多项选择题
A.when they receive a special token
B.when there is a carrier
C.when they detect no other devices are sending
D.when the medium is idle
E.when the server grants access
多项选择题 Which of the following are benefits of VLANs? （）
多项选择题 What are three benefits of implementing vlans?（）
单项选择题 A switch is configured with all ports assigned to vlan 2 with full duplex FastEthernet to segment existing departmental traffic. What is the effect of adding switch ports to a new VLAN on the switch?（）