★资源共享
    资源共享可以是软件共享、数据共享，也可以是硬件共享。它使计算机网络中的资源互通有无、分工协作，从而极大地提高硬件资源、软件资源和数据资源的利用率。

    1. a ”nuts-and -bolts”(基础知识) view of the internet

      1. A “network of networks”
      2. A collection of billions of computing devices, and packet switches interconnected by links.
      3. A collection of hardware and software components executing protocols that define the format and the order of messages exchanged between two or more communicating entities, as well as the actions taken on the transmission and/or receipt of a message or other event.
    2. a “services” view of the Internet
      1. A place I go for information, entertainment, and to communicate with people.
      2. A platform for building network applications.