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2. Routing vs. switching: stateful or stateless, connection-oriented or connectionless, matching or in-dexing? (Associate these features with routing and switching.)路由与交换机对比：哪个是有状态或无状态的，哪个是面向连接或无连接的，哪个是匹配或索引式的？（将这些功能与路由和交换联系起来。）
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3. What may increase or decrease the latency inside the Internet? (What are the factors that might increase or decrease the latency of queuing, transmission, processing, and propagation, respectively?)3．哪些因素可能增加或减少互联网中的延迟？（有哪些因素可能分别会增加或减少排队，传输，处理和传播延迟？）
4. What do Little’s result and bandwidth-delay product tell us? (Hints: The ormer is about a node, while thelatter is about a link or path.)4．我们从Little结论和带宽延迟积可以得知什么？（提示：前者是一个节点，而后者是一个链路或路径）
5. What does the end-to-end argument say about networking?5．端到端观点是如何解释网络互连的？
According to the end-to-end argument, at which single layer should we put error control or the Internet?But then why do we put it in many layers including link, IP, and transport layers?6．根据端到端的观点，我们应该把错误控制放在互联网上的哪一层?但是我们为什么还要把它放到许多层，包括链路层，IP层和传输层呢？
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