[Dec 15, 2025] JN0-637 Free Exam Questions with Quality Guaranteed
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Juniper JN0-637 Exam Syllabus Topics:
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NEW QUESTION # 21
You are required to secure a network against malware. You must ensure that in the event that a compromised host is identified within the network.
In this scenario after a threat has been identified, which two components are responsible for enforcing MAC-level infected host?
- A. EX Series device
- B. SRX Series device
- C. Policy Enforcer
- D. Juniper ATP Appliance
Answer: A,C
Explanation:
You are required to secure a network against malware. You must ensure that in the event that a compromised host is identified within the network, the host is isolated from the rest of the network.
In this scenario, after a threat has been identified, the two components that are responsible for enforcing MAC-level infected host are:
C) Policy Enforcer. Policy Enforcer is a software solution that integrates with Juniper ATP Cloud and Juniper ATP Appliance to provide automated threat remediation across the network. Policy Enforcer can receive threat intelligence feeds from Juniper ATP Cloud or Juniper ATP Appliance and apply them to the security policies on the SRX Series devices and the EX Series devices. Policy Enforcer can also enforce MAC-level infected host, which is a feature that allows you to quarantine a compromised host by blocking its MAC address on the switch port. Policy Enforcer can communicate with the EX Series devices and instruct them to apply the MAC-level infected host policy to the infected host1.
D) EX Series device. EX Series devices are Ethernet switches that can provide Layer 2 and Layer 3 switching capabilities and security features. EX Series devices can integrate with Policy Enforcer and Juniper ATP Cloud or Juniper ATP Appliance to provide automated threat remediation across the network. EX Series devices can support MAC-level infected host, which is a feature that allows them to quarantine a compromised host by blocking its MAC address on the switch port. EX Series devices can receive instructions from Policy Enforcer and apply the MAC-level infected host policy to the infected host2.
The other options are incorrect because:
A) SRX Series device. SRX Series devices are high-performance firewalls that can provide Layer 3 and Layer 4 security features and integrate with Juniper ATP Cloud or Juniper ATP Appliance to provide advanced threat prevention. SRX Series devices can receive threat intelligence feeds from Juniper ATP Cloud or Juniper ATP Appliance and apply them to the security policies. However, SRX Series devices cannot enforce MAC-level infected host, which is a feature that requires Layer 2 switching capabilities and is supported by EX Series devices3.
B) Juniper ATP Appliance. Juniper ATP Appliance is a hardware solution that provides advanced threat prevention by detecting and blocking malware, ransomware, and other cyberattacks. Juniper ATP Appliance can analyze the network traffic and identify the compromised hosts based on their behavior and communication patterns. Juniper ATP Appliance can also send threat intelligence feeds to Policy Enforcer and SRX Series devices to enable automated threat remediation across the network. However, Juniper ATP Appliance cannot enforce MAC-level infected host, which is a feature that requires Layer 2 switching capabilities and is supported by EX Series devices.
Reference: Policy Enforcer Overview EX Series Switches Overview
SRX Series Services Gateways Overview [Juniper ATP Appliance Overview]
NEW QUESTION # 22
The exhibit shows part of the flow session logs.
Which two statements are true in this scenario? (Choose two.)
- A. The existing session is found in the table, and the fast path process begins.
- B. This packet arrives on interface ge-0/0/4.0.
- C. Junos captures a TCP packet from source address 172.20.101.10 destined to 10.0.1.129.
- D. Destination NAT occurs.
Answer: B,D
NEW QUESTION # 23
Regarding IPsec CoS-based VPNs, what is the number of IPsec SAs associated with a peer based upon?
- A. The number of forwarding classes configured for the VPN.
- B. The number of traffic selectors configured for the VPN.
- C. The number of CoS queues configured for the VPN.
- D. The number of classifiers configured for the VPN.
Answer: B
NEW QUESTION # 24
Exhibit
Referring to the exhibit, an internal host is sending traffic to an Internet host using the 203.0.113.1 reflexive address with source port 54311.
