Which three statements about SMTP are true? (Choose three.)
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A. B. C. D. E. F.AEF.
SMTP stands for Simple Mail Transfer Protocol. It is a standard protocol used for sending and receiving emails over the internet. Here are the correct statements about SMTP:
A. SMTP uses TCP port 25: This statement is true. SMTP uses TCP port 25 for communication between the email client and email server. This port is reserved exclusively for SMTP communication.
B. The POP protocol is used by the SMTP client to manage stored mail: This statement is false. POP (Post Office Protocol) is a protocol used by email clients to retrieve email messages from a remote server. It is not used for managing stored mail on an SMTP server.
C. The IMAP protocol is used by the SMTP client to send email: This statement is false. IMAP (Internet Message Access Protocol) is a protocol used by email clients to access and manage email messages stored on a remote server. SMTP is used to send email messages from the email client to the SMTP server.
D. The mail delivery agent in the SMTP architecture is responsible for DNS lookup: This statement is false. The mail delivery agent in the SMTP architecture is responsible for delivering email messages to the recipient's mailbox. DNS (Domain Name System) lookup is performed by the SMTP client to locate the correct mail server.
E. SMTPS uses SSL and TLS: This statement is true. SMTPS (SMTP Secure) is a secure version of SMTP that uses SSL (Secure Sockets Layer) or TLS (Transport Layer Security) to encrypt email messages in transit between the email client and the SMTP server.
F. SMTP uses TCP port 587: This statement is also true. TCP port 587 is an alternative port used by email clients to send email messages to an SMTP server. This port is used when SMTP traffic on port 25 is blocked by a firewall or other network security device.
In summary, the three true statements about SMTP are: SMTP uses TCP port 25, SMTPS uses SSL and TLS, and SMTP uses TCP port 587 as an alternative port for sending email.