10 free Juniper JN0-637 JNCIP-SEC practice questions with the correct answer and a full explanation for each, taken from the CertStash pack of 103 questions. Work through them, then open each answer to check your reasoning.
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Question 1
Click the Exhibit button.
You can use SSH from SRX-1 to R-1 but not telnet. Both telnet and SSH services are enabled on R-1.
Referring to the exhibit, which configuration on SRX-1 is denying the access?
Show answer and explanation
Correct answer: C. The security policy from the junos-host zone to the TRUST zone is denying port 23.
TRUST zone is denying port 23. The diagram shows SRX-1 in the TRUST zone attempting to connect to R-1. When SRX-1 initiates a connection to R-1, the traffic originates from the junos-host zone (SRX-1's management/control plane) and is destined for the TRUST zone (where R-1 resides). Since SSH (port 22) works but telnet (port 23) does not, the security policy blocking telnet must be the one governing this traffic direction. The policy denying port 23 from the juno-ost zone to the TRUST zone is what prevents telnet access while allowing SSH.
Why the other options are wrong
- A. Port 22 (SSH) is working, so a policy denying port 22 in this direction would block SSH, contradicting the scenario.
- B. The policy from TRUST to junos-host would govern return traffic or responses, not the initial connection attempt that is being denied.
- D. While this policy direction exists, port 23 denial in the reverse direction (TRUST to junos-host) would not block the initial telnet connection attempt from SRX-1.
Question 2
In a multimode HA environment, which service must be configured to synchronize between nodes?
Show answer and explanation
Correct answer: B. IDP
In a multimode HA environment, the Identity Provider (IDP) service must be synchronized between nodes to ensure consistent threat detection and security policy enforcement. IDP handles security services like antivirus, anti-spam, and content filtering, which require state synchronization in HA deployments to maintain consistent protection across both nodes.
Why the other options are wrong
- A. PKI certificates are not typically synchronized as a dedicated service in HA; certificate management is handled separately.
- C. IPsec VPN is a user service, not a core infrastructure service requiring HA synchronization.
- D. Advanced policy-based routing is a forwarding function, not a synchronized service in HA deployments.
Question 3
Click the Exhibit button.
Referring to the exhibit, which statement about TLS 1.2 traffic is correct?
Show answer and explanation
Correct answer: C. TLS 1.2 traffic will be sent to routing instance R1 and forwarded to next hop 10.1.0.1.
TLS 1.2 traffic uses HTTPS (port 443), which matches the first rule 'Web-Proxy' that specifies 'dynamic-application [ junos:HTTP junos: HTTPS ]'. This rule directs matching traffic to routing-instance R1. Routing instance R1 is configured with instance-type forwarding and a static route for 192.168.0.0/16 via next-hop 10.1.0.1, so the traffic will be forwarded to that next hop. The DNS rule only matches the junos:DNS dynami-pplication-group and directs to R2, which does not apply to TLS 1.2 traffic.
Why the other options are wrong
- A. R2 is only used for DNS traffic, not TLS 1.2 traffic which matches the Web-Proxy rule routing to R1.
- B. TLS 1.2 traffic matches the Web-Proxy rule which routes to R1, not R2.
- D. R1 is configured with forwarding enabled and has a static route, so traffic will be forwarded to next hop 10.1.0.1.
Question 4
You are deploying threat remediation to endpoints connected through third-party devices.
In this scenario, which three statements are correct? (Choose three.)
Show answer and explanation
Correct answer: A, B, D
A. All third-party switches must support AAA/RADIUS and Dynamic Authorization Extensions to the RADIUS protocol. B. The connector uses an API to gather endpoint MAC address information from the RADIUS server. D. The connector queries the RADIUS server for the infected host endpoint details and initiates a change of authorization (CoA) for the infected host. Third-party device integration for threat remediation requires RADIUS/AAA support (A), with the connector gathering MAC address information via RADIUS API queries (B). The connector then queries the RADIUS server for infected host details and initiates CoA messages to remediate the threat (D). Automatic switch mapping does not occur, and RADIUS Status-Server messages are not the mechanism for updating infected host information.
Why the other options are wrong
- C. Switches are not automatically mapped and registered; manual configuration is required.
- E. RADIUS Status-Server messages are not used to update infected host information; CoA is the correct mechanism.
Question 5
Click the Exhibit button.
Referring to the exhibit, which three statements about the multinode HA environment are true? (Choose three.)
Show answer and explanation
Correct answer: A, C, E
A. Session state is synchronized on both nodes. C. Node 1 will host services redundancy group 1 unless it is unavailable. E. Two services redundancy groups are available. Statement A is true: the Cold Sync Status shows COMPLETE, indicating session state synchronization between nodes. Statement C is correct: Node 1 (Local-IP 10.10.1.1) is the active node with Services Redundancy Group 1 in ACTIVE status with Activeness Priority 200, meaning it hosts SRG 1 unless it fails. Statement E is accurate: two Services Redundancy Groups are present in the output (SRG 0 and SRG 1). Statement B is false because the SRG failure event codes are listed but show no active failures, the Failure Events field explicitly states NONE for SRG 1. Statement D is incorrect because when Node 1 is active for SRG 1, it processes transit traffic destined for that group; Node 2 (the backup with status BACKUP) only processes traffic if Node 1 becomes unavailable.
Why the other options are wrong
- B. The SRG 1 Failure Events field shows NONE, indicating no current IP monitoring failure.
