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chapter five email internet ,intranet extranet, Lecture notes of Computer Science
this is about the email, internet ,extranet definition and function
Typology: Lecture notes
2019/2020
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Electronic mail (also known as e-mail ) :is one of the most commonly used services on the Internet.
Allows people to send messages to one or more recipients.
Email was invented by Ray Tomlinson in 1972.
Email addresses (both for senders and recipients) are two strings.
Separated by the character "@" (the "at sign"):
user@domain ◦ (^) The right-hand part describes the domain name involved, and ◦ (^) The left-hand part refers to the user who belongs to that domain.
An email address can be up to 255 characters long and can include the following characters: ◦ (^) Lowercase letters from a to z; ◦ (^) Digits ◦ (^) The characters ".","_" and "-" (full stop, underscore, and hyphen)
In practice, an email address often looks something like this: [email protected].
SMTP stands for Simple Mail Transfer Protocol.
SMTP is used when email is delivered from an email client, such as Outlook Express, to an email server or
When email is delivered from one email server to another.
SMTP uses port 25.
SMTP range
IMAP stands for Internet Message Access Protocol. (^) IMAP shares many similar features with POP3.
It is a protocol that an email client can use to download email from an email server. (^) However, IMAP includes many more features than POP3.
The IMAP protocol is designed to let users keep their email on the server. (^) IMAP requires more disk space on the server and more CPU resources than POP3, as all emails are stored on the server.
Pop3 and IMAP
Email makes it easy to keep a record of your communication. ◦ (^) You can save and refer to later copies of the emails you send as well as those you receive.
You can reach a lot of people at once. ◦ (^) It is possible to send one message to hundreds of recipients at once, or you can send a private message to one individual.
(^) Junk Mail (also referred to as spam). ◦ (^) Most email services now filter incoming mail and sort email messages that are most likely advertisements or scams into a folder called “spam.” (^) Friendly spam. ◦ (^) Try not to forward unnecessary messages to friends who may not ◦ (^) Appreciate hearing the latest list of “Top Ten Things...” (^) Misinterpretation. ◦ (^) Email arrives without tone or facial expressions, which can lead to misunderstanding. (^) Email messages can be passed on to others.
A network architecture in
which each computer or
process on the network is
either a client or a server.
Clients
Servers
Communication Networks Client Server
Computers or processes that manage network resources ◦ (^) Disk drives (file servers) ◦ (^) Printers (print servers) ◦ (^) Network traffic (network servers)
Example: Database Server ◦ (^) A computer system that processes database queries.
Networks Connect Clients and Servers