写在前面的话昨晚接到阿里巴巴的电话，是CDN运维工程师岗位的面试内容。从这个角度上来说，我得承认阿里巴巴在互联网上的专业性，很多集团都没有为CDN单独开设一个运维工程师的岗位，而阿里巴巴却这么做，可见阿里巴巴在互联网上的细节和挖掘程度的确是全国前列的水平。既然是CDN运维，何为CDN？CDN就是...

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