单项选择题

Prior to 802.1w，Cisco implemented a number of proprietary enhancements to 802.1D to improve convergence in a Layer 2 network. Which statement is correct？（）

A.Only UplinkFast and BackboneFast are specified in 802.1w；PortFast must be manually configured.
B.Only PortFast is specified in 802.1w；UplinkFast and BackboneFast must be manually configured.
C.None of the proprietary Cisco enhancements are specified in 802.1w.
D.PortFast，UplinkFast，and BackboneFast are specified in 802.1w.

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单项选择题OnthebasisofthedefinitionsofdifferentservicesinvariousRFCs，trafficwithExpeditedForwardingper-hopbehaviorshouldbemarkedaswhichofthese？（）

A.IP ToS of 0xEF
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A.DHCP requests will be switched in the software， which may result in lengthy response times.
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A.Is best suited for applications that are in the one-to-many category.
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多项选择题ForthefollowingLMItypes，whichthreecanbeconfiguredforusewithFrameRelayonaCiscorouter？（）

A.Cisco
B.ANSI - Annex D
C.Q.931 - Annex B
D.Q.933 - Annex A