chapter 4 communicating on the internet. how e-mail works? most used feature tcp breaks &...
TRANSCRIPT
Chapter 4
Communicating on the Internet
How E-Mail Works?
Most used Feature TCP breaks & reassembles messages into
packets IP delivers packets to the proper location Binary files can be attached:
- Pictures- Video- sounds
How E-Mail Works?
How E-Mail Works?
Encoding schemes: MIME - UUencode Gateways perform translating email formats Mailing List: connects a group of people Everyone in the mailing list receive the sent
message Moderated mailing list: screened by Admin Unmoderated mailing list: wide open List server
How Spam Works? Spam:- Unsolicited junk e-mail sent by commercial
companies for some services- Unwanted mail, making another information
slower to send- E-mail filters block Spam from known
spammers
Spam Mails
How Usenet Newsgroups Work?
The world biggest discussion forum Special software, online services Thread: grouped conversation by topics FAQ: Many newsgroups have a list of
Frequently Asked Questions to read before submitting messages
Moderated newsgroups: screened by Admin
Unmoderated newsgroups: Automatically posted
Usenet Newsgroups
Usenet Server: you can subscribe to any interested newsgroups or cancel it
You can post Binary files UUencode: common used encoding scheme
for Usenet newsgroups
Usenet Newsgroups
Internet Relay Chat
Communicating with others (keyboard conversation)
IRC: Internet Relay Chat, the most popular chatting way
Channels: many different topics in chat rooms
IRC follows a client/ server model:
IRC ServerIRC Client
Making Phone Calls on the Internet
Sounds are broken into packets, which delivered by TCP/IP protocols
Free calls Making phone calls and receiving calls from
someone who has an Internet address WebTalk Speaking into microphones, listening from
speakers