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.)（）。
- A、FTP
- B、Telnet
- C、SMTP
- D、DNS
- E、HTTP
- F、POP3
正确答案:D,E,F
答案解析:有
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