Internet mail

Question 1

What is store and forward?

Answer 1

Technique used by email where the information is sent to an intermediate station where it is held to be delivered at later time

Question 2

What two parts does an email consist of?

Answer 2

A user identifier and a domain

Question 3

How does email work?

Answer 3

An email will normally pass through a minimum of 4 systems:

• Senders PC
• Senders outgoing mail server
• Receivers incoming mail server
• Receivers PC

Question 4

What is an email client known as?

Answer 4

Mail user agent (MUA)

Question 5

What is an email server known as?

Answer 5

Mail transfer agent (MTA)

Question 6

When an email is sent what protocol does it use?

Answer 6

SMTP - Simple mail transfer protocol

Question 7

When is SMTP used?

Answer 7

• Mail that passes from the senders PC to the senders outgoing mail server
• Mail that passes between mail servers

Question 8

What is POP?

Answer 8

POP- Post office protocol

Question 9

What is POP used for?

Answer 9

Used to transfer the incoming mail from the incoming mail server to the recipient PC

Question 10

What is IMAP?

Answer 10

IMAP- internet message across protocol

Question 11

What is IMAP used for?

Answer 11

• Instead of using POP to receive email from the server, IMAP may be used.
• IMAP allows the recipient to manage their email directly on the mail server without copying it to their PC

Question 12

What are emails generally encoded with?

Answer 12

MIME or base64

Question 13

What is ESMTP?

Answer 13

Extended Simple Mail transfer

Question 14

What port does SMTP use by default?

Answer 14

Port 25

Question 15

What does the SMTP envelope consist of?

Answer 15

An originator address, a delivery mode and one or mode recipient addresses

Question 16

What two parts does the SMTP content have?

Answer 16

The headers and the body

Question 17

Instead of HELO what does the ESMPT begin the email transaction with?

Answer 17

EHLO

Question 18

What will the server respond to a EHLO?

Answer 18

A list of extensions is supprts

Question 19

What is SMTP authentication (SMTP -AUTH)?

Answer 19

• Access control to allow verification of the sender

- The client logs into the server before sending the mail

Question 20

What is TURN?

Answer 20

Used in cases where connection to a mail server is intermittent.

Question 21

What is ETRN?

Answer 21

A more secure version of TURN where connection client is required to provide a domain name

Question 22

What is ATRN

Answer 22

Same as ETRN but used with dynamic IP address

Question 23

What is MIME?

Answer 23

MIME - Multipurpose internet mail extensions

Question 24

What does MIME do?

Answer 24

It extends the format of email to support:

• Non ascii text
• Non text attachments
• Multi part message

Question 25

What are the three required MIME headers?

Answer 25

• MIME-version
• Content type
• Content-transfer-encoding

Question 26

What is the MIME content type?

Answer 26

Specifies the type and subtype of the content

Question 27

What is content-transfer-encoding?

Answer 27

This header specifies which one was used for encoding data

Question 28

What parts does an email consist of?

Answer 28

• Body
• Attachments
• Message headers
• Envelope headers

Question 29

What does the header contain information about?

Answer 29

• Sender
• Recipient
• Mail servers
• IP addresses
• Time stamps

Question 30

What is X-orginating - IP

Answer 30

The IP address message was composed on