JN0-637 Exam Dumps - Security, Professional (JNCIP-SEC)

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Question # 9

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

Which two statements are correct? (Choose two.)

The GRE interface should use lo0 as endpoints.

The OSPF protocol must be enabled under the VPN zone.

Overlapping addresses are allowed between remote networks.

The GRE interface must be configured under the OSPF protocol.

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Answer:

Explanation:

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

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.

Explanation:

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., Explanation:, 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 tunnel destination , Assign IP Address to GRE Interface:, Example: set interfaces gr-0/0/0 unit 0 family inet address , Include GRE Interface in OSPF:, Example: set protocols ospf area 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., Explanation:, 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., Explanation:, 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., ]

Question # 10

Exhibit:

Referring to the exhibit, which statement is true?

SRG1 is configured in hybrid mode.

The ICL is encrypted.

If SRG1 moves to peer 2, peer 1 will drop packets sent to the SRG1 interfaces.

If SRG1 moves to peer 2, peer 1 will forward packets sent to the SRG1 interfaces.

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Question # 11

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

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

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

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

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

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Question # 12

Click the Exhibit button.

Referring to the exhibit. SRX-1 and SRX-3 have to be connected using EBGP. The BGP configuration on SRX-1 and SRX-3 is verified and correct.

Which configuration on SRX-2 would establish an EBGP connection successfully between SRX-1 and SRX-3?

The host-inbound-traffic statements do not allow EBGP traffic to traverse SRX-2.

The security policy to allow SRX-1 and SRX-3 to communicate on TCP port 79 should be configured.

The security policy to allow SRX-1 and SRX-3 to communicate on TCP port 169 should be configured.

The security policy to allow SRX-1 and SRX-3 to communicate on TCP port 179 should be configured.

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Question # 13

Exhibit:

Which two statements are correct about the output shown in the exhibit. (Choose Two)

The data shown requires a traceoptions flag of basic-datapath.

The data shown requires a traceoptions flag of host-traffic.

The packet is dropped by the default security policy.

The packet is dropped by a configured security policy.

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Question # 14

Exhibit:

Referring to the exhibit, which technology would you use to provide communication between

IPv4 host1 and ipv4 internal host

DS-Lite

NAT444

NAT46

full cone NAT

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Question # 15

In a multinode HA environment, which service must be configured to synchronize between nodes?

Advanced policy-based routing

PKI certificates

IPsec VPN

IDP

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Question # 16

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?

Spoke-1 will establish a VPN to Spoke-2 when this is first deployed, so traffic will be sent immediately to Spoke-2.

Spoke-1 will send the traffic through the hub and not use a direct VPN to Spoke-2.

Spoke-1 will establish the tunnel to Spoke-2 before sending any of the host traffic.

Spoke-1 will send the traffic destined to Spoke-2 through the hub until the VPN is established between the spokes.

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JN0-637 Exam Dumps - Security, Professional (JNCIP-SEC)

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