Which statement is true about the MAC entries in a switch's bridge table?

The correct statement about the MAC entries in a switch's bridge table is that the switch dynamically adds MAC entries based on the source MAC address of received frames. This is a fundamental function of how switches operate within a local area network (LAN). When a switch receives a frame, it examines the source MAC address of that frame and then records this address in its bridge table (also known as a MAC address table). This process allows the switch to learn which devices are connected to which ports, enabling it to efficiently forward frames only to the intended recipient rather than broadcasting to all ports.

As a result, when the switch receives further frames destined for that learned MAC address, it can send them directly to the appropriate port. This learning process enhances network efficiency by reducing unnecessary traffic and ensuring faster communication.

The incorrect options reflect misunderstandings of how switches handle various types of frames. The switch does not solely learn from unicast frames or exclude multicast traffic entirely. Understanding the behavior of the bridge table and how it builds entries based on the source MAC address is crucial for effective network management and troubleshooting.