What is a switch in networking?

What is a switch in networking?

• A. A device that connects devices within a local area network (LAN).
• B. A device that routes traffic between multiple networks.
• C. A device that provides wireless access to devices.
• D. A device that filters and blocks traffic.

Answer: (A)

A switch is a network device that connects devices within a local area network. It mainly works at the data link layer, learning each device’s MAC address on its ports and building a MAC address table. When a frame arrives, the switch uses that table to forward the frame only to the port where the destination device is connected, or it floods if it doesn’t yet know the destination. This targeted forwarding reduces unnecessary traffic and creates a separate collision domain for each connected device, improving network efficiency. The other described devices have different roles: a router connects and routes traffic between different networks; a wireless access point provides wireless connectivity; a device that filters traffic is a firewall or similar security appliance. Some switches offer extra security features, but their primary purpose is to interconnect devices within the same LAN.

A switch is a network device that connects devices within a local area network. It mainly works at the data link layer, learning each device’s MAC address on its ports and building a MAC address table. When a frame arrives, the switch uses that table to forward the frame only to the port where the destination device is connected, or it floods if it doesn’t yet know the destination. This targeted forwarding reduces unnecessary traffic and creates a separate collision domain for each connected device, improving network efficiency.

The other described devices have different roles: a router connects and routes traffic between different networks; a wireless access point provides wireless connectivity; a device that filters traffic is a firewall or similar security appliance. Some switches offer extra security features, but their primary purpose is to interconnect devices within the same LAN.