The de facto standard application program interface (API) for TCP/IP applications is the "sockets" interface. Although this API was developed for Unix in the early 1980s it has also been implemented on a wide variety of non-Unix systems. TCP/IP applications written using the sockets API have in the past enjoyed a high degree of portability and we would like the same portability 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 addresses, new address conversion functions, and some new socket options. These extensions are designed to provide Access to the basic IPv6 features required by TCP and UDP applications, including multicasting, while introducing a minimum of change into the system and providing complete compatibility for existing IPv4 applications.

关于软考成绩查询

软考成绩中级和高级的发布时间是不同的，中级的成绩根据各省的效率，一般是1个月左右，而高级由于是阅卷，统一出成绩，而且涉及科目多一些，所以时间比中级要晚半个月到一个月，所以高级的成绩要等考试后1个半月以上。届时希赛网软考网将会及时更新，软考成绩查询入口

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2013年下半年网络工程师上午题答案（完整网友版）

2013年下半年网络工程师下午题答案（完整网友版）