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Juniper JN0-637: Security - Professional (JNCIP-SEC)

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Question 1

You configured two SRX series devices in an active/passive multimode HA setup. In this scenario, which statement is correct?

A. Both devices are in the passive state until the activeness determination process is completed.

B. Both devices start in a hold state until the activeness determination process is completed.

C. Both devices start in the undiscovered state until the activeness determination process is completed.

D. Both devices are in the active state until the activeness determine determination process is completed.

Correct Answer:D

Question 2

You are using AutoVPN to deploy a hub-and-spoke VPN to connect your enterprise sites. In this scenario, which two statements are true? (Choose two.)

A. New spoke sites can be added without explicit configuration on the hub.

B. Direct spoke-to-spoke tunnels can be established automatically.

C. All spoke-to-spoke IPsec communication will pass through the hub.

D. AutoVPN requires OSPF over IPsec to discover and add new spokes.

Correct Answer:AC

Question 3

Referring to the exhibit,
JN0-637 dumps exhibit
which statement about TLS 1.2 traffic is correct?

A. TLS 1.2 traffic will be sent to routing instance R1 but not forwarded to the next hop.

B. TLS 1.2 traffic will be sent to routing instance R1 and forwarded to next hop 10.1.0.1.

C. TLS 1.2 traffic will be sent to routing instance R2 but not forwarded to the next hop.

D. TLS 1.2 traffic will be sent to routing instance R2 and forwarded to next hop 10.2.0.1.

Correct Answer:A

Question 4

You are setting up multinode HA for redundancy.
Which two statements are correct in this scenario? (Choose two.)

A. Dynamic routing is active on one device at a time.

B. Dynamic routing is active on both devices.

C. Physical connections are used for the control and fabric links.

D. ICL links require Layer 3 connectivity between peers.

Correct Answer:AC
Comprehensive Detailed Step-by-Step Explanation with All Juniper Security References
Understanding Multinode HA:
✑ Chassis Cluster in Active/Passive Mode:
✑ Dynamic Routing Protocols:
Option A: Dynamic routing is active on one device at a time.
✑ Explanation:
Reference:
"In a chassis cluster, the primary node handles all control plane tasks, including dynamic routing."
Source: Juniper TechLibrary - Chassis Cluster Overview
Option C: Physical connections are used for the control and fabric links.
* Explanation:
Control and fabric links are direct physical connections between cluster nodes.
Reference:
"The control and fabric links must be connected using physical interfaces between the nodes."
Source: Juniper TechLibrary - Chassis Cluster Components
Why Options B and D are Incorrect:
Option B: Dynamic routing is not active on both devices simultaneously in active/passive mode.
Option D: The Inter-Cluster Link (ICL) uses Layer 2 connectivity, not Layer 3.
Conclusion:
The correct options are A and C.

Question 5

Click the Exhibit button.
JN0-637 dumps exhibit
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.

Correct Answer:AD
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:
Transparent Mode on SRX Devices:
✑ Transparent Mode (Layer 2 Mode):
✑ Option A: You cannot secure intra-VLAN traffic with a security policy on this
device.
✑ Option B: You can secure inter-VLAN traffic with a security policy on this device.
✑ Option C: The device can pass Layer 2 and Layer 3 traffic at the same time.
✑ Option D: The device cannot pass Layer 2 and Layer 3 traffic at the same time.
Key Points:
✑ Intra-VLAN Traffic:
✑ Inter-VLAN Traffic:
Juniper Security References:
✑ Juniper Networks Documentation:
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 6

Which two statements are true regarding NAT64? (Choose two.)

A. An SRX Series device should be in flow-based forwarding mode for IPv4.

B. An SRX Series device should be in packet-based forwarding mode for IPv4.

C. An SRX Series device should be in packet-based forwarding mode for IPv6.

D. An SRX Series device should be in flow-based forwarding mode for IPv6.

Correct Answer:AD
Comprehensive Detailed Step-by-Step Explanation with All Juniper Security References
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:
✑ Packet-Based Forwarding Mode:
✑ Option A: An SRX Series device should be in flow-based forwarding mode for IPv4.
✑ Option B: An SRX Series device should be in packet-based forwarding mode for
IPv4.
✑ Option C: An SRX Series device should be in packet-based forwarding mode for IPv6.
✑ Option D: An SRX Series device should be in flow-based forwarding mode for
IPv6.
Key Points:
✑ NAT64 Requires Flow-Based Mode:
✑ Packet-Based Mode Limitations:
Juniper Security References:
✑ Juniper Networks Documentation:
✑ Understanding Flow-Based and Packet-Based Modes:
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.

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