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7. If, due to the shortage of IP addresses, we halve the size at the group and the supergroup levels in Figure 1.1, with at most 128 group members for a group and 128 groups for a supergroup, how many supergroups can we allow?7．如果由于IP地址短缺，我们将图1.1中的组和超组一分为二，每组最多有128个成员每个超组最多有128个组，则最多允许多少这样的超组？

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8. Compare the differences in the requirements and principles for data communications and tele(voice)communications. Name the three most important differences and explain.8．比较数据通信和电信（语音）通信的要求和原则之间的差异。对最重要的三个差异进行命名并加以解释。

9. Why is the Internet designed as a routed instead of a switched network? If it were designed as a switched network, what layers and mechanisms would need to be changed?9．为什么互联网被设计成路由式的而不是交换式的网络？如果它被设计成一个交换式的网络，则需要改变哪些层次和机制？

10. Here we compare the overhead of routing packets and switching packets. Why is the time complexity of routing higher than switching, while the space complexity of switching is higher than routing?10．比较一下路由分组和交换分组的开销。为什么路由时间复杂度高于交换，而交换的空间复杂度要比路由的高？

11. If a new routing protocol is to be supported in routers, what should be deifned as standard and what should be left as implementation-dependent design?11．如果要在路由器上支持新的路由协议，需要将那些内容定义为标准、那些内容应该留作实现与相关的设计？