单项选择题
A.All CE devices emulate a bridge B.All provider devices emulate a bridge C.Hierarchical VPLS reduces signaling overhead D.Each PE device emulates a bridge E.Each CE device emulates a bridge
A.TCP B.UDP C.HTTP D.Multicast
A.It allows ITCM to send multiple upstream packets in one single large burst. B.It reduces upstream data throughput. C.It can be enabled/disabled from CMTS on per upstream port basis if desired D.Concatenation activity on an interface can be checked by the show controller counters command