正确答案:AEFA,E,F 解析:Explanation:VLANs establish broadcast domains in switched networks, so by virtue of having the option to create many efficient broadcast domains, congestion is reduced and network throughput is greatly enhanced. VLANs allow networks to be divided by department or resource needs, rather then by physical location. When people move departments, leave a department, or join a department, administration is easy and convenient with a few keystrokes.Incorrect Answers:B, D. These would be router functions at layer 3. Switches and VLANs operate at layer 2 of the OSI model.C. The use of VLANs may actually increase the latency in some cases, as traffic from one VLAN to the other will need to be routed.