2. 计算机
  3. The de facto standard Application Program Interface(API)for TCP／IP applications is the t•sockets”interface．Although this APl wa

The de facto standard Application Program Interface(API)for TCP／IP applications is the t•sockets”interface．Although this APl wa

admin2014-05-07  55
问题   The de facto standard Application Program Interface(API)for TCP／IP applications is the  t•sockets”interface．Although this APl was developed for  (71)  in the early 1980s it has  also been implemented on a wide variety of non—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  carryIPIv6  (74)。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  (75) for existing IPv4 applications．
(75)
选项 A、avaiolability
B、compatibility
C、capability
D、reliability
答案B
解析 对于TCP／IP应用，事实上的应用程序接口(API)标准是“套接字”口。虽然这个API是在1980年代早期为Unix开发的，但是也广泛的在各种非Unix系统中得到了实现。以前采用套接字API编写的TCP／1P应用具有高度的兼容性，因而我们也希望对IPv6应用也具有同样的兼容性。为了支持IPv6，需要对套接字API作出某些改变，这个便笺就是描述这些变化的。这些改变包括一种新的用于支持：IPv6地址的套接字地址结构、新的地址转换功能以及新的套接字选项。这些扩展可以满足TCP和UDP应用访问IPv6基本功能(包括组播)时的需要，但是只对系统进行了最小的改变，而且与现有的IPv4应用是完全兼容的。
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