Which statement is correct in this situation?
- A. Any host on the Internet can initiate traffic to reach the internal host using the 203.0.113.1 address, source port 54311, and a random destination port.
- B. Only the Internet host that the internal host originally communicated with can initiate traffic to reach the internal host using the 203.0 113.1 address, a random source port, and destination port 54311.
- C. Any host on the Internet can initiate traffic to reach the internal host using the 203.0.113.1 address, a random source port, and destination port54311.
- D. Only the Internet host that the internal host originally communicated with can initiate traffic to reach the internal host using the 203.0.113.1 address, source port 54311, and a random destination port.
Answer: A
NEW QUESTION # 25
you configured a security policy permitting traffic from the trust zone to the untrust zone but your traffic not hitting the policy.
In this scenario, which cli command allows you to troubleshoot traffic problem using the match criteria?
- A. request security policies check
- B. show security match-policies
- C. show security policy-report
- D. show security application-tracking counters
Answer: B
Explanation:
To troubleshoot the traffic problem using the match criteria, you need to use the show security match- policies CLI command.
The other options are incorrect because:
A) The show security policy-report CLI command displays the policy report, which is a summary of the policy usage statistics, such as the number of sessions, bytes, and packets that match each policy. It does not show the match criteria or the reason why the traffic is not hitting the policy1.
B) The show security application-tracking counters CLI command displays the application tracking counters, which are the statistics of the application usage, such as the number of sessions, bytes, and packets that match each application. It does not show the match criteria or the reason why the traffic is not hitting the policy2.
D) The request security policies check CLI command checks the validity and consistency of the security policies, such as the syntax, the references, and the conflicts. It does not show the match criteria or the reason why the traffic is not hitting the policy3.
Therefore, the correct answer is C. You need to use the show security match-policies CLI command to troubleshoot the traffic problem using the match criteria. The show security match-policies CLI command displays the policies that match the specified criteria, such as the source and destination addresses, the zones, the protocols, and the ports. It also shows the action and the hit count of each matching policy.
You can use this command to verify if the traffic is matching the expected policy or not, and if not, what policy is blocking or rejecting the traffic4
NEW QUESTION # 26
Which two statements are true regarding NAT64? (Choose two.)
- A. An SRX Series device should be in flow-based forwarding mode for IPv6.
- B. An SRX Series device should be in packet-based forwarding mode for IPv6.
- C. An SRX Series device should be in packet-based forwarding mode for IPv4.
- D. An SRX Series device should be in flow-based forwarding mode for IPv4.
Answer: A,D
Explanation:
NAT64 requires flow-based forwarding for both IPv4 and IPv6 to ensure proper stateful inspection and address translation. Packet-based forwarding does not support the necessary stateful inspection needed for NAT64. For more on NAT64, refer to Juniper NAT64 Overview.
NAT64 allows communication between IPv6 and IPv4 devices by translating IPv6 addresses to IPv4 addresses and vice versa. On Juniper SRX devices, the device's forwarding mode is crucial in how the device processes traffic.
* Flow-based forwarding mode:
* Correct: Option C: For IPv4 traffic in NAT64 configurations, SRX devices should be in flow- based forwarding mode. Flow-based mode means that the device inspects traffic sessions and tracks state, which is essential for proper NAT64 operations. This mode enables the device to monitor and translate between IPv4 and IPv6 protocols dynamically while maintaining session states.
* Correct: Option D: Similarly, for IPv6 traffic, the SRX device should also be in flow-based mode. Flow-based mode ensures the SRX tracks the IPv6-to-IPv4 translations properly by preserving the state of each connection, ensuring consistent NAT64 operations.
* Packet-based forwarding mode:Packet-based mode is not used for NAT64 operations because it does not provide stateful inspection, which is required for NAT64 to function correctly. Hence, options A and B are incorrect.
