CNN（Cable News Network）

SNS（Social Network Software，社会网络）

英译中：Local Area Network

英文“local area network”的含义是“（）”。

A:广域网 B:虚拟专网 C:信号网 D:局域网

According to the passage the cable network Home Box Office ______.

A:is a French company B:had telecast the concert without further promoting C:is favored not only by children but by parents D:telecast the concert in prime time on a weekend

Supply chain is defined as the network including（）．

A:retailers&wholesalers B:manufacturers C:service providers D:suppliers

A multicast router may receive thousands of multicast (6) every day for different groups. If a router has no knowledge about the membership status of the (7) , it must broadcast all of these packets. This creates a lot of traffic and consumes (8) . A better solution is to keep a list of groups in the network for which there is at least one loyal member. (9) helps the multicast router create and update this list. For each group, there is one router that has the duty of distributing the (10) packets destined for that group. This means that if there are three multicast routers connected to a network, their lists of groupids are mutually exclusive. A host or multicast router can have membership in a group.

A:routers B:network C:packets D:hosts

TCP/IP (1) layer protocols provide services to the application(2) running on a computer. The application layer does not define the application itself, but rather it defines  (3) that applications need-like the ability to transfer a file in the case of HTTP. In short, the application layer provides an (4) between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP  (5) layer consists of two main protocol options-the Transmission Control Protocol (TCP) And the User Datagram Protocol (UDP).

A:application B:transport C:link D:network

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