The vSRX Virtual Firewall, as a virtualized network function (VNF), is designed for agile and dynamic environments like software-defined networks (SDNs). One of its primary benefits is scalability (A); instances can be rapidly deployed, scaled up, or scaled out to match changing traffic loads and security requirements programmatically. Furthermore, the vSRX provides granular security (C) by leveraging the full suite of Junos OS security features, including AppSecure, intrusion prevention systems (IPS), and advanced policy controls. This allows for detailed traffic inspection and the enforcement of specific security policies, which is critical for implementing micro-segmentation and zero-trust security models within an SDN architecture.

B. no required software license: The vSRX is a commercial product that requires a license to operate and to enable specific features and performance levels.

D. infinite number of interfaces: The number of virtual interfaces on a vSRX is finite and limited by the hypervisor and the specific vSRX software version.

1. Juniper Networks

vSRX Virtual Firewall Data Sheet. This document explicitly highlights the benefits of vSRX. It states

"The vSRX provides a flexible

scalable security solution..." and details its "full next-generation firewall (NGFW) capabilities

" which enable granular security control. (Reference: vSRX Virtual Firewall Data Sheet

"Product Description" and "Features and Benefits" sections).

2. Juniper Networks

"Understanding vSRX with VMware NSX." This documentation

while specific to NSX

describes the role of vSRX in an SDN environment. It emphasizes the ability to "dynamically insert and scale advanced security services

" confirming both scalability and the application of granular security policies in a virtualized network. (Reference: Juniper TechLibrary

"Understanding vSRX with VMware NSX" documentation

Overview section).

3. Juniper Networks

"Contrail Security Overview." In the context of Juniper's own SDN solution

Contrail

the documentation explains how virtual security appliances like the vSRX are used in service chains to provide scalable

on-demand

and detailed (granular) security services for virtual networks. (Reference: Juniper TechLibrary

"Contrail Security Overview

" Service Chaining section).