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．(66)

A．SMTP

B．ICMP

C．RARP

D．IGMP(67)

A．4B／SB

B．CRC

C．Manchester Code

D．Huffman Code(68)

A．OSPF

B．RIP

C．RARP

D．BGP(69)

A．ADSL

B．ATM

C．Frame. Relay

D．DDN(70)

A．HTTP

B．URL

C．HTML

D．TAG

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