2026 Best JN0-637 Exam Preparation Material with New Dumps Questions [Q15-Q34]

JN0-637 Juniper

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February 11, 2026

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2026 Best JN0-637 Exam Preparation Material with New Dumps Questions

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NO.15 Which two statements are correct about DNS doctoring?

The DNS ALG must be disabled.

Proxy ARP is required if your NAT pool for the server is on the same subnet as the uplink interface.

Proxy ARP is required if your NAT pool for the server is on a different subnet as the uplink interface

The DNS ALG must be enabled.

NO.16 Exhibit:

The security trace options configuration shown in the exhibit is committed to your SRX series firewall.
Which two statements are correct in this Scenario? (Choose Two)

The file debugger will be readable by all users.

Once the trace has generated 10 log files, older logs will be overwritten.

Once the trace has generated 10 log files, the trace process will halt.

The file debugger will be readable only by the user who committed this configuration

Once the trace has generated 10 log files, older logs will be overwritten. – This is generally true if the configuration includes a file count limit and the ‘world-readable’ flag. Without the ‘world-readable’ flag, only the file’s owner or superuser can read the file. If the ‘no-world-readable’ flag is set, only the user that created the file and root can read it.
Once the trace has generated 10 log files, the trace process will halt. – This would be true only if the ‘files’ statement is used without the ‘world-readable’ or ‘no-world-readable’ flag. If ‘no-world-readable’ is set, the trace files are not readable by all users.

NO.17 Your company wants to use the Juniper Seclntel feeds to block access to known command and control servers, but they do not want to use Security Director to manage the feeds.
Which two Juniper devices work in this situation? (Choose two)

EX Series devices

MX Series devices

SRX Series devices

QFX Series devices

NO.18 Exhibit

Which statement is true about the output shown in the exhibit?

The SRX Series device is configured with default security forwarding options.

The SRX Series device is configured with packet-based IPv6 forwarding options.

The SRX Series device is configured with flow-based IPv6 forwarding options.

The SRX Series device is configured to disable IPv6 packet forwarding.

NO.19 You Implement persistent NAT to allow any device on the external side of the firewall to initiate traffic.

Referring to the exhibit, which statement is correct?

The target-host parameter should be used instead of the any-remote-host parameter.

The port-overloading parameter needs to be turned off in the NAT source interface configuration

The target-host-port parameter should be used instead of the any-remote-host parameter

The any-remote-host parameter does not support interface-based NAT and needs an IP pod to work.

NO.20 Referring to the exhibit,

which three statements about the multinode HA environment are true? (Choose three.)

Two services redundancy groups are available.

IP monitoring has failed for the services redundancy group.

Node 1 will host services redundancy group 1 unless it is unavailable.

Session state is synchronized on both nodes.

Node 2 will process transit traffic that it receives for services redundancy group 1.

Referring to the exhibit for a multinode HA environment, we can conclude the following about the HA setup:
* Two Services Redundancy Groups (Correct: Option A):The output shows the status of SRG 0 and SRG 1, confirming that there are two services redundancy groups in the HA configuration.
* Node 1 Hosting SRG 1 (Correct: Option C):The exhibit indicates that Node 1 is currently active for SRG 1. According to the configuration, Node 1 will continue to host SRG 1 unless it becomes unavailable.
* Session State Synchronization (Correct: Option D):In this HA setup, session state synchronization is enabled between the two nodes. This ensures that sessions remain active and seamless failover can occur if one node fails.
Juniper References:
* Juniper HA Documentation: Provides details on multinode HA setups, SRG configurations, and session synchronization.

NO.21 Exhibit

Which two statements are correct about the output shown in the exhibit? (Choose two.)

The packet is silently discarded.

The packet is part of an existing session.

The packet is part of a new session.

The packet is explicitly rejected.

NO.22 Exhibit

You are using traceoptions to verify NAT session information on your SRX Series device.
Referring to the exhibit, which two statements are correct? (Choose two.)

This is the last packet in the session.

The SRX Series device is performing both source and destination NAT on this session.

This is the first packet in the session.

The SRX Series device is performing only source NAT on this session.

NO.23 You want to use a security profile to limit the system resources allocated to user logical systems.
In this scenario, which two statements are true? (Choose two.)

If nothing is specified for a resource, a default reserved resource is set for a specific logical system.

If you do not specify anything for a resource, no resource is reserved for a specific logical system, but the entire system can compete for resources up to the maximum available.

One security profile can only be applied to one logical system.

One security profile can be applied to multiple logical systems.

