The presentation is on the Hyper Text Transfer Protocol and Electronic Mail

1. HTTP AND EMAIL

2. HTTP
Slide 2Presented by Pankaj Debbarma, Asstt. Prof.
Deptt. of Computer Science & Engineering, TIT
The Hypertext Transfer Protocol (HTTP) is a protocol used
mainly to access data on the World Wide Web. HTTP
functions as a combination of FTP and SMTP.
HTTP uses the services of TCP
on well-known port 80.

3. Figure 27.12 HTTP transaction
Slide 3Presented by Pankaj Debbarma, Asstt. Prof.
Deptt. of Computer Science & Engineering, TIT

4. ELECTRONIC MAIL
Slide 4Presented by Pankaj Debbarma, Asstt. Prof.
Deptt. of Computer Science & Engineering, TIT
One of the most popular Internet services is electronic
mail (e-mail). The designers of the Internet probably never
imagined the popularity of this application program. Its
architecture consists of several components that we discuss
in this chapter.
Topics discussed in this section:
• Architecture
• User Message
• Transfer Agent: SMTP
• Message Access Agent: POP and IMAP
• Web-Based Mail

5. Figure 26.9 Fourth scenario in electronic mail
Slide 5Presented by Pankaj Debbarma, Asstt. Prof.
Deptt. of Computer Science & Engineering, TIT

6. Figure 26.10 Push versus pull in electronic email
Slide 6Presented by Pankaj Debbarma, Asstt. Prof.
Deptt. of Computer Science & Engineering, TIT

7. Figure 26.11 Services of user agent
Slide 7Presented by Pankaj Debbarma, Asstt. Prof.
Deptt. of Computer Science & Engineering, TIT

8. Note on User Agents
Slide 8Presented by Pankaj Debbarma, Asstt. Prof.
Deptt. of Computer Science & Engineering, TIT
Some examples of GUI-based user agents are
Eudora, Outlook, and Netscape.
Some examples of command-driven user agents
are mail, pine, and elm.

9. Figure 26.12 Format of an e-mail
Slide 9Presented by Pankaj Debbarma, Asstt. Prof.
Deptt. of Computer Science & Engineering, TIT

10. Figure 26.13 E-mail address
Slide 10Presented by Pankaj Debbarma, Asstt. Prof.
Deptt. of Computer Science & Engineering, TIT

11. Figure 26.14 MIME
Slide 11Presented by Pankaj Debbarma, Asstt. Prof.
Deptt. of Computer Science & Engineering, TIT

12. Table 26.5 Data types and subtypes in MIME
Slide 12Presented by Pankaj Debbarma, Asstt. Prof.
Deptt. of Computer Science & Engineering, TIT

13. Table 26.6 Content-transfer-encoding
Slide 13Presented by Pankaj Debbarma, Asstt. Prof.
Deptt. of Computer Science & Engineering, TIT

14. Figure 26.16 SMTP range
Slide 14Presented by Pankaj Debbarma, Asstt. Prof.
Deptt. of Computer Science & Engineering, TIT

15. Figure 26.19 POP3 and IMAP4
Slide 15Presented by Pankaj Debbarma, Asstt. Prof.
Deptt. of Computer Science & Engineering, TIT