 4. Commit and rollback operations
          Topic 2: Networking Fundamentals- Basic networking concepts
          • 1. Subnetting and supernetting
            • 2. Longest-prefix match routing
              • 3. OSI and TCP/IP models
                • 4. Ethernet operations
                  • 5. IPv4 and IPv6 addressing
                    • 6. Functions of routers and switches
                      • 7. Collision and broadcast domains
                        Topic 3: User Interfaces- Management interfaces
                        • 1. CLI operation
                          • 2. J-Web interface
                            • 3. Configuration modes
                              • 4. Help and navigation commands
                                Topic 4: Operational Monitoring and Maintenance- Operations and troubleshooting
                                • 1. Operational mode commands
                                  • 2. Software installation and upgrades
                                    • 3. Ping and traceroute utilities
                                      • 4. Monitoring interfaces and system status
                                        Topic 5: Routing Policy and Firewall Filters- Policy fundamentals
                                        • 1. Basic traffic matching and actions
                                          • 2. Routing policy concepts
                                            • 3. Policy evaluation process
                                              • 4. Firewall filter concepts
                                                Topic 6: Routing Fundamentals- Basic routing concepts
                                                • 1. Routing tables and forwarding tables
                                                  • 2. Dynamic routing overview
                                                    • 3. Static routing
                                                      • 4. Route preference concepts
                                                        Topic 7: Junos OS Fundamentals- Junos architecture
                                                        • 1. Control and forwarding planes
                                                          • 2. Routing Engine and Packet Forwarding Engine
                                                            • 3. Transit and exception traffic processing
                                                              • 4. Software architecture

                                                                Juniper Networks Certified Internet Associate (JNCIA-JUNOS) Sample Questions:

                                                                Question #1

                                                                You have been allocated a 192.168.100.0/22 network.
                                                                How many usable hosts are available?

                                                                • A. 1022
                                                                • B. 1024
                                                                • C. 512
                                                                • D. 510
                                                                Answer: A
                                                                Question #2

                                                                Which statement is true about routing tables on a Junos device?

                                                                • A. They are exclusively designed to handle dynamic routing protocols.
                                                                • B. They exist in two places: the Routing Engine and the Packet Forwarding Engine.
                                                                • C. They purge any routes not selected as active routes.
                                                                • D. They populate the forwarding table.
                                                                Answer: D
                                                                Question #3

                                                                Which statement is true regarding the Junos OS?

                                                                • A. All platforms running the Junos OS use the same source code base.
                                                                • B. All platforms running the Junos OS use the same PFE.
                                                                • C. All platforms running the Junos OS use a hard drive to optimize syslog data storage.
                                                                • D. All platforms running the Junos OS use a separate process with protected memory space for each routing protocol.
                                                                Answer: A
                                                                Question #4

                                                                You configured an interface with an IP address and committed the change. You then committed a change that added an exception in a firewall filter to allow this network through the filter. You realize that this work was done on the wrong router.
                                                                How do you undo all these changes?

                                                                • A. rollback 2
                                                                • B. rollback 0
                                                                • C. rollback 1
                                                                • D. rollback 3
                                                                Answer: A
                                                                Question #5

                                                                Which two protocols use UDP as a transport protocol by default? (Choose two.)

                                                                • A. RIP
                                                                • B. DHCP
                                                                • C. ICMP
                                                                • D. Telnet
                                                                Answer: A,B

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