Level 2 network security devices refer to
Each layer has a specific job, and together they make data transmission possible: Layer 1 (Physical): This is all about wires, ports, and electrical signals—pure hardware. Layer 2 (Data Link): This layer understands MAC addresses and creates point-to-point. Every computer requires an operating system to function, including computer-based network devices such as switches, routers, access points, and firewalls. The purpose of this paper is to recommend that industrial control system components using the widely accepted security standard ISA/IEC 62443-4-2, target conformance to a minimum of security level 2 (SL2), as defined in that standard. Network security devices provide automated functionality that can help stop network-based cyberattacks.
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