What feature do Sub-Interfaces on the SonicWall provide?

Sub-interfaces on the SonicWall are designed to support VLANs (Virtual Local Area Networks). By enabling the configuration of multiple sub-interfaces on a single physical interface, SonicWall allows for the logical segmentation of network traffic. This means that you can effectively isolate different types of traffic within the same physical infrastructure, improving security and managing bandwidth more efficiently.

Each sub-interface can be assigned its own IP address, gateway, and security policies, making it possible to segregate traffic belonging to different departments, services, or user groups without requiring additional physical interfaces. This capability is particularly useful in environments where managing network resources and ensuring security between different segments is crucial.

The other options do not accurately reflect the primary function of sub-interfaces. While they could have connections to other functionalities, they are not the main purpose of sub-interfaces on SonicWall devices.