Knowledge Checks

E-mail delays.

How many RTTs are there from when a client first contacts an email server (by initiating a TCP session) to when the client can begin sending the email message itself – that is following all initial TCP or SMTP handshaking required?

Recall the figure below from our class notes:

2.5

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1/5

Comparing and contrasting HTTP and SMTP.

Which of the following characteristics apply to HTTP only (and do not apply to SMTP)? Note: check one or more of the characteristics below.

Operates mostly as a “client pull” protocol.

Uses CRLF.CRLF to indicate end of message.

Uses a blank line (CRLF) to indicate end of request header.

Has ASCII command/response interaction, status codes.

Uses server port 25.

Operates mostly as a “client push” protocol.

Is able to use a persistent TCP connection to transfer multiple objects.

Uses server port 80.

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2/5

Comparing and contrasting HTTP and SMTP (2).

Which of the following characteristics apply to SMTP only (and do not apply to HTTP)? Note: check one or more of the characteristics below.

Uses server port 80.

Has ASCII command/response interaction, status codes.

Uses server port 25.

Operates mostly as a “client pull” protocol.

Is able to use a persistent TCP connection to transfer multiple objects.

Operates mostly as a “client push” protocol.

Uses a blank line (CRLF) to indicate end of request header.

Uses CRLF.CRLF to indicate end of message.

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3/5

Comparing and contrasting HTTP and SMTP (3).

Which of the following characteristics apply to both HTTP and SMTP? Note: check one or more of the characteristics below.

Is able to use a persistent TCP connection to transfer multiple objects.

Operates mostly as a “client pull” protocol.

Uses CRLF.CRLF to indicate end of message.

Uses a blank line (CRLF) to indicate end of request header.

Operates mostly as a “client push” protocol.

Has ASCII command/response interaction, status codes.

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4/5

Which e-mail protocol?

Match the functionality of a protocol with the name of a the email protocol (if any) that implements that functionality.

Question List:

Pushes email from a mail client to a mail server.

Pulls mail from one mail server to another mail server.

Pulls email to a mail client from a mail server.

Answer List:

IMAP
Neither SMTP nor IMAP does this.
SMTP

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5/5

Knowledge checks

E-mail delays.

Comparing and contrasting HTTP and SMTP.

Comparing and contrasting HTTP and SMTP (2).

Comparing and contrasting HTTP and SMTP (3).

Which e-mail protocol?

Question List:

Answer List: