从业人员在职业活动中应努力做到( )。

A．(B) 平等待

For each blank，choose the best answer from the four choices and write down on the answer sheet．

(1) is a protocol that a host uses to inform a router when it joins or leaves an Internet multicast group．

(2) is an error detection code that most data communication networks use．

(3) is an interior gateway protocol that uses a distance vector algorithm to propagate routing information．

(4) 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.

(5) is an identifier of a web page.

5（）

A．HTTP

B．URL

C．HTML

D．TAG