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An inbound access list has been configured on a serial interface to deny packet entry for TCP and UDP ports 21, 23 and 25. What types of packets will be permitted by this ACL (Choose three.)()。
题目
A.FTP
B.Telnet
C.SMTP
D.DNS
E.HTTP
F.POP3
参考答案
参考答案：D, E, F
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