- D. Node 1 is active for SRG 1 and processes transit traffic for it; Node 2 only processes such traffic when Node 1 is unavailable since it is in BACKUP status.
Question 6
Click the Exhibit button.
Referring to the exhibit, which three actions do you need to take to isolate the hosts at the switch port level if they become infected with malware? (Choose three.)
Show answer and explanation
Correct answer: B, C, E
B. Use a third-party connector. C. Configure AppTrack on the SRX Series device. E. Deploy Security Director with Policy Enforcer. To isolate infected hosts at the switch port level, three coordinated actions are required. First, deploy Security Director with Policy Enforcer (E) to manage and enforce isolation policies across the network infrastructure. Second, use a third-party connector (B) to integrate the SRX with external security systems and enable communication between the threat detection systems and the switching infrastructure for real-time response. Third, configure AppTrack on the SRX Series device (C) to track application behavior, identify malware signatures, and trigger automated isolation actions when threats are detected. Together, these three components create a closed-loop system where threats are detected, policies are enforced, and host ports are automatically isolated to prevent lateral movement.
Why the other options are wrong
- A. Juniper Secure Analytics is a monitoring and analysis tool that identifies threats but does not enforce port-level isolation actions.
- D. Enrolling the SRX with Juniper ARP Cloud provides cloud-based threat intelligence and correlation but is not required for direct switch port isolation at the endpoint level.
Question 7
Click the Exhibit button.
Referring to the exhibit, which two statements are true? (Choose two.)
Show answer and explanation
Correct answer: B, D
B. The SRX is sending traffic into the tunnel and out toward the VPN peer. D. The SRX is not receiving any packets from the VPN peer. The ESP statistics show 2640 encrypted bytes and 22 encrypted packets, indicating the SRX is actively sending traffic into the tunnel toward the VPN peer (option B is true). The decrypted bytes and packets are both 0, meaning no traffic has been received from the VPN peer, so the SRX is not receiving any packets from the peer (option D is true). Option A is incorrect because the replay errors (18) do not necessarily mean every packet is outside the window, replay errors indicate some packets failed validation, not a universal condition. Option C is false because the encrypted packet count of 22 proves the SRX is actively sending packets to the VPN peer.
Why the other options are wrong
- A. Replay errors of 18 indicate some packets failed replay checks, not that every received packet is outside the ESP sequence window.
- C. The 22 encrypted packets and 2640 encrypted bytes demonstrate the SRX is actively sending traffic to the VPN peer, contradicting this statement.
Question 8
You have deployed automated threat mitigation using Security Director with Policy Enforcer, Juniper ATP Cloud, SRX Series devices, and EX Series switches.
In this scenario, which device is responsible for blocking the infected hosts?
Show answer and explanation
Correct answer: A. EX Series switch
The EX Series switch is responsible for blocking infected hosts at the network access layer through dynamic VLAN assignment and port isolation. Security Director orchestrates the policy, Policy Enforcer coordinates the response, and Juniper ATP Cloud provides threat intelligence, but the EX switch executes the actual blocking action by restricting network access.
Why the other options are wrong
- B. Juniper ATP Cloud provides threat detection and intelligence, not blocking enforcement.
- C. Policy Enforcer coordinates remediation policies but does not perform the blocking action.
- D. Security Director orchestrates the overall mitigation workflow but does not directly block traffic.
Question 9
You are asked to see if your persistent NAT binding table is exhausted.
Which show command would you use to accomplish this task?
Show answer and explanation
Correct answer: A. show security nat source persistent-nat-table summary
The command 'show security nat source persistent-nat-table summary' displays a summary of the persistent NAT binding table including usage statistics that reveal whether the table is exhausted. This is the standard command for monitoring persistent NAT table capacity on SRX devices.
Why the other options are wrong
- B. The 'all' option shows detailed entries rather than a summary, making it less practical for identifying exhaustion.
- C. This command shows NAT pool information, not the persistent binding table status.
- D. This command shows general NAT summary statistics but not specific persistent table information.
Question 10
Click the Exhibit button.
Referring to the exhibit, which two statements about User1 are true? (Choose two.)
Show answer and explanation
Correct answer: C, D
C. User1 is logged in to logical system LSYS-1. D. User1 has access to the configuration specific to their assigned logical system. The exhibit shows User1 logged into a Junos device with the prompt 'User1@SRX:LSYS-1>', which directly indicates User1 is currently logged in to logical system LSYS-1, making option C true. In Junos logical systems architecture, users assigned to a specific logical system have access only to the configuration and resources of that assigned logical system, which is a fundamental principle of logical system isolation. This makes option D true. Option A is false because users cannot arbitrarily add logical units to interfaces without proper administrative permissions and prior configuration by primary administrators. Option B is false because users are restricted to viewing outputs and configurations only within their assigned logical system; they cannot view outputs from other user logical systems due to the security isolation between logical systems.
Why the other options are wrong
- A. Standard users cannot add logical units to interfaces; only primary administrators can assign logical units to interfaces.
- B. Logical system isolation prevents User1 from viewing outputs and configurations of other user logical systems.
That was 10 of 103.
The full Juniper JN0-637 JNCIP-SEC pack has all 103 questions, each with the answer, the explanation and why the other options are wrong, plus a questions-only copy for timed runs. US$39, paid once, with free monthly updates and a pass-or-your-money-back guarantee.