JNCIP-SEC JN0-636 Syllabus Exam Questions Answers

 You are connecting two remote sites to your corporate headquarters site. You must ensure that traffic passes through the corporate headquarters. In this scenario, the VPN that should be used is:

• D. Hub-and-spoke IPsec VPN with the corporate firewall acting as the hub device. A hub-and-spoke IPsec VPN is a type of VPN that connects multiple remote sites to a central site, or hub, over a public network. The hub site acts as a gateway for the remote sites and provides security and routing services. The remote sites, or spokes, communicate with each other through the hub site. The hub site and the spoke sites use IPsec tunnels to encrypt and authenticate the traffic between them. A hub-and-spoke IPsec VPN is suitable for connecting two remote sites to your corporate headquarters site, because it allows you to control the traffic flow and enforce security policies at the hub site. The corporate firewall can act as the hub device and provide IPsec VPN services to the remote sites1.

The other options are incorrect because:

• A. Full mesh IPsec VPNs with tunnels between all sites. A full mesh IPsec VPN is a type of VPN that connects every site to every other site over a public network. Each site has an IPsec tunnel with every other site, forming a mesh topology. A full mesh IPsec VPN provides direct and secure communication between any pair of sites, but it also requires a large number of IPsec tunnels and complex configuration. A full mesh IPsec VPN is not suitable for connecting two remote sites to your corporate headquarters site, because it does not ensure that traffic passes through the corporate headquarters site, and it may introduce unnecessary overhead and complexity2.
• B. A full mesh Layer 3 VPN with the BGP route reflector behind the corporate firewall device. A full mesh Layer 3 VPN is a type of VPN that uses MPLS and BGP to provide Layer 3 connectivity and routing between multiple sites over a service provider’s network. Each site has a BGP session with every other site, forming a full mesh topology. A BGP route reflector is a device that reduces the number of BGP sessions required in a full mesh topology by reflecting routes between its clients. A full mesh Layer 3 VPN with the BGP route reflector behind the corporate firewall device is not suitable for connecting two remote sites to your corporate headquarters site, because it does not ensure that traffic passes through the corporate firewall device, and it may require additional configuration and coordination with the service provider3.
• C. A Layer 3 VPN with the corporate firewall acting as the hub device. A Layer 3 VPN is a type of VPN that uses MPLS and BGP to provide Layer 3 connectivity and routing between multiple sites over a service provider’s network. A Layer 3 VPN can have different topologies, such as full mesh, hub-and-spoke, or partial mesh. A Layer 3 VPN with the corporate firewall acting as the hub device is not suitable for connecting two remote sites to your corporate headquarters site, because the corporate firewall may not support MPLS and BGP, and it may require additional configuration and coordination with the service provider3.

References:

• Hub-and-Spoke VPNs Overview
• Full Mesh VPNs Overview
• Layer 3 VPNs Overview

Source NAT is a type of NAT that is used to translate the source IP address and port number of a packet. This is typically used to allow multiple devices on a private network to access the internet using a single public IP address. In the exhibit, we can see that the source IP address and port number of the packet are being translated from 10.10.10.2/61606 to 203.0.113.100/179. This is a clear indication that Source NAT is being performed. References:

• Network Address Translation Feature Guide
• SRX NAT with Illustrated Examples

The security feature that bypasses routing or switching lookup is transparent mode. The other options are incorrect because:

• B. Secure wire is a feature that allows you to connect two interfaces on the same device and forward traffic between them without any processing. Secure wire does not bypass routing or switching lookup, but rather eliminates them altogether1.
• C. Mixed mode is a mode of operation for SRX Series devices that allows you to configure both transparent mode and switching mode on the same device. Mixed mode does not bypass routing or switching lookup, but rather uses them depending on the interface type2.
• D. MACsec (Media Access Control Security) is a feature that provides encryption and authentication for Layer 2 traffic. MACsec does not bypass routing or switching lookup, but rather operates at a lower layer3.

Therefore, the correct answer is A. Transparent mode is a mode of operation for SRX Series devices that provides Layer 2 bridging capabilities with full security services. In transparent mode, the SRX Series device acts as a bridge between two network segments and inspects the packets without modifying the source or destination information in the IP packet header. The SRX Series device does not have an IP address in transparent mode, except for the management interface. Transparent mode bypasses routing or switching lookup, because the SRX Series device does not perform any routing or switching functions, but rather forwards the packets based on the MAC addresses4.

References:

• Secure Wire Overview
• Mixed Mode Overview
• MACsec Overview
• Transparent Mode Overview

Juniper ATP Cloud is a cloud-based service that provides advanced threat prevention and detection for SRX Series devices. To enroll an SRX Series device with Juniper ATP Cloud, you need to have a valid license and authorization code, and you need to run a Junos OS op script on the device. The op script performs the following tasks:

• Downloads and installs certificate authority (CA) licenses onto your SRX Series device.
• Creates local certificates and enrolls them with the cloud server.
• Performs basic Juniper ATP Cloud configuration on the SRX Series device.
• Establishes a secure connection to the cloud server.

You can run the op script either by copying the CLI command from the Juniper ATP Cloud Web Portal and running it on the device, or by using the enroll command on the device. The op script is the only way to enroll an SRX Series device with Juniper ATP Cloud. You cannot enroll the device manually or by using other methods.

The other statements in the question are incorrect for the following reasons:

• If a device is already enrolled in a realm and you enroll it in a new realm, none of the device data or configuration information is propagated to the new realm. This includes history, infected hosts feeds, logging, API tokens, and administrator accounts. You can view and change the realm association of a device from the Realm Management page in the Juniper ATP Cloud Web Portal.
• The only way to enroll an SRX Series device is not to interact with the Juniper ATP Cloud Web Portal. You can also use the enroll command on the device, which performs all the necessary enrollment steps without requiring you to access the Web Portal.
• When the license expires, the SRX Series device is not disenrolled from Juniper ATP Cloud without a grace period. The device enters a grace period of 30 days, during which it can still send files to the cloud for inspection and receive threat intelligence feeds. After the grace period, the device is disenrolled and stops communicating with the cloud.

References:

• How to Enroll Your SRX Series Firewalls in Juniper Advanced Threat Prevention (ATP) Cloud Using Policy Enforcer
• Enroll an SRX Series Firewall using Juniper ATP Cloud Web Portal
• ATP Cloud | Step 2: Up and Running
• Enroll an SRX Series Firewall Using the CLI