JN0-335 Exam Dumps : Security, Specialist (JNCIS-SEC)

• Referring to the SRX Series flow module diagram shown in the exhibit, application security is processed at the Services ALGs stage. Application Layer Gateways (ALGs) are software components that enable the SRX Series device to provide application-level security for specific protocols and applications1.
• ALGs inspect the application layer payload of packets and perform various actions, such as modifying the payload, opening pinholes, creating sessions, applying security policies, and enforcing application-specific behavior12.
• ALGs are required for protocols and applications that embed IP address information or port numbers in the application layer data, that open secondary connections, or that are dynamically assigned ports1. Some examples of protocols and applications that require ALGs are FTP, SIP, H.323, RTSP, PPTP, and DNS2.
• ALGs are configured as part of the security policy and are applied to the traffic that matches the policy criteria. ALGs can also be enabled or disabled globally or per zone12.

References:

• 1: Application Layer Gateways Overview
• 2: Application Layer Gateways Feature Guide for Security Devices

 To create a security policy that will automatically add infected hosts to the infected hosts feed and block further communication through the SRX Series device, you need to add a security intelligence policy to the permit portion of the security policy. A security intelligence policy is a set of rules that defines the actions to be taken for traffic thatmatches a specific category of threat feeds, such as infected hosts, command and control servers, or botnets. By adding a security intelligence policy to the permit portion of the security policy, you can enable the SRX Series device to dynamically update the infected hosts feed based on the advanced anti-malware policy results, and block the traffic from or to the infected hosts. Options B, C, and D are not correct because they do not enable the automatic addition of infected hosts to the feed or the blocking of their communication. References: The answer can be verified from Juniper’s official documentation on security intelligence and advanced anti-malware available on their website. Here are some relevant links:

• Security Intelligence Feature Guide for Security Devices
• Advanced Anti-Malware Feature Guide for Security Devices
• Configuring Security Intelligence Policy on the SRX Series Device
• [Configuring Advanced Anti-Malware Policy on the SRX Series Device]

 To implement IPS on your SRX Series device, you need to download and install the IPS signature database. The IPS signature database contains the attack signatures and predefined attack groups that are used to detect and prevent intrusions. You can download the IPS signature database from the Juniper Networks website or from a local server. You can install the IPS signature database manually or automatically. You do not need to enroll the SRX Series device with Juniper ATP Cloud or reboot the SRX Series device to implement IPS34 References:

• Configuring the IPS Policy on SRX Series Devices Using NSM
• Installing SRX 1400 with IPS activation ??? | SRX - Juniper Networks
• Download an IPS Signature | J-Web for SRX Series 21.2 - Juniper Networks
• IPS Configuration (CLI) | Junos OS | Juniper Networks