For each blank, choose the best answer from the four choices and write down on the answer'sheet.(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 communication networks use.(68)is an interior gateway protocol that uses a distance vector algorithm to propagate routing information.(69)is a transfer mode in which all types of information are organized into fixed form. cells on an asynchronous or non-periodic basis over a range of media.(70)is an identifier of a web page.A．ICMPB．SMTPC．IGMPD．ARP
For each blank, choose the best answer from the four choices and write down on the answer'sheet.
(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 communication networks use.
(68)is an interior gateway protocol that uses a distance vector algorithm to propagate routing information.
(69)is a transfer mode in which all types of information are organized into fixed form. cells on an asynchronous or non-periodic basis over a range of media.
(70)is an identifier of a web page.
A．ICMP
B．SMTP
C．IGMP
D．ARP
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