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Juniper Security, Professional (JNCIP-SEC) Sample Questions (Q76-Q81):
NEW QUESTION # 76
Exhibit.
A hub member of an ADVPN is not functioning correctly.
Referring the exhibit, which action should you take to solve the problem?
Answer: A
NEW QUESTION # 77
You are deploying a large-scale VPN spanning six sites. You need to choose a VPN technology that satisfies the following requirements:
All sites must have secure reachability to all other sites. New spoke sites can be added without explicit configuration on the hub site. All spoke-to-spoke communication must traverse the hub site.
Which VPN technology will satisfy these requirements?
Answer: D
Explanation:
AutoVPN simplifies deployment by dynamically establishing tunnels from spokes to the hub. This architecture supports easy scaling with minimal configuration changes, ensuring spoke-to-spoke traffic flows through the hub. For more information, see Juniper AutoVPN Overview.
In this scenario, you need a VPN solution that ensures secure, dynamic connectivity between multiple sites, with the following conditions:
All sites must have secure reachability.
New spoke sites can be added without explicit configuration on the hub site.
Spoke-to-spoke communication must traverse the hub.
The correct technology to meet these requirements is AutoVPN. It simplifies VPN configurations by automating the setup between hub and spoke sites. Additionally, AutoVPN automatically establishes secure tunnels for new spoke sites without requiring manual configuration at the hub, and all spoke- to-spoke traffic is routed through the hub.
NEW QUESTION # 78
Which two statements are true when setting up an SRX Series device to operate in mixed mode?
(Choose two.)
Answer: A,D
Explanation:
In mixed mode, SRX devices can simultaneously handle Layer 2 switching and Layer 3 routing, but a reboot is required when configuring Layer 2 and Layer 3 interfaces to ensure the configuration takes effect. Layer 2 packets are switched within the defined bridge domain. Further guidance on SRX mixed mode can be found at Juniper Mixed Mode Documentation.
When an SRX Series device is configured in mixed mode, both Layer 2 switching and Layer 3 routing functionalities can be used on the same device. This enables the SRX to act as both a router and a switch for different interfaces.
After configuring the SRX to operate with at least one Layer 2 interface and one Layer 3 interface, the device needs to be rebooted. This is required to properly initialize the mixed mode configuration, as the SRX needs to switch between Layer 2 and Layer 3 processing modes.
In mixed mode, traffic from Layer 2 interfaces is switched within the same bridge domain. A bridge domain defines a Layer 2 broadcast domain, and packets from Layer 2 interfaces are forwarded based on MAC addresses within that domain.
NEW QUESTION # 79
You need to set up source NAT so that external hosts can initiate connections to an internal device, but only if a connection to the device was first initiated by the internal device.
Which type of NAT solution provides this functionality?
Answer: A
Explanation:
Persistent NAT with target host allows external hosts to establish connections only when the internal device initiates a session first, ideal for specific interactive applications. Refer to Juniper Persistent NAT Documentation.
The scenario requires that external hosts be able to initiate a connectiononly if the internal device has already initiated a connection. The correct solution isPersistent NAT with target host, which ensures that a specific external host can initiate new connections back to the internal device, but only after the internal device has established a session first.
* Persistent NAT with Target Host (Answer C): This allows the internal device to initiate a connection, and once established, the specified external host can also initiate new connections to the internal device on the same NAT mapping.
Example Configuration:
bash
Copy code
set security nat source persistent-nat permit target-host-port
This solution is appropriate when controlled bidirectional communication is required based on an internal- initiated connection.
NEW QUESTION # 80
You must implement an IPsec VPN on an SRX Series device using PKI certificates for authentication.
As part of the implementation, you are required to ensure that the certificate submission, renewal, and retrieval processes are handled automatically from the certificate authority.
In this scenario, which statement is correct.
Answer: C
Explanation:
Certificate Renewal
The renewal of certificates is much the same as initial certificate enrollment except you are just replacing an old certificate (about to expire) on the VPN device with a new certificate. As with the initial certificate request, only manual renewal is supported. SCEP can be used to re-enroll local certificates automatically before they expire. Refer to Appendix D for more details.
NEW QUESTION # 81
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