正确答案: A

tc/hosts

题目：在Linux中，文件（）用于解析主机域名。

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学习资料的答案和解析：

[单选题]The de facto standard Application Program Interface (API) for TCP/IP applications is the “sockets” interface. Although this API was developed for （71） in the early 1960s it has also been implemented on a wide variety of no-Unix systems. TCP/IP （72） Written using the sockets API have in the past enjoyed a high degree of portability and we would like the same （73） with IPv6 applications. But changes are required to the sockets API to support IPv6 and this memo describes these changes. These include a new socket address structure to carry IPv6 （74） ,new address conversion functions, and some new socket options. These extensions are designed to provide access to the basic IPv6 features requited by TCP and UDP applications, including multicasting, while introducing a minimums of change into the system and providing complete （75） for existing IPv4 applications.

C．Unix

[单选题]结构化布线系统是一种模块化且灵活性极高的建筑物内的信息传输系统，其结构一般采用（）。

A、星型

[单选题]某交换机有24个端口，每个端口的带宽为100M且均工作在全双工模式下，则该交换机的最小背板带宽为（）。

4800M

[多选题]关于机算机网络，以下说法哪个正确？（）

网络是通信技术和计算机技术相结合的产物。

当今世界规模最大的网络是因特网

[单选题]IP地址172.17.16.255/23是一个（）。

主机地址

[多选题]顾客异议可能意味着（）

购买兴趣

购买阻力

需要更多信息

[多选题]TCP/IP参考模型中没有（）。

会话层

表示层