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JN0-331 pdf
  • Exam Code: JN0-331
  • Exam Name: SEC,Specialist(JNCIS-SEC)
  • Updated: Sep 06, 2026
  • Q & A: 131 Questions and Answers
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  • Exam Code: JN0-331
  • Exam Name: SEC,Specialist(JNCIS-SEC)
  • Updated: Sep 06, 2026
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Juniper JN0-331 Exam Syllabus Topics:

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

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

                                    Question 1

                                    Using a policy with the policy-rematch flag enabled, what happens to the existing and new sessions when you change the policy action from permit to deny?

                                    A. The new sessions matching the policy are denied. The existing sessions are dropped.
                                    B. The new sessions matching the policy might be allowed through if they match another policy. The existing sessions are dropped.
                                    C. The new sessions matching the policy are denied. The existing sessions, not being allowed to carry any traffic, simply timeout.
                                    D. The new sessions matching the policy are denied. The existing sessions continue until they are completed or their timeout is reached.


                                    Question 2

                                    Which parameters are valid SCREEN options for combating operating system probes?

                                    A. syn-fin, syn-ack-ack-proxy, and tcp-no-frag
                                    B. syn-fin, port-scan, and tcp-no-flag
                                    C. syn-fin, fin-no-ack, and tcp-no-frag
                                    D. syn-fin, syn-flood, and tcp-no-frag


                                    Question 3

                                    Click the Exhibit button.
                                    [edit security zones security-zone trust]
                                    user@host# show
                                    host-inbound-traffic {
                                    system-services {
                                    all;
                                    }}
                                    interfaces {
                                    ge-0/0/0.0;
                                    }
                                    Referring to the exhibit, which two traffic types are permitted when the destination is the ge-
                                    0/0/0.0 IP address? (Choose two.)

                                    A. Telnet
                                    B. RIP
                                    C. ICMP
                                    D. OSPF


                                    Question 4

                                    Your task is to provision the JUNOS security platform to permit transit packets from the
                                    Private zone to the External zone by using an IPsec VPN and log information at the time of
                                    session close.
                                    Which configuration meets this requirement?

                                    A. [edit security policies from-zone Private to-zone External]
                                    user@host# show
                                    policy allowTransit {
                                    match {
                                    source-address PrivateHosts;
                                    destination-address ExtServers;
                                    application ExtApps;
                                    }
                                    then {
                                    permit {
                                    tunnel {
                                    ipsec-vpn VPN;
                                    }}
                                    count {
                                    session-close;
                                    }}}
                                    B. [edit security policies from-zone Private to-zone External]
                                    user@host# show
                                    policy allowTransit {
                                    match {
                                    source-address PrivateHosts;
                                    destination-address ExtServers;
                                    application ExtApps;
                                    }
                                    then {
                                    permit {
                                    tunnel {
                                    ipsec-vpn VPN;
                                    log;
                                    count session-close;
                                    }}}}
                                    C. [edit security policies from-zone Private to-zone External]
                                    user@host# show
                                    policy allowTransit {
                                    match {
                                    source-address PrivateHosts;
                                    destination-address ExtServers;
                                    application ExtApps;
                                    }
                                    then {
                                    permit {
                                    tunnel {
                                    ipsec-vpn VPN;
                                    }}
                                    log {
                                    session-close;
                                    }}}
                                    D. [edit security policies from-zone Private to-zone External]
                                    user@host# show
                                    policy allowTransit {
                                    match {
                                    source-address PrivateHosts;
                                    destination-address ExtServers;
                                    application ExtApps;
                                    }
                                    then {
                                    permit {
                                    tunnel {
                                    ipsec-vpn VPN;
                                    }
                                    }
                                    log {
                                    session-init;
                                    }}}


                                    Question 5

                                    Click the Exhibit button.
                                    [edit security]
                                    user@host# show
                                    ike {
                                    policy ike-policy1 {
                                    mode main;
                                    proposal-set standard;
                                    pre-shared-key ascii-text "$9$GFjm5OBEclM5QCuO1yrYgo"; ## SECRET-DATA
                                    }
                                    gateway remote-ike {
                                    ike-policy ike-policy1;
                                    address 172.19.51.170;
                                    external-interface ge-0/0/3.0;
                                    }}
                                    ipsec {
                                    policy vpn-policy1 {
                                    proposal-set standard;
                                    }
                                    vpn remote-vpn {
                                    ike {
                                    gateway remote-ike;
                                    ipsec-policy vpn-policy1;
                                    }}}
                                    Assuming you want to configure a route-based VPN, which command is required to bind the VPN
                                    to secure tunnel interface st0.0?

                                    A. set ipsec policy vpn-policy1 bind-interface st0.0
                                    B. set ike gateway remote-ike bind-interface st0.0
                                    C. set ike policy ike-policy1 bind-interface st0.0
                                    D. set ipsec vpn remote-vpn bind-interface st0.0


                                    Solutions:

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

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