200-301: Cisco Certified Network AssociateDemo

A Layer 2 switch can segment traffic by using VLANs, and VLANs are carried across trunk links with tagging protocols such as IEEE 802.1Q. Cisco documentation describes VLAN switching as being accomplished through frame tagging and notes that switches isolate collision domains for attached hosts, which rules out the alternatives about one shared collision domain, flooding all frames to every device, or operating only at half duplex.