By default, all ports on a switch belong to one broadcast domain, so a broadcast frame can be sent out the other ports.

### Why this is right The material states that, by default, switch ports belong to the same broadcast domain. When a broadcast frame arrives, the switch sends it out the other ports in that domain, excluding the incoming port. ### The concept A broadcast domain defines the area in which a Layer 2 broadcast is distributed. If two unrelated IP subnets share one broadcast domain, broadcasts such as ARP requests can reach devices that do not need them. VLANs divide switch ports into separate broadcast domains, so broadcasts are contained to the ports in the relevant VLAN. This reduces unnecessary delivery and can improve separation between groups of devices. A switch's default arrangement and its VLAN configuration should not be confused: assigning ports to VLANs changes which ports share a broadcast domain. ### Terms - **Broadcast domain**: The set of devices and ports that receive a particular Layer 2 broadcast. - **Switch**: A device that connects local devices and forwards frames. - **Frame**: A data unit sent over a link such as Ethernet. - **VLAN**: Virtual Local Area Network. A logical grouping that separates switch ports into broadcast domains. - **ARP**: Address Resolution Protocol. A protocol that uses local broadcast requests to find IPv4-to-MAC mappings. - **IP**: Internet Protocol. The addressing system used to identify network destinations. ### Remember Broadcasts stay within their broadcast domain, and VLANs create separate broadcast domains.