The following detail sections describe a sample routing application as it evolves over a sequence of milestones. We strongly recommend taking the time to read and understand this story.
下面的详情区描述了一个带路由的范例应用，它经过一系列里程碑一步步演进。我们强烈建议你花点时间阅读并理解这个过程。
The default sequence might very well be arbitrary: the first item might be about routing protocol while the second one might be about LAN switching, etc.
默认的考题顺序通常是随机的：第一项考题可能是关于路由协议的而第二项考题有可能就是LAN交换的等。
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