What deployment mode should be used for an NGFW connected between an existing firewall and a core switch to reduce intrusiveness?

Using a virtual wire deployment mode for a Next-Generation Firewall (NGFW) positioned between an existing firewall and a core switch is particularly advantageous for minimizing network disruption and preserving existing architectures. In this mode, the NGFW operates transparently, facilitating traffic filtering without needing to change the network topology or reconfigure IP addressing.

The virtual wire configuration effectively allows the NGFW to inspect and control the traffic flow in a manner akin to a bump-in-the-wire solution. This means it can monitor and secure the traffic without intervening in the fundamental design of the network. As a result, operations can continue without the complexities or potential downtime associated with more intrusive setup methods.

This deployment method is ideal when the goal is to augment security measures without significant alterations to existing firewall setups and network paths, ensuring a seamless integration that enhances security while maintaining operational integrity.