单项选择题

Which of the following WAN protocols is a circuit switching technology?（）

A. ISDN
B. SONET
C. Frame Relay
D. ATM

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单项选择题

Which of the following wireless standards has a MAXIMUM throughput, by default, of 11Mbps?（）

A.802.11g
B.802.11a
C.802.1n
D.802.11b

单项选择题

Which of the following protocols is commonly used by ping?（）

A.SIP
B.ICMP
C.TFTP
D.ARP

单项选择题

The "1000" in 1000BaseT cabling represents which of the following?（）

A. The theoretical maximum cable length
B. The theoretical maximum bandwidth
C. The theoretical port limit of the cable
D. The quality level of the copper wiring used