Networking Protocols: SMTP, HTTP, and IMAP Key Concepts

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Last updated 4:34 PM on 9/30/26
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7 Terms

1
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How many RTTs occur before sending email after the initial TCP and SMTP handshakes?

2.5 RTTs: 1 for TCP, 0.5 for the server greeting, and 1 for SMTP HELO and its reply.

2
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Which characteristics apply only to HTTP?

Client pull; blank line ends the request header; server port 80.

3
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Which characteristics apply only to SMTP?

Client push; CRLF.CRLF ends the message; server port 25.

4
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Which characteristics do HTTP and SMTP share?

ASCII commands and responses; status codes; persistent TCP connections.

5
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Which protocol pushes email from a mail client to a mail server?

SMTP.

6
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Which protocol pulls email from one mail server to another?

Neither SMTP nor IMAP. SMTP pushes email between servers.

7
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Which protocol pulls email from a mail server to a mail client?

IMAP.