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

  • Exam Code: JN0-100
  • Exam Name: Juniper Networks Certified Internet Associate (JNCIA-JUNOS)
  • Updated: Aug 30, 2026     Q & A: 176 Questions and Answers

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Juniper JN0-100 Exam Syllabus Topics:

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

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

                                                                Question 1

                                                                Which statement is true regarding the Junos OS?

                                                                A. Processes share memory space but use separate ASICs so that one process cannot directly interfere with another.
                                                                B. Each process runs in its own protected memory space ensuring that one process cannot directly interfere with another.
                                                                C. A central processor called the IP2 Chip dynamically assigns memory as process needs fluctuate.
                                                                D. The memory management daemon (mmd) is responsible for allocating new memory for processes as they request it.


                                                                Question 2


                                                                Referring to the exhibit, you want to block HTTP access to Web-Server from the subnet where Mal-User is located. All other traffic should be permitted.
                                                                Which firewall filter configuration do you use?

                                                                A. [edit firewall family inet filter STOP-MAL-USER]
                                                                user@router# show
                                                                term one {
                                                                from {
                                                                source-address {
                                                                100.100.100.0/24;
                                                                }
                                                                destination-address {
                                                                200.200.200.1/32;
                                                                }
                                                                protocol tcp;
                                                                destination-port http;
                                                                }
                                                                then accept;
                                                                }
                                                                term two {
                                                                then {
                                                                reject;
                                                                }
                                                                }
                                                                B. [edit firewall family inet filter STOP-MAL-USER]
                                                                user@router# show
                                                                term one {
                                                                from {
                                                                source-address {
                                                                200.200.200.0/24;
                                                                }
                                                                destination-address {
                                                                100.100.100.10/32;
                                                                }
                                                                protocol tcp;
                                                                destination-port http;
                                                                }
                                                                then reject;
                                                                }
                                                                term two {
                                                                then {
                                                                accept;
                                                                }
                                                                }
                                                                C. [edit firewall family inet filter STOP-MAL-USER]
                                                                user@router# show
                                                                term one {
                                                                from {
                                                                source-address {
                                                                200.200.200.0/24;
                                                                }
                                                                destination-address {
                                                                100.100.100.10/32;
                                                                }
                                                                protocol tcp;
                                                                destination-port http;
                                                                }
                                                                then accept;
                                                                }
                                                                term two {
                                                                then {
                                                                reject;
                                                                }
                                                                }
                                                                D. [edit firewall family inet filter STOP-MAL-USER]
                                                                user@router# show
                                                                term one {
                                                                from {
                                                                source-address {
                                                                100.100.100.0/24;
                                                                }
                                                                destination-address {
                                                                200.200.200.1/32;
                                                                }
                                                                protocol tcp;
                                                                destination-port http;
                                                                }
                                                                then reject;
                                                                }
                                                                term two {
                                                                then {
                                                                accept;
                                                                }
                                                                }


                                                                Question 3

                                                                Which two statements are true about the primary address on an interface? (Choose two.)

                                                                A. It is the address used by default as the local address for broadcast and multicast packets sourced locally and sent out of the interface.
                                                                B. By default, the primary address on an interface is selected as the numerically highest local address configured on the interface.
                                                                C. You use the primary address when you have multiple IP addresses belonging to the same subnet on the same interface.
                                                                D. It can be useful for selecting the local address used for packets sent out of unnumbered interfaces when multiple non-127 addresses are configured on the loopback interface.


                                                                Question 4

                                                                Which command is used to display all output at once?

                                                                A. show interfaces | all
                                                                B. show interfaces | hold
                                                                C. show interfaces | no-more
                                                                D. show interfaces | display-all


                                                                Question 5

                                                                What are three examples of dynamic IGPs? (Choose three.)

                                                                A. RIP
                                                                B. IS-IS
                                                                C. OSPF
                                                                D. BGP
                                                                E. PIM


                                                                Solutions:

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

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