Juniper References:
* Juniper NAT64 Documentation: Discusses how NAT64 functions on SRX devices and specifies the requirement of flow-based mode for both IPv4 and IPv6 traffic when translating between these protocols.
NEW QUESTION # 27
You want to create a connection for communication between tenant systems without using physical revenue ports on the SRX Series device.
What are two ways to accomplish this task? (Choose two.)
- A. Use a secure wire.
- B. Use an external router.
- C. Use a point-to-point logical tunnel.
- D. Use an interconnect VPLS switch.
Answer: A,C
Explanation:
Secure wire and logical tunnels provide internal connectivity options for isolated tenant systems within an SRX device, avoiding the need for physical interfaces. Secure wire maintains security context, while logical tunnels facilitate inter-system communication. More on this can be found at Juniper Tenant Systems Documentation.
To create a connection between tenant systems without using physical interfaces on an SRX Series device, you have two effective options:
* Secure Wire (Answer C): This feature allows you to create a secure, internal connection between security zones. Essentially, traffic is bridged between two zones without needing to pass through physical interfaces, providing a "virtual" wire.
Configuration Example:
bash
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set security zones security-zone zone1 interfaces ge-0/0/0.0 host-inbound-traffic system-services all set security zones security-zone zone2 interfaces ge-0/0/1.0 host-inbound-traffic system-services all set security secure-wire secure-wire1 from-zone zone1 to-zone zone2
* Point-to-Point Logical Tunnel (Answer D): This establishes a virtual connection between two different points (zones or systems) within the SRX device using logical interfaces like lt (logical tunnel interfaces). No physical ports are required, and it's useful for connecting isolated tenant systems.
Configuration Example:
bash
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set interfaces lt-0/0/0 unit 0 family inet address 192.168.1.1/30
set interfaces lt-0/0/1 unit 0 family inet address 192.168.1.2/30
set security zones security-zone zone1 interfaces lt-0/0/0.0
set security zones security-zone zone2 interfaces lt-0/0/1.0
Both methods are suitable for connecting systems within the SRX without using physical interfaces.
NEW QUESTION # 28
Exhibit
The show network-access aaa radius-servers command has been issued to solve authentication issues.
Referring to the exhibit, to which two authentication servers will the SRX Series device continue to send requests? (Choose TWO)
- A. 200l:DB8:0:f101;:2
- B. 192.168.30.188
- C. 192.168.30.190
- D. 192.168.30.191
Answer: B,D
NEW QUESTION # 29
Exhibit:
Referring to the exhibit, what do you use to dynamically secure traffic between the Azure and AWS clouds?
- A. You can dynamically secure traffic between the clouds by using user identities in the security policies.
- B. You can dynamically secure traffic between the clouds by using security tags in the security policies.
- C. You can dynamically secure traffic between the clouds by using advanced connection tracking in the security policies.
- D. You can dynamically secure traffic between the clouds by using URL filtering in the security policies.
Answer: B
Explanation:
Security tags facilitate dynamic traffic management between cloud environments like Azure and AWS. Tags allow flexible policies that respond to cloud-native events or resource changes, ensuring secure inter-cloud communication. For more information, see Juniper Cloud Security Tags.
In the scenario depicted in the exhibit, where traffic needs to be dynamically secured between Azure and AWS clouds, the best method to achieve dynamic security is by using security tags in the security policies.
Security tags allow dynamic enforcement of security policies based on metadata rather than static IP addresses or zones. This is crucial in cloud environments, where resources and IP addresses can change dynamically.
Using security tags in the security policies, you can associate traffic flows with specific applications, services, or virtual machines, regardless of their underlying IP addresses or network locations. This ensures that security policies are automatically updated as cloud resources change.
NEW QUESTION # 30
Exhibit
Referring to the exhibit, which three statements are true? (Choose three.)
- A. The packet is allowed to make an SSH connection.
- B. The packet is dropped before making an SSH connection.
- C. The packet's destination is to a server in the DMZ zone.
- D. The packet's destination is to an interface on the SRX Series device.
