Switches are based on which type of hardware to support filtering decisions?

• A. Hardware/ASICs
• B. Software-based controllers
• C. Cloud-based virtual switches
• D. FPGA cores

Answer: (A)

Switches handle filtering and forwarding at very high speeds by using specialized hardware designed for packet processing. The typical choice is ASICs—Application-Specific Integrated Circuits—that are built to perform lookups (such as MAC addresses, VLANs, and ACLs) and make forwarding decisions in hardware. This lets the switch examine packet headers and decide where to send a frame in a single pass, achieving line-rate performance with low latency.

Software-based controllers and cloud-based virtual switches run on general-purpose CPUs or in virtualized environments, which can be slower for forwarding tasks even though they offer flexibility. FPGA cores can be used for programmable hardware acceleration, but the standard foundational hardware for filtering decisions in most switches is the ASIC.