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JN0-637 New Study Materials & JN0-637 Practice Test Online

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Juniper Security, Professional (JNCIP-SEC) Sample Questions (Q27-Q32):

NEW QUESTION # 27
Click the Exhibit button.

Which type of NAT is shown in the exhibit?

A. NAT64
B. DS-Lite
C. NAT46
D. persistent NAT

Answer: A

NEW QUESTION # 28
You have an initial setup of ADVPN with two spokes and a hub. A host at partner Spoke-1 is sending traffic to a host at partner Spoke-2.
In this scenario, which statement is true?

A. Spoke-1 will send the traffic destined to Spoke-2 through the hub until the VPN is established between the spokes.
B. Spoke-1 will establish the tunnel to Spoke-2 before sending any of the host traffic.
C. Spoke-1 will establish a VPN to Spoke-2 when this is first deployed, so traffic will be sent immediately to Spoke-2.
D. Spoke-1 will send the traffic through the hub and not use a direct VPN to Spoke-2.

Answer: A

Explanation:
In an ADVPN (Auto-Discovery VPN) environment with a hub-and-spoke topology, the initial communication between two spokes (Spoke-1 and Spoke-2) is always routed through the hub. Once the hub detects the communication, it facilitates the creation of a direct VPN tunnel between the spokes. Until this dynamic tunnel is established, the traffic between the spokes continues to pass through the hub.
In this scenario,Spoke-1 will route traffic through the hubinitially until the direct VPN tunnel toSpoke-2is established.

NEW QUESTION # 29
Exhibit:

You are troubleshooting a new IPsec VPN that is configured between your corporate office and the RemoteSite1 SRX Series device. The VPN is not currently establishing. The RemoteSite1 device is being assigned an IP address on its gateway interface using DHCP.
Which action will solve this problem?

A. On both devices, change the IKE policy mode to aggressive.
B. On both devices, change the IKE policy proposal set to basic.
C. On the RemoteSite1 device, change the IKE gateway external interface to st0.0.
D. On both devices, change the IKE version to use version 2 only.

Answer: A

Explanation:
Aggressive mode is required when an IP address is dynamically assigned, such as through DHCP, as it allows for faster establishment with less identity verification. More details are available in Juniper IKE and IPsec Configuration Guide.
The configuration shown in the exhibit highlights that the RemoteSite1 SRX Series device is using DHCP to obtain an IP address for its external interface (ge-0/0/2). This introduces a challenge in IPsec VPN configurations when the public IP address of the remote site is not static, as is the case here.
Aggressive mode in IKE (Internet Key Exchange) is designed for situations where one or both peers have dynamically assigned IP addresses. In this scenario, aggressive mode allows the devices to exchange identifying information, such as hostnames, rather than relying on static IP addresses, which is necessary when the remote peer (RemoteSite1) has a dynamic IP from DHCP.
* Correct Action (D): Changing the IKE policy mode to aggressive will resolve the issue by allowing the two devices to establish the VPN even though one of them is using DHCP. In aggressive mode, the initiator can present its identity (hostname) during the initial handshake, enabling the VPN to be established successfully.
* Incorrect Options:
* Option A: Changing the external interface to st0.0 is incorrect because the st0 interface is used for the tunnel interface, not for the IKE negotiation.
* Option B: Changing to IKE version 2 would not resolve the dynamic IP issue directly, and IKEv1 works in this scenario.
* Option C: Changing the IKE proposal set to basic doesn't address the dynamic IP challenge in this scenario.
Juniper References:
* Juniper IKE and VPN Documentation: Provides details on when to use aggressive mode, especially when a dynamic IP address is involved.

NEW QUESTION # 30
Exhibit

You are trying to configure an IPsec tunnel between SRX Series devices in the corporate office and branch1. You have committed the configuration shown in the exhibit, but the IPsec tunnel is not establishing.
In this scenario, what would solve this problem.

A. Change the IKE mode to aggressive on the branch1 and corporate devices.
B. Add multipoint to the st0.0 interface configuration on the branch1 device.
C. Change the IKE proposal-set to compatible on the branch1 and corporate devices.
D. Change the local identity to inet advpn on the branch1 device.

Answer: D

NEW QUESTION # 31
You have deployed automated threat mitigation using Security Director with Policy Enforcer, Juniper ATP Cloud, SRX Series devices, Forescout, and third-party switches.
In this scenario, which device is responsible for communicating directly to the third-party switches when infected hosts need to be blocked?

A. Policy Enforcer
B. Juniper ATP Cloud
C. Forescout
D. SRX Series device

Answer: A

Explanation:
Policy Enforcer receives these policies and translates them into device-specific commands. It then communicates with the third-party switches (using protocols like SNMP, RADIUS, or vendor-specific APIs) to enforce those commands, such as blocking the infected hosts' MAC addresses or port access.
Why Policy Enforcer is the Right Choice:
* Centralized Enforcement: Policy Enforcer acts as the central point of enforcement for Security Director policies, ensuring consistent security across the network.
* Multi-Vendor Support: It can interact with a wide range of network devices, including switches from different vendors.
* Automation: Policy Enforcer automates the policy enforcement process, enabling rapid response to threats.

NEW QUESTION # 32
......

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