Juniper Updated JN0-636 Exam Questions and Answers by blair

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

You must set up a DDoS solution for your ISP. The solution must be agile and not block legitimate traffic. The two products that will accomplish this task are:

• B. MX Series device. MX Series devices are high-performance routers that can provide DDoS protection at the network edge by integrating with Corero SmartWall Threat Defense Director (TDD) software. MX Series devices can leverage the packet processing capabilities of the MX-SPC3 Services Card to perform real-time DDoS detection and mitigation at line rate, scaling from 50 Gbps to 40 Tbps. MX Series devices can also use Juniper Networks Security Intelligence (SecIntel) to receive threat intelligence feeds from Juniper ATP Cloud or Juniper Threat Labs and apply them to the security policies. MX Series devices can provide an agile and effective DDoS solution for your ISP without blocking legitimate traffic12.
• C. Corero SmartWall TDD. Corero SmartWall TDD is a software solution that runs on MX Series devices and PTX Series devices to provide DDoS protection at the network edge. Corero SmartWall TDD uses behavioral analytics and detailed network visibility to detect and block DDoS attacks in seconds, without affecting the normal traffic. Corero SmartWall TDD can also provide advanced protection from “carpet bombing” attacks, 5G DDoS visibility, and multi-tenant portal for as-a-service offerings or views by department within an enterprise. Corero SmartWall TDD can provide an agile and effective DDoS solution for your ISP without blocking legitimate traffic34.

The other options are incorrect because:

• A. Contrail Insights. Contrail Insights is a software solution that provides network analytics and visibility for cloud and data center environments. Contrail Insights can help you monitor, troubleshoot, and optimize the performance and security of your network, but it does not provide DDoS protection by itself. Contrail Insights can integrate with other Juniper products, such as Contrail Enterprise Multicloud, Contrail Service Orchestration, and AppFormix, to provide a comprehensive network management solution, but it is not a DDoS solution for your ISP5.
• D. SRX Series device. SRX Series devices are high-performance firewalls that can provide DDoS protection at the network perimeter by integrating with Juniper ATP Cloud and Juniper Threat Labs. SRX Series devices can use SecIntel to receive threat intelligence feeds from Juniper ATP Cloud or Juniper Threat Labs and apply them to the security policies. SRX Series devices can also use IDP to detect and prevent application-level attacks, such as SQL injection, cross-site scripting, and buffer overflow. SRX Series devices can provide a robust and effective DDoS solution for your network, but they are not designed to handle high-volume DDoS attacks at the network edge, as MX Series devices and Corero SmartWall TDD are .

References:

• Juniper and Corero Joint DDoS Protection Solution
• MX-SPC3 Services Card Overview
• Corero SmartWall Threat Defense Director (TDD)
• Juniper Networks and Corero: A Modern Approach to DDoS Protection at Scale
• Contrail Insights Overview
• [SRX Series Services Gateways]
• [Juniper Networks Security Intelligence (SecIntel)]

According to the exhibit, which is a configuration snippet of the SRX Series device, the global mode for the device is set to switching mode. This means that the device is operating as a Layer 2 switch and does not apply any security policies to the traffic between hosts in the same broadcast domain1. Therefore, the traffic between two hosts in the same broadcast domain are not matching any security policies.

To solve this problem, the user should change the global mode to transparent bridge mode. This means that the device will operate as a Layer 2 transparent bridge and apply security policies to the traffic between hosts in the same broadcast domain2. This will allow the user to enforce security policies based on the source and destination IP addresses, ports, and protocols of the traffic.

To change the global mode to transparent bridge mode, the user should use the following command:

set protocols l2-learning global-mode transparent-bridge

This command will set the global mode for the SRX Series device as Layer 2 transparent bridge mode. After changing the mode, the user must reboot the device for the configuration to take effect2.

References: 1: global-mode (Protocols) 2: Configuring Layer 2 Transparent Mode

The output shown in the exhibit is from the command “show security flow session family inet6”. This command displays the IPv6 flow sessions on the SRX Series device. The output shows that there are two total sessions, both of which are valid. This means that the SRX Series device is configured with flow-based IPv6 forwarding options. Flow-based IPv6 forwarding options enable the device to process IPv6 packets using the security policies, NAT, and other security features. To configure flow-based IPv6 forwarding options, use the command set security forwarding-options family inet6 mode flow-based and reboot the device. References:

• show security flow session family inet6
• Configuring Flow-Based IPv6 Forwarding Options
• SRX Getting Started - Configure IPv6