Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
| Question | Answer |
|---|---|
| allows a message to handle text, audio and video, and message can be sent to more than one recipients | |
| who created email? | Ray Tomlinson (1972) - a service that copied a file from one machine to another and appended it to a recipients mailbox |
| General architecture of email | Message User Agent (MUA); Message Transfer Agent (MTA); Message Accessing Agent (MAA); |
| Message User Agent (MUA) | a program to read/write emails (Outlook, Thunderbird) |
| Message Transfer Agent (MTA) | forwards emails to mailboxes of recipients (SMTP) |
| Message Accessing Agent (MAA) | pulls message from server (POP & IMAP) |
| Sender Spool-File | each message to be sent is placed in a designated spool-file by MUA |
| Mailbox | where delivered mails are placed |
| 1st Scenario - sender and receiver are on same system | Sender > MUA > System > MUA > Receiver |
| 2nd Scenario - sender and receiver on different system | Sender > MUA > MTA Client > Internet > MTA Server > MUA > Receiver |
| 3rd Scenario - sender is connected to mail server via LAN/WAN | Sender > MUA > MTA Client >> MTA Server > MTA Client > Internet > MTA Server > MUA > Receiver |
| 4th Scenario - bothe sender and receiver are connected to mail server via LAN/WAN | Sender > MUA > MTA Client >> MTA Server > MTA Client > Internet > MTA Server > MAA Server >> MAA Client > MUA > Receiver |
| jobs done by MUA | compose, read, reply, forward, handle mailbox |
| Format of email | Envelope { Message { Header, Body } } |
| Envelope | contains all information necessary for transmission delivery |
| Header | contains To, From, Subject and MIME |
| Body | contains message and ASCII Characters |
| MIME | Multipurpose Internet Mail Extension (transfer non-text data) |
| ASCII | American Standard Code for Information Interchange (transfers text data only) |
| Transport Mechanisms (PUSH) | SMTP |
| SMTP | Simple Mail Transfer Protocol |
| Fetch Mechanisms (PULL) | POP and IMAP |
| POP | Post Office Protocol (lets users fetch emails from server) |
| IMAP | Internet Message Access Protocol (check email header; search contents before downloading; edit mailboxes; create hierarchy of mailboxes for email storage) |
| Both sender and receiver in permanent internet connection | Sending Host > SMTP > Internet > Receiving Host |
| Sender online, receiver not online | Sending Host > SMTP > ISP Machine > POP3 > Receiver PC |
| Spam | unsolicited advertising that is sent from email servers that allows relaying |
| relaying | false sender address; server receives message with plenty of recipients |
| spam solution | Basic Checks (email servers should verify sender/receiver address); Server Blacklist (blacklist servers that send/relay spam); Legal solutions |
Created by:
narrthine
Popular Computers sets