多项选择题
A.it is a layer 2 messaging protocol which maintains vlan configurations across network.
B.it includes an 8-bit field which specifies the priority of a frame.
C.it is used exclusively for tagging vlan frames and dose not address network reconvergence following switched network topology changes.
D.it modifies the 802.3 frame header,and thus requires that the FCS be recomputed.
E.it is a trunking protocol capable of carring untagged frames.
单项选择题 Based on the network shown in the graphic which option contains the potential networking problem and protocol or setting that can to prevent the problem?（）
单项选择题 Which command can be used from a PC to verify the connectivity between hosts that connect through a switch in the same LAN?（）
多项选择题 Which two benefits are provided by creating VLANs? （）