【IPv6 is not interoperable with IPv4．In essence，it establishes a parallel version of the Internet not directly accessible with I

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问题【IPv6 is not interoperable with IPv4．In essence，it establishes a parallel version of the Internet not directly accessible with IPv4 software．This means soft-ware upgrades or translator facilities are necessary for networking devices that need to communicate on both networks．Most modem computer operating systems already support both versions of the Interact Protocol．
Network infrastructures，however,are still lagging in this development．Aside from the complex array of physical connections that make up its infrastructure，the Internet iS facilitated by bi．or multi-lateral commercial contracts(e．g．peering agreements)，and by technical specifications or protocols that describe how to exchange data over the network．Indeed，the Interact iS defined bv its interconnections and routing policies．】
Based on the paragraph above，it is shown that in order to deploy IPv6 protocol on the Interact，(94) has to bc built．The network devices which need to communicate with both networks are required to have upgraded software or(95)．In the movement of IPv4 to IPv6 transition，(96)are relatively slow in this event．
(95)

选项 A、IPv6 software
B、translator facilities
C、operating systems
D、IPv4 software

答案B

解析

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【IPv6 is not interoperable with IPv4．In essence，it establishes a parallel version of the Internet not directly accessible with I

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