题目内容：
根据下列题干，回答题：（ 66 ）is a protocol that a host uses to inform a router when it joins or leaves anInternet 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.
请选择（ 66 ）处最佳答案
参考答案：
答案解析：