单项选择题
A.aggregation congestion occurring at the core layer where the different distribution layer devices feed traffic to the core-layer switches
B.speed mismatches when moving from a low-speed LAN environment to a higher speed WAN environment
C.flapping Ethernet interfaces caused by misconfigured LAN interfaces
D.flapping serial interfaces caused by misconfigured WAN interfaces
E.speed mismatches when moving from a high-speed LAN environment to a lower speed WAN environment
多项选择题 WhichthreeconfigurationtasksarerequiredtosuccessfullydeployNBARtorecognizeTCPandUDPstatefulprotocols？（）
单项选择题 Refer to the exhibit. The serial link that connects the two offices has a bandwidth of 128 kbps.What could be done to set aside 64 kbps of bandwidth to transport VoIP traffic over the WAN link？（）
多项选择题 WhichthreestatementsaretrueabouttheapplianceofQoSmodels？（）