2013年下半年軟考《網(wǎng)絡(luò)工程師》上午英語(yǔ)題原文

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　　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.

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