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Cpr E 230 > mail > Flashcards

mail Flashcards

not fail exam 2

1
Q

What protocol does mail use to send messages?

A

SMTP

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2
Q

What is a MTA?

A

Message transfer agent

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3
Q

How do emails get to their destination?

A

Routing through multiple MTAs

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4
Q

What is a UA?

A

Application that allows users to do stuff with emails

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5
Q

What are the two types of UAs?

A

Local and remote

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6
Q

What is a remote UA?

A

UA is an application on a device (laptop) that uses SMTP to send messages, and IMAP or POP3 to read messages.

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7
Q

When is authentication done for remote UAs?

A

Before mail is retrieved.

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8
Q

What is a local UA?

A

When the UA is the same computer as the MTA.

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9
Q

When is authentication done with local UAs?

A

With login

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10
Q

What is MIME?

A

Multipurpose Internet Mail Extensions

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11
Q

What is MIME used for?

A

UAs use it to display messages. Can display images, audio, even encrypt stuff! Basically makes emails more fun :) and wayyyyyy more sketch…

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12
Q

What do MTAs add to message headers?

A

Date/time
Email address
IP address

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13
Q

What is SMTP used for?

A

Usually clients sending commands across a server

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14
Q

What does the SMTP command HELO do?

A

Introduces yourself

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15
Q

What does the SMTP command EHLO do?

A

Requests extended mode and does what HELO does

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16
Q

What does the SMTP command MAIL FROM do?

A

Specifies the sender

17
Q

What does the SMTP command RCPT TO do?

A

Specifies the recipient

18
Q

What does the SMTP command DATA do?

A

Specifies the body of the message

19
Q

What does the SMTP command RSET do?

A

resets

20
Q

What does the SMTP command QUIT do?

A

Quits

21
Q

What does the SMTP command HELP do?

A

Gets help about the session

22
Q

What does the SMTP command VRFY do?

A

Verifies an address for you

23
Q

What does the SMTP command EXPN do?

A

Expands an address

24
Q

What does the SMTP command VERB do?

A

Verbose mode (more output probably)

25
Q

What is POP3 used for?

A

Downloading email messages. Not great for multiple locations accessing it at the same time though.

26
Q

What is IMAP used for?

A

Access messages (without removing them from the server usually). Usually fine with multiple locations.

27
Q

What is a Sender Policy Framework (SPF)

A

Specifies who can send mail from the domain.

28
Q

What is Domain Keys Identified Mail (DKIM)?

A

A way to detect mail spoofing.

29
Q

Which ports are plaintext?

23, 25, 110, 993, 143, 587, 995

A

23, 25, 110, 143

30
Q

What does STARTTLS do?

A

Tries to make insecure connections more secure. Doesn’t encrypt it end-to-end though…

Cpr E 230 (10 decks)

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