Juniper JN0-335 Exam Actual Questions

Application identification is a feature that enables SRX Series devices to identify and classify network traffic based on application signatures or custom rules. Application identification can enhance security, visibility, and control over network applications. Two statements that are true about application identification are:

Application identification can identify nested applications that are within Layer 7: Nested applications are applications that run within another application protocol, such as HTTP or SSL. For example, Facebook or YouTube are nested applications within HTTP. Application identification can identify nested applications by inspecting the application payload and matching it against predefined or custom signatures.

Application signatures are not the same as IDP signatures: Application signatures are patterns of bytes or strings that uniquely identify an application protocol or a nested application. IDP signatures are patterns of bytes or strings that indicate an attack or an exploit against a vulnerability. Application signatures are used for application identification and classification, while IDP signatures are used for intrusion detection and prevention.

The sequence that an SRX Series device uses when implementing stateful session security policies using Layer 3 routes is:

An SRX Series device will conduct a longest-match Layer 3 route table lookup before performing a security policy search: When an SRX Series device receives a packet, it first looks up the destination IP address in the routing table and finds the longest matching route to forward the packet. Then, it performs a security policy search based on the source zone, destination zone, source address, destination address, protocol, and application of the packet. If there is a matching policy that allows the packet, it creates or updates a session entry for the packet and applies any security services configured in the policy.

The logging parameter that will provide the function of showing tabular data for operational mode commands is count. The count parameter displays the number of packets and bytes that match a security policy and the action taken by the policy. The count parameter can be used with the show security policies hit-count command to display the policy counters in a tabular format. The count parameter can also be used with the show security flow session command to display the session counters in a tabular format.Reference:=show security policies hit-count,show security flow session

Two benefits of using a cSRX in your virtual environment are:

The cSRX supports firewall, NAT, IPS, and UTM services: The cSRX is a containerized version of the SRX Series firewall that runs as a Docker container on Linux hosts. It provides the same features and functionality as the SRX Series physical firewalls, such as firewall, NAT, IPS, and UTM services. The cSRX can protect your virtual workloads and applications from various threats and attacks.

The cSRX has low memory requirements: The cSRX is designed to be lightweight and efficient, with low memory and CPU requirements. The cSRX can run on as little as 1 GB of RAM and 1 vCPU, making it suitable for resource-constrained environments.

The service that you would implement at your edge device to prioritize VoIP traffic in this scenario is AppQoS. AppQoS is a feature that enables you to allocate bandwidth and prioritize traffic based on application signatures or custom rules. AppQoS can enhance the quality of service and experience for critical or latency-sensitive applications, such as VoIP. You can configure AppQoS policies to assign different classes of service (CoS) values or queue numbers to different applications or traffic flows. You can also define bandwidth limits, guarantees, or bursts for each class or queue.Reference:= [Application Quality of Service Overview], [Configuring Application Quality of Service]