32 Questions
What is the main responsibility of Simple Mail Transfer Protocol (SMTP)?
Reliably transferring email messages between mail servers
Which component of the electronic email process is responsible for composing, editing, and reading mail messages?
User agents
On which port does SMTP use TCP to transfer email messages?
Port 25
Which protocol is used for sending and receiving emails on the same mail server?
SMTP
What is the main function of user agents in the electronic email process?
Composing, editing, and reading mail messages
Which component of the electronic email process contains all the messages of the user?
Mail servers
In the process of sending an email, what is the first step that Alice takes?
Alice uses user agent (UA) to compose the message
What is the role of the client side of SMTP in the email sending process?
Opening a TCP connection with Bob’s mail server
Which protocol is primarily used for retrieving emails from the server?
Internet Mail Access Protocol (IMAP)
What is the purpose of the SMTP protocol?
Sending and storing emails on the receiver’s mail server
What type of connection does SMTP use?
Persistent connection
Which step in the SMTP messages involves transferring the email over a TCP connection?
Transfer of emails
What represents a command in an SMTP message?
"DATA 354 Enter mail, end with "." on a line by itself"
Which feature is supported by IMAP for organizing messages?
Keeps all messages in one place (at server)
"Comparison Between SMTP and HTTP": Which protocol is mainly used for webpages?
HTTP
In email access protocols, which one supports session management and cookies to maintain state?
HTTP
SMTP is an application layer protocol responsible for the connection between ______ servers
SMTP uses TCP to reliably transfer email message on port ______
25
User agent is responsible for ______ composing, editing, reading mail messages
just
Mailbox contains all messages of ______
user
SMTP protocol works between mail servers to send email ______
messages
Direct transfer: sending and receiving emails on the same mail ______
server
Alice sends message to ______
Bob
SMTP client sends Alice’s message over the ______ connection
TCP
Alice’s UA sends message to her ______ server; message placed in message queue
Client side of SMTP opens TCP connection with ______’s mail server
Bob
______’s mail server places the message in Bob’s mailbox
Bob’s
Bob invokes his user agent to read ______
message
SMTP Messages Mail servers communicate using these steps: ______ transfer of emails closure
handshaking
SMTP message is written (header & body) in 7-bit ______
ASCII
SMTP is used for mail ______
servers
Study Notes
Email Process
- The Simple Mail Transfer Protocol (SMTP) is responsible for sending and receiving email messages between mail servers.
- The user agent is responsible for composing, editing, and reading mail messages.
SMTP Protocol
- SMTP uses TCP to transfer email messages on port 25.
- SMTP is an application layer protocol responsible for the connection between mail servers.
- SMTP protocol works between mail servers to send email messages.
- Direct transfer involves sending and receiving emails on the same mail server using SMTP.
Email Sending Process
- The first step in sending an email involves the user agent composing the message.
- The client side of SMTP opens a TCP connection with the recipient's mail server.
- The SMTP client sends the message over the TCP connection to the recipient's mail server.
- The recipient's mail server places the message in the recipient's mailbox.
Email Retrieval
- The primary protocol used for retrieving emails from the server is not SMTP, but rather IMAP or POP3.
SMTP Messages
- SMTP messages involve the transfer of emails over a TCP connection.
- SMTP messages are written in 7-bit ASCII (header and body).
- SMTP is used for mail transfer.
User Agent and Mailbox
- The user agent is responsible for composing, editing, and reading mail messages.
- The mailbox contains all messages of the user.
Comparison with HTTP
- HTTP is mainly used for webpages, whereas SMTP is used for email transfer.
- IMAP supports session management and cookies to maintain state, unlike SMTP.
Test your knowledge on electronic mail (SMTP, comparison with HTTP, email access protocols) and Domain Name System (DNS) in the context of computer networks. This quiz covers agenda items from lecture 6 of Dr. Dina Fawzy's class, with reference to the book 'Computer Networking: A Top Down Approach' by Jim Kurose and Keith Ross.
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