QUESTION: 61

A company has acquired a new branch office that has the same address space of one of its local networks, 192.168.100/24. The offices need to communicate with each other.
Which two NAT configurations will satisfy this requirement? (Choose two.)

[edit security nat source]
user@OfficeA# show rule-set OfficeBtoA {
from zone OfficeB;
to zone OfficeA;
rule 1 {
match {
source-address 192.168.210.0/24;
destination-address 192.168.200.0/24;
}
then {
source-nat {
interface;
}
}
}
}
[edit security nat static]
user@OfficeA# show rule-set From-Office-B {
from interface ge-0/0/0.0;
rule 1 {
match {
destination-address 192.168.200.0/24;

}
then {
static-nat {
prefix 192.168.100.0/24;
}
}
}
}
[edit security nat static]
user@OfficeB# show rule-set From-Office-A {
from interface ge-0/0/0.0;
rule 1 {
match {
destination-address 192.168.210.0/24;
}
then {
static-nat {
prefix 192.168.100.0/24;
}
}
}
}
[edit security nat source]
user@OfficeB# show rule-set OfficeAtoB {
from zone OfficeA;
to zone OfficeB;
rule 1 {
match {
source-address 192.168.200.0/24;
destination-address 192.168.210.0/24;
}
then {
source-nat {
interface;
}
}
}
}

Answer(s): A,D

Explanation:

The problem describes two offices needing to communicate, but both share the same IP address space, 192.168.100.0/24. To resolve this, NAT must be configured to translate the conflicting address spaces on each side. Here's how each of the configurations works:

Option A (Correct):
This source NAT rule translates the source address of traffic from Office B to Office A. By configuring source NAT, the source IP addresses from Office B (192.168.210.0/24) will be translated when communicating with Office A (192.168.200.0/24). This method ensures that there is no overlap in address space when packets are transmitted between the two offices.
Option D (Correct):
This is a source NAT rule configured on Office B, which translates the source addresses from Office A to prevent address conflicts. It ensures that when traffic is initiated from Office A to Office B, the overlapping address range (192.168.100.0/24) is translated.
Options B and C (Incorrect):
These options involve static NAT rules that map address ranges between the two offices, but they do not resolve the overlapping IP address space issue effectively. Static NAT is not the optimal solution in this scenario since the problem involves address space conflict, which requires translation of source addresses during communication.
Juniper

Reference:

Juniper NAT Configuration Guide: Detailed instructions on how to configure source NAT and resolve address conflicts between networks.

Reveal Solution Next Question

QUESTION: 62

Referring to the exhibit,

which two statements are correct about the NAT configuration? (Choose two.)

Both the internal and the external host can initiate a session after the initial translation.
Only a specific host can initiate a session to the reflexive address after the initial session.
Any external host will be able to initiate a session to the reflexive address.
The original destination port is used for the source port for the session.

Answer(s): A,B

Reveal Solution Next Question

QUESTION: 63

You are asked to establish a hub-and-spoke IPsec VPN using an SRX Series device as the hub. All of the spoke devices are third-party devices.
Which statement is correct in this scenario?

You must ensure that you are using aggressive mode when incorporating third-party devices as your spokes.
You must statically configure the next-hop tunnel binding table entries for each of the third-party spoke devices.
You must create a policy-based VPN on the hub device when peering with third-party devices.
You must always peer using loopback addresses when using non-Junos devices as your spokes.

Answer(s): B

Reveal Solution Next Question

QUESTION: 64

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?

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

Answer(s): D

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

Reference:

Juniper IKE and VPN Documentation: Provides details on when to use aggressive mode, especially when a dynamic IP address is involved.

Reveal Solution Next Question

Free JN0-637 Exam Braindumps (page: 16)

QUESTION: 61

Explanation:

Reference:

QUESTION: 62

QUESTION: 63

QUESTION: 64

Explanation:

Reference: