Free Juniper JN0-637 Practice Exams - Page 2 of 6

Question #11

You are attempting to ping an interface on your SRX Series device, but the ping is unsuccessful.

What are three reasons for this behavior? (Choose three.)

A . The interface is not assigned to a security zone.
B . The interface’s host-inbound-traffic security zone configuration does not permit ping
C . The ping traffic is matching a firewall filter.
D . The device has J-Web enabled.
E . The interface has multiple logical units configured.

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Question #12

You have configured the backup signal route IP for your multinode HA deployment, and the ICL link fails.

Which two statements are correct in this scenario? (Choose two.)

A . The current active node retains the active role.
B . The active node removes the active signal route.
C . The backup node changes the routing preference to the other node at its medium priority.
D . The active node keeps the active signal route.

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Question #13

Which two statements describe the behavior of logical systems? (Choose two.)

A . Each logical system shares the routing protocol process.
B . A default routing instance must be manually created for each logical system
C . Each logical system has a copy of the routing protocol process.
D . A default routing instance is automatically created for each logical system.

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Question #14

Which two statements are correct about automated threat mitigation with Security Director? (Choose two.)

A . Infected hosts are tracked by their IP address.
B . Infected hosts are tracked by their chassis serial number.
C . Infected hosts are tracked by their MAC address.
D . Infected hosts are tracked by their user identity.

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Question #15

Which two statements are correct about automated threat mitigation with Security Director? (Choose two.)

A . It works with third-party switches.
B . It provides endpoint protection by running a Juniper ATP Cloud agent on the servers.
C . It provides endpoint protection by running a Juniper ATP Cloud agent on EX Series devices.
D . It works with SRX Series devices.

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Question #16

Click the Exhibit button.

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

A . You cannot secure intra-VLAN traffic with a security policy on this device.
B . You can secure inter-VLAN traffic with a security policy on this device.
C . The device can pass Layer 2 and Layer 3 traffic at the same time.
D . The device cannot pass Layer 2 and Layer 3 traffic at the same time.

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Correct Answer: A, D
A, D

Explanation:

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.

Question #17

Referring to the exhibit, which two statements are true?

A . Every VPN packet that the SRX receives from the VPN peer is outside the ESP sequence window
B . The SRX is sending traffic into the tunnel and out toward the VPN peer.
C . The SRX is not sending any packets to the VPN peer.
D . The SRX is not receiving any packets from the VPN peer.

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Question #18

You are asked to configure tenant systems.

Which two statements are true in this scenario? (Choose two.)

A . A tenant system can have only one administrator.
B . After successful configuration, the changes are merged into the primary database for each tenant system.
C . Tenant systems have their own configuration database.
D . You can commit multiple tenant systems at a time.

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Question #19

You configure two Ethernet interfaces on your SRX Series device as Layer 2 interfaces and add them to the same VLAN. The SRX is using the default L2-learning setting. You do not add the interfaces to a security zone.

Which two statements are true in this scenario? (Choose two.)

A . You are unable to apply stateful security features to traffic that is switched between the two interfaces.
B . You are able to apply stateful security features to traffic that enters and exits the VLAN.
C . The interfaces will not forward traffic by default.
D . You cannot add Layer 2 interfaces to a security zone.

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Question #20

You are deploying OSPF over IPsec with an SRX Series device and third-party device using GRE.

Which two statements are correct? (Choose two.)

A . The GRE interface should use lo0 as endpoints.
B . The OSPF protocol must be enabled under the VPN zone.
C . Overlapping addresses are allowed between remote networks.
D . The GRE interface must be configured under the OSPF protocol.

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Correct Answer: A, D
A, D

Explanation:

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

Understanding the Scenario:

Objective: Deploy OSPF over IPsec between an SRX Series device and a third-party device using GRE tunnels.

Components Involved:

GRE (Generic Routing Encapsulation): Encapsulates packets to allow routing protocols like OSPF to run over IPsec tunnels.

IPsec: Provides security for the GRE tunnels.

OSPF: Dynamic routing protocol used over the GRE tunnel.

Option A: The GRE interface should use lo0 as endpoints.

Using the loopback interface (lo0) as the source and destination endpoints for GRE tunnels is a

common best practice.

Advantages:

Stability: Loopback interfaces are always up, ensuring the GRE tunnel remains operational even if physical interfaces fail.

Reachability: Provides consistent endpoint IP addresses for GRE tunnels.

Configuration:

Assign IP addresses to lo0 interfaces on both devices.

Configure GRE tunnels to use these lo0 IP addresses as source and destination.

Reference: Juniper Networks Documentation:

"Using loopback interfaces as GRE tunnel endpoints ensures stability and consistent reachability for

routing protocols over GRE tunnels."

Source: Configuring GRE Tunnels

Option D: The GRE interface must be configured under the OSPF protocol.

To run OSPF over the GRE tunnel, the GRE interface must be included in the OSPF configuration.

Configuration Steps:

Create GRE Interface:

Example: set interfaces gr-0/0/0 unit 0 tunnel source <source-ip> tunnel destination <destination-ip>

Assign IP Address to GRE Interface:

Example: set interfaces gr-0/0/0 unit 0 family inet address <ip-address>

Include GRE Interface in OSPF:

Example: set protocols ospf area <area-id> interface gr-0/0/0.0

Result:

OSPF will establish adjacencies over the GRE interface and exchange routing information.

Reference: Juniper Networks Documentation:

"To enable OSPF over GRE tunnels, you must include the GRE interfaces in the OSPF configuration."

Source: OSPF over GRE Configuration

Why Options B and C are Incorrect:

Option B: The OSPF protocol must be enabled under the VPN zone.

Since OSPF is running over the GRE tunnel, which is encapsulated over IPsec, the OSPF packets are encapsulated within GRE and IPsec.

The SRX device does not need to allow OSPF in the security policies or enable OSPF under the VPN

zone for GRE-encapsulated traffic.

Security Policies:

The GRE traffic (IP protocol 47) must be permitted through the security policies.

OSPF runs inside the GRE tunnel and does not require additional configuration under the VPN zone.

Reference: Juniper Networks Documentation:

"When using GRE over IPsec, routing protocols run over GRE and do not require separate security policies for their control traffic."

Source: Security Policies for GRE over IPsec

Option C: Overlapping addresses are allowed between remote networks.

Overlapping IP addresses can cause routing conflicts and are generally not recommended.

In a GRE over IPsec scenario, overlapping addresses can lead to issues in routing protocol adjacency

and data forwarding.

Best Practice:

Ensure unique IP addressing schemes between remote networks to prevent routing issues.

Reference: Juniper Networks Documentation:

"Overlapping IP address spaces can lead to routing ambiguities and should be avoided when configuring GRE tunnels."

Source: Avoiding Overlapping IP Addresses

Conclusion:

Correct Answers: A and D

Rationale:

Option A is correct because using lo0 as endpoints for GRE provides stability and reliability.

Option D is correct because the GRE interface must be included in the OSPF configuration to enable OSPF over the tunnel.