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Computer Networks Lecture 6: Electronic Mail and Domain Name System

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Computer Networks Lecture 6: Electronic Mail and Domain Name System

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Questions and Answers

What is the main responsibility of the Simple Mail Transfer Protocol (SMTP) in the context of electronic mail?

Composing and editing mail messages

Managing the mailbox of the user

Reading incoming mail messages

Reliably transferring email messages between mail servers (correct)

Which port does SMTP typically use for the transfer of email messages?

Port 443

Port 80

Port 25 (correct)

Port 110

What is the main role of a user agent in the context of electronic mail?

Reliably transferring email messages between mail servers

Managing the mailbox of the user

Storing outgoing (to be sent) mail messages

Composing, editing, and reading mail messages (correct)

Which component contains all the messages of a user in the electronic mail process?

Mailbox (C) Signup and view all the answers

In the context of electronic mail, what is the primary function of a mail server?

Managing the mailbox of the user (C) Signup and view all the answers

What type of transfer occurs when sending and receiving emails on the same mail server?

Direct transfer (D) Signup and view all the answers

What is the primary purpose of the SMTP protocol?

Exchanging email messages between mail servers (A) Signup and view all the answers

In the context of SMTP messages, what is represented by commands written in 7-bit ASCII format?

Status code (D) Signup and view all the answers

Which protocol is primarily used for retrieving emails from the server?

Post Office Protocol (POP) (D) Signup and view all the answers

What happens during step 3 of the SMTP message exchange process?

TCP connection is established with Bob's mail server (C) Signup and view all the answers

Which type of protocol is HTTP primarily considered to be?

Pull protocol (C) Signup and view all the answers

What is the role of user agent in the context of SMTP?

Composing and sending emails to the mail server (B) Signup and view all the answers

Which protocol allows the user to organize messages in folders and keeps user state across sessions?

IMAP (B) Signup and view all the answers

What differentiates SMTP from HTTP in terms of port usage?

SMTP uses port 25, while HTTP uses port 80 (B) Signup and view all the answers

What differentiates POP from IMAP in terms of message storage?

POP keeps all messages in one place at the server, while IMAP allows users to organize messages in folders (C) Signup and view all the answers

What represents the end of an SMTP message in terms of formatting?

Carriage Return/Line Feed (CRLF) (C) Signup and view all the answers