题目内容
（请给出正确答案）
（69）
A.213.127.115.31
B.213.127.115.255
C.213.127.115.254
D.224.1.1.1
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The defacto standard Application Program Interface （API） for TCP/IP applications is the “sockets” interface. Although this API 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 carry IPv6 __（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。
A.Windows
B.Linux
C.Unix
D.DOS
WLANs are increasingly popular because they enable cost-effective connections among people and applications that were not possible in the past. For example, WLAN-based applications can enable fine-grained management of supply （71） to improve their efficiency and reduce （72）. WLANs can also enable entirely new business processes. To cite but one example, hospitals are using WLAN-enabled point-of-care （73） to reduce errors and improve overall patient care. WLAN management solutions provide a variety of other benefits that can be substantial but difficult to measure. For example, they can protect corporate data by preventing （74） through rogue access points. They can improve overall network management by integrating with customers’existing systems. Fortunately, it isn’t necessary to measure these benefits to justify investing in WLAN management solutions, which can quickly pay for themselves simply by minimizing time- （75） deployment and administrative chores.
A.custom
B.server
C.chains
D.chances
A. IPv6可以允许全局IP地址重复使用
B．IPv6解决了全局IP地址不足的问题
C．IPv6的出现使得卫星联网得以实现
D. IPv6的设计目标之一是支持光纤通信
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