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Juniper JNCIS JN0-331

JN0-331

Exam Code: JN0-331

Exam Name: SEC,Specialist(JNCIS-SEC)

Updated: Sep 20, 2026

Q & A: 131 Questions and Answers

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Juniper JN0-331 Exam Syllabus Topics:

SectionObjectives
Topic 1: NAT (Network Address Translation)- NAT types and use cases
  • 1. Source NAT
    • 2. Destination NAT
      • 3. Static NAT
        Topic 2: Security Services and Features- Advanced security features
        • 1. Screening and DoS protection basics
          • 2. Logging and monitoring
            Topic 3: Security Fundamentals- Network security concepts
            • 1. Security zones and policies basics
              • 2. Threat types and attack vectors
                Topic 4: Troubleshooting and Operations- Security troubleshooting
                • 1. Policy evaluation issues
                  • 2. VPN connectivity diagnostics
                    Topic 5: VPN Technologies- VPN implementation
                    • 1. Site-to-site VPN concepts
                      • 2. Policy-based vs route-based VPNs
                        - IPsec VPN
                        • 1. VPN troubleshooting basics
                          • 2. IKE phases and negotiation
                            Topic 6: Security Policies and Firewall Filters- Firewall filters
                            • 1. Apply filters to interfaces
                              • 2. Filter terms and rules
                                - Policy configuration
                                • 1. Match criteria and actions
                                  • 2. Policy ordering and evaluation

                                    Juniper SEC,Specialist(JNCIS-SEC) Sample Questions:

                                    Question #1
                                    Which attribute is required for all IKE phase 2 negotiations?

                                    A. preshared key
                                    B. Diffie-Hellman group key
                                    C. main or aggressive mode
                                    D. proxy-ID


                                    Question #2
                                    A traditional router is better suited than a firewall device for which function?

                                    A. Network Address Translation
                                    B. VPN establishment
                                    C. packet-based forwarding
                                    D. stateful packet processing


                                    Question #3
                                    Which statement is true about a NAT rule action of off?

                                    A. The NAT action of off is useful for detailed control of NAT.
                                    B. The NAT action of off is only supported for source NAT rule-sets.
                                    C. The NAT action of off is useful for disabling NAT when a pool is exhausted.
                                    D. The NAT action of off is only supported for destination NAT rule-sets.


                                    Question #4
                                    Which two statements about the Diffie-Hellman (DH) key exchange process are correct? (Choose two.)

                                    A. In the DH key exchange process, the public and private keys are mathematically related using the DH algorithm.
                                    B. In the DH key exchange process, the public and private keys are not mathematically related, ensuring higher security.
                                    C. In the DH key exchange process, the session key is passed across the network to the peer for confirmation.
                                    D. In the DH key exchange process, the session key is never passed across the network.


                                    Question #5
                                    Which statement is true regarding proxy ARP?

                                    A. Proxy ARP is enabled by default on chassis clusters.
                                    B. Proxy ARP is enabled by default on stand-alone JUNOS security devices.
                                    C. JUNOS security devices can forward ARP requests to a remote device when proxy ARP is enabled.
                                    D. JUNOS security devices can reply to ARP requests intended for a remote device when proxy ARP is enabled.


                                    Solutions:

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

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