The vSRX is a virtual security appliance that runs on a virtual machine. It provides firewall, VPN, and other security services in a virtualized environment.
The vSRX is based on a version of Junos OS that is optimized for virtualization. It runs on a Linux kernel and uses a KVM hypervisor. It supports VMware ESXi and KVM hypervisors. The vSRX has support for VMXNET3 vNICs, which are high-performance virtual network interfaces provided by VMware. These interfaces can provide higher throughput and lower CPU utilization than other virtual NIC types.

JIMS server is a Juniper Identity Management Service that collects user identity information from different authentication sources for SRX Series devices. It can connect to SRX Series devices and CSO platform in your network.
JIMS server is a service that protects corporate resources by authenticating and restricting user access based on roles. It connects to SRX Series devices and CSO platform to provide identity information for firewall policies. To reduce the load that JIMS server places on your network, you should connect JIMS to another SRX Series device. This way, you can distribute the identity information among multiple SRX Series devices and reduce network traffic.