- E. The packet originated within the Trust zone.
Answer: B,D,E
NEW QUESTION # 31
Exhibit
Which statement is true about the output shown in the exhibit?
- A. The SRX Series device is configured to disable IPv6 packet forwarding.
- B. The SRX Series device is configured with default security forwarding options.
- C. The SRX Series device is configured with flow-based IPv6 forwarding options.
- D. The SRX Series device is configured with packet-based IPv6 forwarding options.
Answer: B
NEW QUESTION # 32
Referring to the exhibit, which two statements are true ?
- A. The SRX is sending traffic into the tunnel and out toward the VPN peer.
- B. The SRX is not sending any packets to the VPN peer.
- C. Every VPN packet that the SRX receives from the VPN peer is outside the ESP sequence window
- D. The SRX is not receiving any packets from the VPN peer.
Answer: A,D
NEW QUESTION # 33
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?
- A. Configure source NAT to translate return traffic from IPv4 address to the IPv6 address of your source device.
- B. Configure proxy-ARP on the external IPv4 interface for the 10.10.201.10/32 address.
- C. Configure proxy-NDP on the IPv6 interface for the 2001:db8::1/128 address.
- D. Configure destination NAT to translate return traffic from the IPv4 address to the IPv6 address of your source device.
Answer: A
Explanation:
In the scenario described, you are configuring NAT64, which allows communication between IPv6 and IPv4 networks by translating IPv6 packets to IPv4 and vice versa. The configuration in the exhibit shows an attempt to translate traffic coming from the IPv6 address 2001:db8::1/128 and destined for the IPv4 address
10.10.201.10/32.
However, the issue here is related to the return traffic. For NAT64 to function correctly, you must ensure that the return traffic (from the IPv4 network) is translated back to the original IPv6 source address. Without proper translation of the return traffic, the communication will not be successful. In this case, you needsource NATto handle the return traffic correctly.
Detailed Solution:
* In NAT64, when traffic originates from an IPv6 network and is translated to IPv4, the return traffic from the IPv4 network must be translated back to the original IPv6 address usingsource NAT.
* The source NAT configuration must include translation for the return path from IPv4 to IPv6 to ensure bidirectional communication.
Configuration Example:
To resolve the issue, you can configure source NAT on the SRX device to handle the translation of the return traffic as follows:
* Configure Source NAT for Return Traffic:You need to configure source NAT on the interface handling the return traffic. This will translate the IPv4 address back to the IPv6 source address.
Example:
bash
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set security nat source rule-set ipv4-source-rule from zone untrust
set security nat source rule-set ipv4-source-rule to zone trust
set security nat source rule-set ipv4-source-rule rule source-nat-translation match source-address 10.10.201.10
/32
set security nat source rule-set ipv4-source-rule rule source-nat-translation then source-nat pool ipv6-source- pool
* Ensure Proper Routing and Security Policy Configuration:Make sure that both the IPv4 and IPv6 routes are correctly defined, and that security policies are allowing the return traffic through.
Use the following commands to verify the NAT and policy configurations:
bash
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show security nat source
show security policies
By configuring source NAT to translate the return traffic back to IPv6, the communication between the IPv6 host and the IPv4 server should now work correctly.
Juniper Security Reference:
* NAT64 Overview: This functionality allows IPv6 clients to communicate with IPv4-only servers. For successful translation, NAT64 requires both source NAT and destination NAT to handle the bidirectional traffic. Reference: Juniper Networks Documentation on NAT64.
NEW QUESTION # 34
Refer to the Exhibit.
Referring to the exhibit, which three topologies are supported by Policy Enforcer? (Choose three.)
- A. Topology 3
- B. Topology 4
- C. Topology 5
- D. Topology 2
- E. Topology 1
Answer: A,B,E
Explanation:
Reference: https://www.juniper.net/documentation/en_US/junos-space17.2/policy- enforcer/topics/concept/policy-enforcer-deployment-supported-topologies.html
NEW QUESTION # 35
Which two security intelligence feed types are supported?
