阅读以下短文，回答98-100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 software upgrades or translator facilities are necessary for networking devices that need to communicate on both networks.Most modern computer operating systems already support both versions of the Internet Protocol.Network infrastructures,however,are still lagging in this development.Aside form 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 Internet is defined by its interconnections and routing policies.]

Based on the paragraph above, it is shown that in order to deploy IPv6 protocol on the Internet,（ ）has to be built. The network devices which need to communicate with both networks are required to have upgraded software or （ ）in the movement of IPv4 to IPv6 transition,（ ）are relatively slow in this event.