●Ipv6 is (71) for "Internet Protocol Version 6"。Ipv6 is the "next generation" protocol des

Question

●Ipv6 is (71) for "Internet Protocol Version 6"。Ipv6 is the "next generation" protocol design by the IETF to (72) the current version Inernet Protocol,IP Version 4．Most of today's internet uses Ipv4,which is now nearly twenty years old．Ipv4 has been remarkably resilient in spite of its age,but it is beginging to have problems．Most importantly ,there is a growing (73) of Ipv4 addresses,which are needed by all new machines added to the Internet．Ipv6 fixs a number of problems in Ipv4,shch as the (74) number of available Ipv4 addresses．It also adds many improvements to Ipv4 in areas such as souting and network autoconfiguration．Ipv6 is expected to gradually replace Ipv4 ,with the two coexing for a number of years during a transition (75) ．

(71) A．short

B．abbreviate

C．abbreviation

D．initial

(72) A．substitution

B．replace

C．switchover

D．swap

(73) A．scarcity

B．lack

C．deficiency

D．shortage

(74) A．restrict

B．limited

C．imprison

D．confine

(75) A．period

B．days

C．epoch

D．phase

Answer 1

正确答案：B,D,D,B,A
【解析】IPv6是因特网协议版本6的缩写。IPv6是IETF设计来替换当前版本的Internet协议IPv4的下一代协议。现在在因特网上最常用的是IPv4，已经有接近20年的历史了。虽然IPv4应用很久了，其弹性还是很明显的，但现在开始出现问题了。最重要的是，当很多新的机器添加到网络上来时，IPv4地址就显得日益缺乏。IPv6修正了IPv4中的许多问题，例如受限可用的IPv4地址数量。它还加入了一些对IPv4的改进，诸如路由和网络自动配置。IPv6将逐渐替代IPv4，在转换期内它们将共存许多年。