Key details for this exam, checked against the published exam outline
Each question shows the correct answer and an explanation of why it is right
Exhibit:
Referring to the exhibit, which technology would you use to provide communication between
IPv4 host1 and ipv4 internal host
Which two statements about the differences between chassis cluster and multinode HA on
SRX series devices are true? (Choose Two)
Click the Exhibit button.
Referring to the exhibit, which two statements are correct? (Choose two.)
Comprehensive Detailed Step-by-Step Explanation with All Juniper Security Reference
Understanding the Exhibit:
The SRX device is operating in Transparent Mode, as indicated by:
Global Mode : Transparent bridge
Transparent Mode on SRX Devices:
Transparent Mode (Layer 2 Mode):
The SRX device acts as a Layer 2 switch.
Does not perform routing functions.
Security policies can be applied to inter-VLAN (Layer 2) traffic but not intra-VLAN traffic.
Cannot handle Layer 3 traffic simultaneously.
Option A: You cannot secure intra-VLAN traffic with a security policy on this device.
True.
In Transparent Mode, intra-VLAN traffic is switched within the VLAN and does not pass through the SRX firewall processing engine.
Therefore, security policies cannot be applied to intra-VLAN traffic.
Option B: You can secure inter-VLAN traffic with a security policy on this device.
False.
In Transparent Mode, all interfaces are in the same VLAN (unless VLAN tagging is configured).
Inter-VLAN routing is not possible as the device does not perform Layer 3 functions.
Option C: The device can pass Layer 2 and Layer 3 traffic at the same time.
False.
In Transparent Mode, the SRX device operates exclusively at Layer 2.
It cannot process Layer 3 traffic simultaneously.
Option D: The device cannot pass Layer 2 and Layer 3 traffic at the same time.
True.
The SRX device in Transparent Mode cannot handle both Layer 2 and Layer 3 traffic concurrently.
Key Points:
Intra-VLAN Traffic:
Traffic within the same VLAN.
In Transparent Mode, this traffic is switched and does not go through the firewall's security policies.
Inter-VLAN Traffic:
Traffic between different VLANs.
Requires routing capabilities (Layer 3).
In Transparent Mode, the SRX cannot perform routing functions.
Juniper Security Reference:
Juniper Networks Documentation:
'In transparent mode, the SRX Series device acts like a Layer 2 switch or bridge. Security policies cannot control intra-VLAN traffic because such traffic does not pass through the firewall.'
Source: Understanding Transparent Mode
'The device cannot perform both Layer 2 switching and Layer 3 routing simultaneously in transparent mode.'
Source: Transparent Mode Limitations
Conclusion:
Option A is correct because intra-VLAN traffic cannot be secured with security policies in Transparent Mode.
Option D is correct because the device cannot pass both Layer 2 and Layer 3 traffic at the same time when operating in Transparent Mode.
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.)
A. Enroll the SRX Series device with Juniper ATP Cloud. This is essential for the SRX to receive threat intelligence from ATP Cloud, enabling it to identify infected hosts and take action.
B. Use a third-party connector. In this specific scenario, a third-party connector is required to integrate the SRX with the third-party switch. While Juniper has native integration for its EX switches, a connector is necessary to communicate with and manage the third-party switch.
C. Deploy Security Director with Policy Enforcer. Security Director orchestrates the automated response, and Policy Enforcer translates the policies into device-specific commands for the SRX and the third-party switch (via the connector).
Which two statements are true regarding NAT64? (Choose two.)
Comprehensive Detailed Step-by-Step Explanation with All Juniper Security Reference
Understanding NAT64:
NAT64 allows IPv6-only clients to communicate with IPv4 servers by translating IPv6 addresses to IPv4 addresses and vice versa.
It is essential in environments where IPv6 clients need access to IPv4 resources.
Flow-Based vs. Packet-Based Forwarding Modes:
Flow-Based Forwarding Mode:
The SRX device processes packets based on the session state.
Supports advanced services like NAT, IDP, and ALG.
Packet-Based Forwarding Mode:
The SRX device processes each packet individually without maintaining session state.
Limited support for advanced services.
Option A: An SRX Series device should be in flow-based forwarding mode for IPv4.
True.
NAT64 requires flow-based mode for IPv4 traffic to properly translate and maintain session states.
Option B: An SRX Series device should be in packet-based forwarding mode for IPv4.
False.
Packet-based mode does not support NAT features.
Option C: An SRX Series device should be in packet-based forwarding mode for IPv6.
False.
Similar to IPv4, NAT64 requires flow-based mode for IPv6 traffic.
Option D: An SRX Series device should be in flow-based forwarding mode for IPv6.
True.
Flow-based mode is necessary for NAT64 to handle IPv6 traffic correctly.
Key Points:
NAT64 Requires Flow-Based Mode:
Both IPv4 and IPv6 interfaces involved in NAT64 must be configured in flow-based mode.
This is because NAT64 relies on session information and stateful packet inspection.
Packet-Based Mode Limitations:
Does not support NAT, as it lacks session awareness.
Not suitable for NAT64 operations.
Juniper Security Reference:
Juniper Networks Documentation:
'NAT64 is supported only in flow-based processing mode.'
Source: Configuring NAT64
Understanding Flow-Based and Packet-Based Modes:
'Flow-based mode is required for stateful services such as NAT.'
Source: Flow-Based and Packet-Based Processing
Conclusion:
To implement NAT64 on an SRX Series device, both IPv4 and IPv6 traffic must be processed in flow-based forwarding mode.
Therefore, Options A and D are the correct statements.
115 questions covering all exam domains, starting from $20
Exam domains verified against: Official Juniper JN0-637 exam guide, last checked September 2026.
Use logging and tracing tools to diagnose security policy and zone issues in logical and tenant systems. Develop proficiency in monitoring outputs and identifying configuration problems that affect traffic flow and access control.
Configure and manage logical systems with multiple routing instances and administrative roles. Understand tenant system architecture, capacity planning, and the communication patterns between primary and tenant administrators.
Deploy transparent mode, mixed mode, secure wire, and MACsec in Layer 2 environments. Configure and monitor EVPN-VXLAN security to protect switched networks and prevent unauthorized access at the data link layer.
Sample question from this domain above: Q4
Implement persistent NAT, DNS doctoring, and IPv6 NAT in complex network scenarios. Troubleshoot NAT configuration issues and monitor address translation to ensure proper traffic flow and application functionality.
Configure hub-and-spoke VPN topologies and auto discovery VPNs with PKI. Handle overlapping IP addresses and troubleshoot IPsec tunnel issues in enterprise VPN deployments with multiple remote sites.
Design and deploy policy-based routing profiles and policies across routing instances. Configure various APBR options to direct traffic based on source, destination, and other criteria to achieve granular traffic management.
Sample question from this domain above: Q1
Distinguish between chassis clusters and multinode HA deployments and their architectural differences. Configure service redundancy groups and active node behavior to ensure continuous availability of security services.
Sample question from this domain above: Q5
Integrate third-party and multi-cloud threat intelligence services with Juniper security platforms. Implement automated response mechanisms to block threats and enforce secure enterprise security practices.
Common questions about the exam itself