When using security profiles to limit system resources in Juniper logical systems:
* No Resource Specification (Answer B): If a resource limit isnot specifiedfor a logical system, no specific amount of system resources is reserved for it. Instead, the logical system competes for resources along with others in the system, up to the maximum available. This allows flexible resource allocation, where logical systems can scale based on actual demand rather than predefined limits.
* Multiple Logical Systems per Security Profile (Answer D): A single security profile can be applied to multiple logical systems. This allows administrators to define resource limits once in a profile and apply it across several logical systems, simplifying management and ensuring consistency across different environments.
These principles ensure efficient and flexible use of system resources within a multi-tenant or multi-logical- system environment.

NO.24 You have deployed an SRX Series device at your network edge to secure Internet-bound sessions for your local hosts using source NAT. You want to ensure that your users are able to interact with applications on the Internet that require more than one TCP session for the same application session.
Which two features would satisfy this requirement? (Choose two.)

address persistence

STUN

persistent NAT

double NAT

Address persistence ensures that the same NAT IP address is used for all sessions originating from a single source IP. Persistent NAT maintains connections for applications needing multiple sessions, like VoIP.
Additional details are available in Juniper NAT Documentation.
For applications that require multiple TCP sessions for the same application session (such as VoIP or certain online games), the SRX device needs to handle NAT properly to maintain session continuity. Here’s what helps:
* Address Persistence (Answer A): Address persistence ensures that multiple sessions initiated by the same internal host are mapped to the same external IP address. This is crucial for applications that use multiple TCP sessions to maintain a stateful connection with the external server.
Command Example:
bash
set security nat source persistent-nat address-persistence
* Persistent NAT (Answer C): This feature allows the external server to initiate new connections to the internal client using the same NAT translation. It’s essential for applications that require consistent NAT mappings across multiple sessions.
Command Example:
bash
set security nat source persistent-nat permit target-host-port
These features ensure that applications with multiple TCP sessions work seamlessly across NAT.

NO.25 Exhibit.

Referring to the exhibit, which two statements are true? (Choose two.)

The configured solution allows IPv6 to IPv4 translation.

The configured solution allows IPv4 to IPv6 translation.

The IPv6 address is invalid.

External hosts cannot initiate contact.

NO.26 Exhibit:

Referring to the exhibit, a default static route on SRX-1 sends all traffic to ISP-A. You have configured APBR to send all requests for streaming video traffic to ISP-B. However, the return traffic from the streaming video server is coming through ISP-A, and the traffic is being dropped by SRX-1. You can only make changes on SRX-1.
How do you solve this problem?

Place both ISP-facing interfaces in the same zone.

Change the APBR routing instance from a forwarding instance to a virtual router instance.

Enable AppTrack to keep track of the sessions and zones for the streaming video traffic.

Configure BGP to control the return path of the streaming video traffic.

A virtual router instance allows for independent routing tables, which helps manage asymmetric routing issues in APBR configurations. This ensures both initial and return traffic follow the same path, resolving session issues. Further details: Juniper APBR Configuration.
The issue in the scenario stems from asymmetric routing. The SRX-1 device sends streaming traffic to ISP-B (as intended) using APBR, but the return traffic is coming back through ISP-A due to the default route.
Because APBR uses forwarding instances, the traffic is dropped when it returns through a different zone.
To solve this:
* Change APBR routing instance to a virtual router (Answer B): By changing the APBR routing instance to a virtual router, the SRX will maintain separate routing tables for each ISP, ensuring proper bidirectional traffic flow. Virtual routers provide independent routing tables and are ideal for ensuring traffic symmetry in multi-homed environments.
Example Command:
bash
Copy code
set routing-instances ISP-B instance-type virtual-router
set routing-instances ISP-B routing-options static route 0.0.0.0/0 next-hop 192.0.2.1 By implementing virtual routing instances, you can resolve the asymmetry and ensure that both outbound and return traffic use the same ISP.

NO.27 Your IPsec tunnel is configured with multiple security associations (SAs). Your SRX Series device supports the CoS-based IPsec VPNs with multiple IPsec SAs feature. You are asked to configure CoS for this tunnel.
Which two statements are true in this scenario? (Choose two.)

The local and remote gateways do not need the forwarding classes to be defined in the same order.

A maximum of four forwarding classes can be configured for a VPN with the multi-sa forwarding- classes statement.

The local and remote gateways must have the forwarding classes defined in the same order.

A maximum of eight forwarding classes can be configured for a VPN with the multi-sa forwarding- classes statement.

NO.28 Referring to the exhibit, you have been assigned the user LogicalSYS1 credentials shown in the configuration.

In this scenario, which two statements are correct? (Choose two.)

