单项选择题

Which of the following protocols would be used to test if one host is reachable by another host， by sending echo requests and waiting for echo replies？（）

A.SNMP
B.ICMP
C.TCP
D.UDP

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单项选择题

A. UID switch
B. Power switch
C. Cooling fan switch
D. Chassis intrusion switch

单项选择题

A. Plug and Play
B. Warm site
C. Hot plug
D. Hot site

单项选择题

A.172.31.254.40
B.10.100.11.1
C.192.168.100.1
D.172.15.16.76