多项选择题
A.HTTP B.TFTP C.FTP D.SMTP E.SNMP
A.IEEE802.5 B.IEEE802.2 C.IEEE802.3 D.IEEE802.1
A.DSAP B.SSAP C.协议号 D.端口号
A.Organization Standard Institute B.Organization Standard Interconnection C.Open System Internet D.Open System Interconnection
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