正确答案: C

C．Unix

题目：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.

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学习资料的答案和解析：

[单选题]在Linux操作系统中把外部设备当作文件统一管理，外部设备文件通常放在（）目录中。

A．/dev

[多选题]从宏观上讲，防火墙的主要功能有（）

创建一个阻塞点

隔离不同网络，防止内部信息的外泄

强化安全策略

有效审计和记录内、外网络上的漏洞

[单选题]查询city列的值为空的记录，在where子句中的条件应写为（）。

city is null