Cyber Fundamentals Block 3 Practice Test 2026 - Free Practice Questions and Study Guide

Switches operate by moving frames between devices, which happens at the Data-Link layer. This layer handles how data is framed for transmission on a local link and uses MAC addresses to identify devices on the same network. A switch learns and uses a MAC address table to decide which port to forward a frame to; if the destination is unknown, it broadcasts the frame to all ports in the same collision domain. The Network layer is where packets and routing occur (IP addresses), while the Transport layer deals with end-to-end delivery (ports and connections), and the Physical layer is about the actual signaling on the medium. So, moving frames based on MAC addresses is the hallmark of the Data-Link layer.