计算机网络自顶向下方法
One’sunderstandingofnetworkprotocolscanoftenbegreatlydeepenedby“seeingprotocolsinaction”andby“playingaroundwithprotocols”–observingthesequenceofmessagesexchangedbetweentwoprotocolentities,delvingdownintothedetailsofprotocoloperation,andcausingprotocolstoperformcertainactionsandthenobs
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