單項(xiàng)選擇題

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

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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