Juniper Updated JN0-335 Exam Questions and Answers by lowri

• 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

 This is because the error message indicates that the client device does not trust the certificate authority that issued the certificate for the external server. Therefore, you need to import the root CA certificate from the SRX Series device to the client device and add it to the trusted certificate store. This will allow the client device to verify the identity of the SRX Series device and accept the certificates it generates for the external servers3.

The other options are not correct because:

• A. Load a known good, but expired. CA certificate onto the SRX Series device. This will not solve the problem because the client device will still reject the certificates from the SRX Series device if they are signed by an expired CA certificate. The expiration date of the CA certificate is one of the factors that the client device checks when validating the certificate2.
• B. Install a new SRX Series device to act as the client proxy. This will not solve the problem because the new SRX Series device will still need to have a root CA certificate configured and imported to the client devices. The problem is not with the SRX Series device itself, but with the trust relationship between the SRX Series device and the client devices2.
• C. Reboot the SRX Series device. This will not solve the problem because rebooting the SRX Series device will not change the configuration or the certificates on the SRX Series device or the client devices. The problem is not caused by a temporary glitch or a malfunction, but by a mismatch between the certificates on the SRX Series device and the client devices2.

I hope this helps you understand the problem and the solution better. If you want to learn more about SSL client protection proxy, you can check out the following references:

• SSL Proxy Overview
• Configuring SSL Forward Proxy
• Configuring a Root CA Certificate
• SSL Proxy - Client Protection

 Juniper ATP Cloud is a cloud-based service that provides advanced malware detection and prevention for the network. It uses machine learning to find and block both known and unknown cyberthreats, analyzing files and network traffic looking for signs of malicious behavior. One of the methods that Juniper ATP Cloud uses to identify zero-day threats is dynamic analysis, which is the process of executing suspicious files or code in a sandbox environment and observing their behavior and network activity. Dynamic analysis can uncover zero-day malware threats and malicious connections, including botnets and command-and-control servers hiding in encrypted traffic, by detecting anomalous or malicious patterns. Dynamic analysis is complemented by other methods, such as static analysis, which examines the file structure and content without executing it, and machine learning, which uses artificial intelligence to classify and predict threats based on previous data and models. References:

• [Juniper Advanced Threat Prevention Products] 1
• [Juniper Advanced Threat Prevention Datasheet] 2
• [Juniper Advanced Threat Prevention | NetworkScreen.com] 3
• [Introduction to Juniper ATP Cloud | ATP Cloud | Juniper Networks] 4
• [JUNIPER ADVANCED THREAT PREVENTION CLOUD SERVICES DESCRIPTION] 5

The cSRX is a containerized version of the SRX Series device that runs on Linux platforms. The cSRX has the following benefits for deploying in a virtual environment:

• The cSRX supports Layer 2 and Layer 3 deployments, which means it can operate as a transparent or a routed firewall. The cSRX can also support multiple routing instances and virtual routers2
• The cSRX supports firewall, NAT, IPS, and UTM services, which means it can provide comprehensive security features for protecting the virtual network. The cSRX can also support application identification, user firewall, and VPN services2

The cSRX default configuration does not contain three default zones: trust, untrust, and management. The cSRX default configuration contains only one zone: junos-host. The cSRX does not have low memory requirements. The cSRX requires at least 2 GB of memory and 2 CPU cores to run2 References:

• 1: Juniper Security Specialist (JNCIS-SEC) (JN0-334) | Study Guide 3
• 2: Junos OS Security Configuration Guide | cSRX Overview 4