- A. infected host feed
- B. custom feeds
- C. malicious URL feed
- D. Command and Control feed
Answer: A,B
Explanation:
The two security intelligence feed types that are supported are:
A) Infected host feed. An infected host feed is a security intelligence feed that contains the IP addresses of hosts that are infected by malware or compromised by attackers. The SRX Series device can download the infected host feed from the Juniper ATP Cloud or generate its own infected host feed based on the detection events from IDP. The SRX Series device can use the infected host feed to block or quarantine the traffic to or from the infected hosts based on the security policies1.
B) Command and Control feed. A command and control feed is a security intelligence feed that contains the IP addresses of servers that are used by malware or attackers to communicate with infected hosts.
The SRX Series device can download the command and control feed from the Juniper ATP Cloud or generate its own command and control feed based on the detection events from IDP. The SRX Series device can use the command and control feed to block or log the traffic to or from the command and control servers based on the security policies2.
The other options are incorrect because:
C) Custom feeds. Custom feeds are not a security intelligence feed type, but a feature that allows you to create your own security intelligence feeds based on your own criteria and sources. You can configure custom feeds by using the Junos Space Security Director or the CLI. Custom feeds are not supported by the Juniper ATP Cloud or the IDP3.
D) Malicious URL feed. Malicious URL feed is not a security intelligence feed type, but a feature that allows you to block or log the traffic to or from malicious URLs based on the security policies. The SRX Series device can download the malicious URL feed from the Juniper ATP Cloud or the Juniper Threat Labs. Malicious URL feed is not supported by the IDP4.
Reference: Infected Host Feed Overview Command and Control Feed Overview Custom Feed Overview Malicious URL Feed Overview
NEW QUESTION # 36
Your Source NAT implementation uses an address pool that contains multiple IPv4 addresses Your users report that when they establish more than one session with an external application, they are prompted to authenticate multiple times External hosts must not be able to establish sessions with internal network hosts What will solve this problem?
- A. Disable PAT.
- B. Enable address persistence.
- C. Enable persistent NAT
- D. Enable destination NAT.
Answer: C
NEW QUESTION # 37
Your customer needs embedded security in an EVPN-VXLAN solution.
What are two benefits of adding an SRX Series device in this scenario? (Choose two.)
- A. It adds extra security with the capabilities of an enterprise-grade firewall in the EVPN-VXLAN underlay.
- B. It adds extra security with the capabilities of an enterprise-grade firewall in the EVPN-VXLAN overlay.
- C. It enhances tunnel inspection for VXLAN encapsulated traffic with only Layer 4 security services.
- D. It enhances tunnel inspection for VXLAN encapsulated traffic with Layer 4-7 security services.
Answer: B,D
Explanation:
The SRX Series can inspect traffic within VXLAN tunnels, providing in-depth security services across multiple layers. Adding SRX in the overlay network allows comprehensive control, leveraging advanced firewall capabilities. For more details, see Juniper EVPN-VXLAN Security.
When integrating an SRX Series device into anEVPN-VXLANsolution, it offers several security benefits:
* Layer 4-7 Security Services (Answer A): The SRX can providedeep packet inspectionfor VXLAN encapsulated traffic, enhancing security by offering services such as intrusion prevention, application layer filtering, and antivirus scanning. This allows security monitoring of the encapsulated traffic at higher layers of the OSI model (Layers 4-7), which is essential for advanced threat detection.
* Security in the Overlay Network (Answer C): The SRX adds security by functioning as an enterprise- grade firewall within theEVPN-VXLAN overlay. This means that traffic flowing between virtualized segments or networks can be inspected and filtered using SRX firewall rules, ensuring that the VXLAN overlay remains secure.
These features make the SRX a powerful addition for securing EVPN-VXLAN environments, providing comprehensive security for encapsulated traffic and ensuring that both the underlay and overlay networks are protected.
NEW QUESTION # 38
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