The two types of system logs that Junos generates are control plane logs and data plane logs. Control plane logs are generated by the Junos operating system and contain system-level events such as system startup and shutdown, configuration changes, and system alarms. Data plane logs are generated by the network protocol processes and contain messages about the status of the network and its components, such as routing, firewall, NAT, and IPS. SQL log files and system core dump files are not types of system logs generated by Junos.

Scalability: vSRX instances can be easily added or removed as the needs of the network change, making it a flexible option for scaling in a software-defined network.
Granular Security: vSRX allows for granular security policies to be enforced at the virtual interface level, making it an effective solution for securing traffic in a software-defined network.
The two benefits of using a vSRX in a software-defined network are scalability and granular security. Scalability allows you to increase the number of resources available to meet the demands of network traffic, while granular security provides a level of control and flexibility to your network security that is not possible with a traditional firewall. With a vSRX, you can create multiple levels of security policies, rules, and access control lists to ensure that only authorized traffic can enter and exit your network. Additionally, you would not require a software license to use the vSRX, making it an economical solution for those looking for increased security and flexibility.