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  59
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．
(73)
选项 A、portability
B、availability
C、capability
D、reliability
答案A
解析
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