Which term describes isolating a broadcast domain within a single switch using VLANs?

Which term describes isolating a broadcast domain within a single switch using VLANs?

• A. security zones
• B. port security
• C. VLAN
• D. attack surface

Answer: (C)

Isolating a broadcast domain within a switch is achieved with VLANs, which create separate logical networks on the same physical device. A broadcast domain is the set of devices that all receive the same broadcast frames. By assigning switch ports to different VLANs, devices in one VLAN only see broadcasts from their own VLAN; broadcasts don’t cross into other VLANs, so each VLAN forms its own isolated broadcast domain. Inter-VLAN communication requires routing, so a router or Layer 3 switch must be used to allow hosts in different VLANs to talk to each other. When VLANs span multiple switches, trunk links carrying multiple VLANs (with 802.1Q tagging) keep the broadcast domains separate across the network. Other terms like security zones, port security, or attack surface describe different security concepts and do not specifically describe isolating broadcast domains within a switch.

Isolating a broadcast domain within a switch is achieved with VLANs, which create separate logical networks on the same physical device. A broadcast domain is the set of devices that all receive the same broadcast frames. By assigning switch ports to different VLANs, devices in one VLAN only see broadcasts from their own VLAN; broadcasts don’t cross into other VLANs, so each VLAN forms its own isolated broadcast domain. Inter-VLAN communication requires routing, so a router or Layer 3 switch must be used to allow hosts in different VLANs to talk to each other. When VLANs span multiple switches, trunk links carrying multiple VLANs (with 802.1Q tagging) keep the broadcast domains separate across the network. Other terms like security zones, port security, or attack surface describe different security concepts and do not specifically describe isolating broadcast domains within a switch.