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5. Suppose there are 3,000,000 new phone call arrivals per minute to the switched telephone system worldwide, with each call lasting for 5 minutes on average, and there are 6 hops (i.e. 6 links and 6 nodes) on average between the callers and callees. How many memory entries are occupied on average to support the switched connectivity worldwide?5．假设每分钟有300万个新的电话呼叫到达全球范围的电话交换系统，平均每次通话长达5分钟，并且每个呼叫用户和被叫用户之间平均有6跳（即6条链路和6个节点）。那么为了支持全球交换连接平均需要占用多少内存表项？

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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？

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？