Free Juniper JN0-637 Practice Exam with Questions & Answers | Set: 3

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Questions 21

Which role does an SRX Series device play in a DS-Lite deployment?

Options:

Softwire concentrator

STUN server

STUN client

Softwire initiator

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14-Jun-2025

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Questions 22

Click the Exhibit button.

JN0-637 Question 22

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

Options:

You cannot secure intra-VLAN traffic with a security policy on this device.

You can secure inter-VLAN traffic with a security policy on this device.

The device can pass Layer 2 and Layer 3 traffic at the same time.

The device cannot pass Layer 2 and Layer 3 traffic at the same time.

Answer:

A, D

Explanation:

Comprehensive Detailed Step-by-Step Explanation with All Juniper Security References

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 References:

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.

Questions 23

What are three requirements to run OSPF over GRE over IPsec? (Choose Three)

Options:

The GRE interface must be configured in OSPF Area 0.

The OSPF interface must be placed in a zone and must have GRE configured

Overlapping addresses should exist between remote networks.

The GRE interface must be placed in a zone and must have OSPF configured in is host

Overlapping addresses should not exist between remote networks.

Questions 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.)

Options:

address persistence

STUN

persistent NAT

double NAT

Questions 25

Which two statements are correct about advanced policy-based routing?

Options:

It can use the application system cache to route traffic.

The associated routing instance should be configured as a virtual router instance.

It cannot use the application system cache to route traffic.

The associated routing instance should be configured as a forwarding instance.

Questions 26

You are asked to establish IBGP between two nodes, but the session is not established. To troubleshoot this problem, you configured trace options to monitor BGP protocol message exchanges.

JN0-637 Question 26

Referring to the exhibit, which action would solve the problem?

Options:

Add the junos-host zone policy to permit the BGP packets.

Add a firewall filter to lo0 that permits the BGP packets.

Modify the security policy to permit the BGP packets.

Add BGP to the lo0 host-inbound-traffic configuration.

Questions 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.)

Options:

Use an external router.

Use an interconnect VPLS switch.

Use a secure wire.

Use a point-to-point logical tunnel.

Questions 28

You are attempting to ping the IP address that is assigned to the loopback interface on the

SRX series device shown in the exhibit.

JN0-637 Question 28

What is causing this problem?

Options:

The loopback interface requires encapsulation.

The loopback interface is not assigned to a security zone.

The incorrect interface index ID is assigned to the loopback interface.

The IP address on the loopback interface is a private address.

Questions 29

You are configuring advanced policy-based routing. You have created a static route with next

hop of an interface in your inet.0 routing table

JN0-637 Question 29

Referring to the exhibit, what should be changed to solve this issue?

Options:

You should change the routing instance type to virtual-router.

You should move the static route configuration to the main routing instance.

You should move the inet. o table before the routing instance table in your rib-groups configuration.

You should delete the interface-routes configuration under the routing-options hierarchy.

Questions 30

You have a multinode HA default mode deployment and the ICL is down.

In this scenario, what are two ways that the SRX Series devices verify the activeness of their peers? (Choose two.)

Options:

Custom IP addresses may be configured for the activeness probe.

Fabric link heartbeats are used to verify the activeness of the peers.

Each peer sends a probe with the virtual IP address as the destination IP address.

Each peer sends a probe with the virtual IP address as the source IP address and the upstream router as the destination IP address.

Answer:

A, D

Explanation:

Comprehensive Detailed Step-by-Step Explanation with All Juniper Security References

Understanding the Scenario:

Multinode HA Default Mode Deployment:

In a chassis cluster, two SRX devices operate together to provide high availability.

ICL (Inter-Cluster Link) is Down:

The control and fabric links between the nodes are not operational.

Objective:

Determine how the SRX devices verify each other's activeness without the ICL.

Option A: Custom IP addresses may be configured for the activeness probe.

Explanation:

When the control link is down, SRX devices use an ICMP ping-based activeness probe to check the peer's status.

Custom IP addresses can be configured as probe targets to verify the peer's activeness.

[Reference:, "You can configure the SRX Series device to send activeness probes to a configured IP address to verify the peer's state when the control link is down.", Source: Juniper Networks Documentation - Control Link Failure Detection, Option D: Each peer sends a probe with the virtual IP address as the source IP address and the upstream router as the destination IP address., Explanation:, The SRX devices send ICMP probes to an upstream device using the redundancy group's virtual IP address as the source., This helps determine if the peer node is still active by verifying network reachability., Reference:, "When the control link fails, each node sends ICMP pings to the configured probe addresses using the redundancy group's virtual IP address as the source.", Source: Juniper Networks Documentation - Chassis Cluster Control Link Failure, Why Options B and C are Incorrect:, Option B: Fabric link heartbeats cannot be used because the ICL (which includes the fabric link) is down., Option C: Probes are sent to upstream devices, not using the virtual IP address as the destination., Conclusion:, The correct options are A and D because they accurately describe how SRX devices verify activeness without the ICL., ]

Exam Code: JN0-637

Certification Provider: Juniper

Exam Name: Security - Professional (JNCIP-SEC)

Last Update: Jul 19, 2025

Questions: 115