Which tree of these are types of Ethernet Virtue Connections （EVCs） in the MEF concept？（）

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• panning Tree Protocol calculates path cost based on which of these？（）

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• Which two of these are used in the selection of a root bridge in a network utilizing Spanning Tree Protocol IEEE 802.1D？（）

  A . Designated Root Cost B . bridge ID priority C . max age D . bridge ID MAC address E . Designated Root Priority F . forward delay

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  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.

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