DNS uses TCP as tranport layer protocol
(2)判断题Domain names are case sensitive
(3)判断题Every domain, either single host or a top level domain, should have a set of resource records
(4)判断题FTP is an application layer protocol and it uses TCP as transport service.
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未经允许不得转载!Chapter 7 Application Layer--Introduction to Appli【含答案】 计算机网