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

JN0-100 real exams

Exam Code: JN0-100

Exam Name: Juniper Networks Certified Internet Associate (JNCIA-JUNOS)

Updated: Aug 26, 2026

Q & A: 176 Questions and Answers

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About Juniper JN0-100 Exam

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Juniper JN0-100 Exam Syllabus Topics:

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

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

                                                                Question 1

                                                                What represents the decimal equivalence of 01101110?

                                                                A. 110
                                                                B. 90
                                                                C. 118
                                                                D. 96


                                                                Question 2

                                                                Which command will save the current active configuration as the rescue configuration?

                                                                A. user@router> request system configuration rescue save
                                                                B. user@router# save | rescue
                                                                C. user@router# save rescue configuration
                                                                D. user@router> file save rescue-configuration


                                                                Question 3


                                                                Referring to the exhibit, you are asked to rate-limit traffic from Web-Server to the subnet where Mal-User is located. All other traffic should be permitted.
                                                                Which firewall filter configuration do you use?

                                                                A. [edit firewall]
                                                                user@router# show
                                                                policer LIMIT-MAL-USER {
                                                                if-exceeding {
                                                                bandwidth-limit 400k;
                                                                burst-size-limit 100k;
                                                                }
                                                                then discard;
                                                                }
                                                                family inet {
                                                                filter STOP-MAL-USER {
                                                                term one {
                                                                from {
                                                                source-address {
                                                                100.100.100.10/32;
                                                                }
                                                                destination-address {
                                                                200.200.200.0/24;
                                                                }
                                                                }
                                                                then policer LIMIT-MAL-USER;
                                                                }
                                                                term two {
                                                                then reject;
                                                                }
                                                                }
                                                                }
                                                                B. [edit firewall]
                                                                user@router# show
                                                                policer LIMIT-MAL-USER {
                                                                if-exceeding {
                                                                bandwidth-limit 400k;
                                                                burst-size-limit 100k;
                                                                }
                                                                then discard;
                                                                }
                                                                family inet {
                                                                filter STOP-MAL-USER {
                                                                term one {
                                                                from {
                                                                source-address {
                                                                100.100.100.10/32;
                                                                }
                                                                destination-address {
                                                                200.200.200.0/24;
                                                                }
                                                                }
                                                                then policer LIMIT-MAL-USER;
                                                                }
                                                                term two {
                                                                then accept;
                                                                }
                                                                }
                                                                }
                                                                C. [edit firewall]
                                                                user@router# show
                                                                policer LIMIT-MAL-USER {
                                                                if-exceeding {
                                                                bandwidth-limit 400k;
                                                                burst-size-limit 100k;
                                                                }
                                                                then discard;
                                                                }
                                                                family inet {
                                                                filter STOP-MAL-USER {
                                                                term one {
                                                                from {
                                                                source-address {
                                                                200.200.200.0/24;
                                                                }
                                                                destination-address {
                                                                100.100.100.10/32;
                                                                }
                                                                }
                                                                then policer LIMIT-MAL-USER;
                                                                }
                                                                term two { then accept; } } }
                                                                D. [edit firewall]
                                                                user@router# show
                                                                policer LIMIT-BAD-USER {
                                                                if-exceeding {
                                                                bandwidth-limit 400k;
                                                                burst-size-limit 100k;
                                                                }
                                                                then discard;
                                                                }
                                                                family inet {
                                                                filter STOP-MAL-USER {
                                                                term one {
                                                                from {
                                                                source-address {
                                                                100.100.100.10/32;
                                                                }
                                                                destination-address {
                                                                200.200.200.0/24;
                                                                }
                                                                }
                                                                then policer LIMIT-MAL-USER;
                                                                }
                                                                term two {
                                                                then accept;
                                                                }
                                                                }
                                                                }


                                                                Question 4

                                                                Which command do you use to identify the meaning of a syslog message?

                                                                A. help log messages
                                                                B. man log messages
                                                                C. man syslog
                                                                D. help syslog


                                                                Question 5

                                                                How can you verify that you have correctly configured SSH access to your Junos device?

                                                                A. user@router> show configuration services
                                                                B. user@router# show configuration system services
                                                                C. user@router# show system services
                                                                D. user@router# show system login


                                                                Solutions:

                                                                Question 1
                                                                Answer: A
                                                                Question 2
                                                                Answer: A
                                                                Question 3
                                                                Answer: B
                                                                Question 4
                                                                Answer: D
                                                                Question 5
                                                                Answer: C

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