单项选择题

【问题1】（2分）Linux系统中，IP地址的配置文件一般存放在（1）目录下。

A．/etc
B．/var
C．/dev
D．/home

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单项选择题

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.

A．Windows
B．Linux
C．Unix
D．DOS

单项选择题

PC机不能接入因特网，这时采用抓包工具捕获的以太网接口发出的信息如下图：可以看出该PC机的IP地址为（）

A．213.127.115.31
B．213.127.115.255
C．213.127.115.254
D．224.1.1.1

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