题目内容

6. In a clustering of 4,294,967,296 nodes, if we still want to keep the three-level hierarchy like the one in Figure 1.1，but like to have the same number of group members, groups, and supergroups at the group, supergroup, and “super-supergroup” levels, respectively, what is that number approximately?6．在一个拥有4,294,967,296个节点的集群中，如果仍然要保持像图1.1中所示的三个层次，但仍希望有相同数量的组成员和组，组上的超群组，超组，以及“超超组”层，那么近似的数量是多少？

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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？

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？