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CDN refers to the static content of a website distributed to multiple servers so that users can access it nearby to improve the speed. Therefore, CDN is also a method of bandwidth expansion, which can be used to defend against DDOS attacks.PS: Many forums have seen beginners ask whether WCF still needs to learn in depth, because they think these technologies may be outdated. Maybe Microsoft will launch a new SOA implementation scheme at that time. Wouldn't it be a waste of time to learn in depth, so they feel that there is no need to learn in depth and just know how to use them. I had the same feeling about this problem before, but now I think that although WCF technology may be replaced, the key to understanding a technology in depth is not to know some more advanced API calls, but to understand its implementation mechanism and way of thinking. Even if the latter technology is replaced, the mechanism behind it is definitely similar. Therefore, if you have a thorough understanding of a technology, you will feel familiar with the new technology and relaxed about it. In addition, after you have a thorough understanding of a technology, you dare to say that you have mastered the technology well during the interview, instead of saying that you use it a lot at ordinary times. Once you ask deeply, you do not know the implementation principle behind it. This is also why I want to write WCF series. I hope this opinion is helpful to some beginners.　　该剧将以雨贤为中心描写网络购物的现况。约翰（艾伦·阿金 Alan Arkin 饰）是一名聋哑人，在小镇上的一间礼品店里工作，听觉和语言的缺失让他拥有更加敏锐的洞察力，也更加容易看透人和事的本质。约翰住在租来的房间里，这个房间原来的主人是一个名叫米克（桑德拉·洛克 Sondra Locke 饰）的女孩。Grandma Lily got up and went to the cabinet, took out three gifts, slowly walked to the front of the fireplace in the living room, and put them into three socks in turn.　　区党委不知去向。至此，桑义After the incident, the police found various search records in her computer, such as "how to make people unconscious", "how to give a caesarean section", "how to take out the baby from the body" and other related records, confirming that she was actually a premeditated crime.