一名学生A希望访问网站www.google.com。学生A在其浏览器中输入http://www.google.com并按回车，直到Google的网站首页显示在其浏览器中，请问：在此过程中，按照TCP/IP参考模型，从传输层（包括传输层）到网络接口层（包括网络接口层）都用到了哪些协议，每个协议所起的作用是什么？

A. a rather official style
B. a rather conversational style
C. a rather bureaucratic style
D. a rather indirect style

A. use “you” and “we”
B. use modern language
C. use complicated words and long sentences
D. use active not passive voice

A. It gives a brief indication of the content of the letter.
B. It is usually placed directly after the salutation.
C. It is usually presented in upper case letters
D. It can also presented in initial capitals with underscore.