问题
单项选择题
(66) is a protocol that a host uses to inform a router when it joins or leaves an Internet multicast group.
(67) is an error detection code that most data conlmunication networks use.
(68) is an interior gateway protocol that uses a distance vector algorithm to propagaterouting information.
(69) is a transfer mode in which all types of information are organized into fixed form cells on all asynchronous or nonperiodic basis over a range of media.
(70) is an identifier of a web page.
(66)处填()。
A.ICMP
B.SMTP
C.IGMP
D.ARP
答案
参考答案:C