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A host is expected to be a mail relay or receiving endpoint. Which of the following daemons should be listening for connections on port 25？（）
- A、ftpd
- B、imapd
- C、pop3d
- D、sendmail
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单选题Host A opens a Telnet connection to Host B. Host A then opens another Telnet connection to Host B. These connections are the only communication between Host A and Host B. The security policy configuration permits both connections. How many sessions exist between Host A and Host B?（）A
1B
2C
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