When you log in to the device, you will be permitted to view all routing tables available on the SRX device

When you log in to the device, you will be permitted to view only the routing tables for Logic

When you log in to the device, you will be located at the operational mode of the Logic

When you log in to the device, you will be located at the operational mode of the main system

NO.29 Exhibit

You are using traceoptions to verity NAT session information on your SRX Series device Referring to the exhibit, which two statements are correct? (Choose two.)

This packet is part of an existing session.

The SRX device is changing the source address on this packet from

This is the first packet in the session

The SRX device is changing the destination address on this packet 10.0.1 1 to 172 20.101.10.

NO.30 Exhibit:

You are configuring NAT64 on your SRX Series device. You have committed the configuration shown in the exhibit. Unfortunately, the communication with the 10.10.201.10 server is not working. You have verified that the interfaces, security zones, and security policies are all correctly configured.
In this scenario, which action will solve this issue?

Configure source NAT to translate return traffic from IPv4 address to the IPv6 address of your source device.

Configure proxy-ARP on the external IPv4 interface for the 10.10.201.10/32 address.

Configure proxy-NDP on the IPv6 interface for the 2001:db8::1/128 address.

Configure destination NAT to translate return traffic from the IPv4 address to the IPv6 address of your source device.

NO.31 You are asked to see if your persistent NAT binding table is exhausted.
Which show command would you use to accomplish this task?

show security nat source persistent-nat-table summary

show security nat source summary

show security nat source pool all

show security nat source persistent-nat-table all

The command show security nat source persistent-nat-table all provides a comprehensive view of all entries in the persistent NAT table, enabling administrators to monitor and manage resource exhaustion. Refer to Juniper NAT Monitoring Guide for more.
In Junos OS, whenpersistent NATis configured, a binding table is created to keep track of NAT sessions and ensure that specific hosts are allowed to initiate sessions back to internal hosts. To check if the persistent NAT binding table is full or exhausted, the correct command must display theentire table.
* Correct Command (D):
* The commandshow security nat source persistent-nat-table allwill display the entire persistent NAT binding table. This allows you to check whether the table is exhausted or if there is space available for new persistent NAT sessions.
* Incorrect Options:
* Option A: The command show security nat source persistent-nat-table summary provides a summary view but does not give detailed insights into whether the table is exhausted.
* Option BandOption C: These commands deal with general NAT source summaries or pools, which are not related specifically to persistent NAT bindings.
Juniper References:
* Juniper Persistent NAT Documentation: Describes the persistent NAT binding table and the commands used to monitor its status.

NO.32 Exhibit:

Referring to the exhibit, which two statements are correct?

All of the entries are a threat level 8

All of the entries are command and control entries.

All of the entries are Dshield entries

All of the entries are a threat level 10.

Referring to the exhibit, the following statements are correct:
B) All of the entries are command and control entries. Command and control entries are dynamic addresses that represent the IP addresses of servers that are used by malware to communicate with infected hosts. The SRX Series device can block or log the traffic to or from these IP addresses based on the security policies. The exhibit shows that all of the entries have the category DC/1, which stands for command and control1.
C) All of the entries are Dshield entries. Dshield is a feed source that provides a list of IP addresses that are associated with malicious activities, such as scanning, spamming, or attacking. The SRX Series device can download the Dshield feed and use it to populate the dynamic address entries. The exhibit shows that all of the entries have the feed dshield, which indicates that they are from the Dshield feed source2.
The other statements are incorrect because:
A) All of the entries are not a threat level 8, but a threat level 10. The threat level is a numeric value that indicates the severity of the threat associated with a dynamic address entry. The higher the threat level, the more dangerous the threat. The SRX Series device can use the threat level to prioritize the actions for the dynamic address entries. The exhibit shows that all of the entries have the cc CN, which stands for country code China. According to the Juniper documentation, the country code China has a threat level of 10, which is the highest.
D) All of the entries are not a threat level 10, but they are. See the explanation for option A.
Reference: Understanding Dynamic Address Categories Understanding Dynamic Address Feed Sources
[Understanding Dynamic Address Threat Levels]

NO.33 Which two statements are correct regarding tenant systems on SRX Series devices? (Choose two.)

A maximum of 32 tenant systems can be configured on a physical SRX device.

All tenant systems share a single routing protocol process.

Each tenant system runs its own instance of the routing protocol process

A maximum of 500 tenant systems can be configured on a physical SRX device.

NO.34 You are using ADVPN to deploy a hub-and-spoke VPN to connect your enterprise sites. Which two statements are true in this scenario? (Choose two.)

ADVPN creates a full-mesh topology.

IBGP routing is required.

OSPF routing is required.

Certificate-based authentication is required.

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