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单项选择题

以下关于无线局域网标准的描述中，错误的是______。

A．802.11协议的MAC层分为DCF子层与PCF子层
B．802.11规定的数据传输速率为1Mbps或2Mbps
C．802.11b规定的数据传输速率为1Mbps、2Mbps、5.5Mbps或11Mbps
D．802.11a规定的数据转输速率为100Mbps
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热门试题

单项选择题下列是一台Cisco路由器的部分路由表，表中的路由信息完全正确的是______。

A．Gateway of last resort is 202.112.41.217 to network 0.0.0.0C 212.112.7.0/24 is directly connected,VLAN120212.112.37.0/30 is subnetted,1subnetsC 212.112.37.16 is directly connected,VLAN130167.105.0.0/26 is subnetted,2subnetsS 167.105.125.128 [1/0] via 202.112.7.1S 167.105.144.192 [1/0] via 202.112.7.1S * 0.0.0.0/0 [1/0] via 202.112.41.217
B．Gateway of last resort is 202.112.41.217 to network 0.0.0.0C 212.112.7.0/24 is directly connected,FastEthernet 2/5212.112.37.0/30 is subnetted,1 subnetsC 212.112.37.16 is directly connected,POS3/0167.105.0.0/26 is subnetted,2subnetsS 167.105.125.128 [1/0] via2 02.112.7.1S 167.105.144.192 [1/0] via 202.112.7.1S * 0.0.0.0/0 [1/0] via 202.112.7.1
C．Gateway of last resort is 202.112.41.217 to network 0.0.0.0C 212.112.7.0/24 is directly connected,FastEthernet 2/5212.112.37.0/30 is subnetted,1 subnetsC 212.112.37.16 is directly connected,POS3/0167.105.0.0/26 is subnetted,2 subnetsS 167.105.125.128 [1/0] via 202.112.7.1S 167.105.144.192 [1/0] via 202.112.7.1S * 0.0.0.0/0 [1/0] via 202.112.41.217
D．Gateway of last resort is 202.112.41.217 to net work 0.0.0.0C 212.112.7.0/24 is directly connected,FastEthernet2/5212.112.37.0/30 is subnetted,1 subnetsC 212.112.37.16 is directly connected,POS3/0167.105.0.0/26 is subnetted,2 subnetsS 167.105.125.128 [20/0] via 202.112.7.1S 167.105.144.192 [20/0] via 202.112.7.1S * 0.0.0.0/0 [20/0] via 202.112.41.217

单项选择题速率为10Gbps的Ethernet发送1bit数据需要的时间是_______。

A.1×10-6秒
B.1×10-9秒
C.1×10-10秒
D.1×10-12秒