1. Basic Network (the Internet) Applications
Kittiphan Techakittiroj

2. Agenda Telnet: using other computer ftp: transfer files
send message
world wide web: information retrieval

3. Telnet connect to server machine local machine act as “terminal
text based communication
transmit only “text”
GUI is possible through terminal emulation
simple implementation

4. What does it need to work?
Telnet
What does it need to work?
Host name
hostname.domainname
au1.au.ac.th cwsysf.cwru.edu whitehouse.org
domainname = localname.globalname
purpose, e.g. edu, org, gov, net, mil
country, e.g. th, us, jp, tw, be, tv, to
account or permission
identification = userid+password

5. Example: most TCP/IP implementation
Telnet
Example: most TCP/IP implementation
au1% telnet btl4.eng.au.edu
Trying
Connected to btl4.eng.au.edu.
Escape character is '^]'.
[SSL not available]
Welcome to Linux
btl4 login: admin
Password: *******
Linux
Last login: Wed May 5 10:40:17 on ttyp0 from
No mail.
btl4:~$

6. Telnet
Terminal Emulator
improving “user interface” of telnet by terminal Emulator
(Dump Terminal)
ANSI
IBM 3270
VT100/102 (most popular)
VT240/340 (graphics enhancement)

7. Telnet: Terminal Emulator
Example: MS Windows Telnet

8. E-mail Electronics mail transfer information from one to the other
act as postal mail
batch processing or off-line communication
text based communication
transmit only “text”
binary (graphics, sound) need encoding

9. What does it need to work?
What does it need to work?
access to system
mail-reader to receive mails
mail-composer to send mails
destination =
information or data
text
binary need encoding before send and decoding after

10. Example: UNIX mail (get)
Example: UNIX mail (get)
hostname:~$ mail
Mail version 8.1 6/6/93. Type ? for help.
"/var/spool/mail/admin": 5 messages 1 new
1 Mon Mar 8 15:56 77/3907 "OPNET News: LOCKHEED "
2 Mon Apr 12 14:49 98/2622 "work = money?"
3 Wed Apr 14 21:02 307/10179 "JDC Tech Tips No."
4 Fri Apr 30 00:21 576/42551 "Re: About Your Course"
>N 5 Wed May 5 11:19 14/424 "test"
& 5
Message 5:
From Wed May 5 11:19:
Date: Wed, 5 May :19:
From: Administrator
To:
Subject: test
Cc:
test of system on "btl4.eng.au.edu"
& q
Saved 1 message in mbox
Held 4 messages in /var/spool/mail/admin
hostname:~$

11. Example: UNIX mail (send)
Example: UNIX mail (send)
hostname:~$ mail
Subject: test 2
this is the second test .
Cc:
hostname:~$ mail
Mail version 8.1 6/6/93. Type ? for help.
"/var/spool/mail/admin": 2 messages 1 unread
1 Fri Apr 30 00:21 576/42551 "Re: About Your Course"
>U 2 Wed May 5 11:23 14/423 "test 2"
& 2
Message 2:
From Wed May 5 11:23:
Date: Wed, 5 May :23:
From: Administrator
To:
& q
Saved 1 message in mbox
Held 1 message in /var/spool/mail/admin
hostname:~$

12. Example: Netscape Messenger (get)
Example: Netscape Messenger (get)

13. Example: Netscape Messenger (send)
Example: Netscape Messenger (send)

14. FTP File Transfer Protocol sharing files via network
transfer information from one to the other
transfer files between remote host (server) and local host (client)
file = information
large or small
text or binary

15. What does it need to work?
FTP
What does it need to work?
Hostname: server location
hostname.domainname
au1.au.ac.th cwsysf.cwru.edu ftp.whitehouse.org
account or permission
identification = userid+password
specific access
public access
file location: directory and name

16. Example: most TCP/IP implementation
FTP
Example: most TCP/IP implementation
btl4:~$ ftp btl4.eng.au.edu
Connected to btl4.eng.au.edu.
220 btl4.eng.au.edu FTP server (Version wu academ
[BETA-15](1) Wed May :45:04 CDT 1998) ready.
Name (btl4.eng.au.edu:admin): admin
331 Password required for admin.
Password: *******
230 User admin logged in.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> get /etc/hosts ./hosts
local: ./hosts remote: /etc/hosts
200 PORT command successful.
150 Opening BINARY mode data connection for /etc/hosts
(621 bytes).
226 Transfer complete.
621 bytes received in secs (6.8 Kbytes/sec)
ftp> quit
221 Goodbye

17. FTP
Example: ws_ftp

18. WWW
World Wide Web
huge information systems: (text, graphics, audio, video, etc.) in hyper-text and hyper-media format
allow the use of “telnet”, “ftp”, “ ”
need to know only the location
URL://location
ftp://ftp.au.ac.th/

19. Example: Lynx WWW GABAC School of Engineering (p1 of 3) Home History
[INLINE]
Announcement Academic Society Departments Programs Admission Facilities
& Services
Welcome to the Faculty of Engineering
Assumption University of Thailand
Hot News
[INLINE] M.Eng. Application period!! click here for more information.
[INLINE] Engineering Day is coming click here for more information.
A Principle Objective of the Faculty of Engineering is To Develop Engineers
who have Academic and Hands On Experience in the Most Recent Technologies.
-- press space for next page --
Arrow keys: Up and Down to move. Right to follow a link; Left to go back.
H)elp O)ptions P)rint G)o M)ain screen Q)uit /=search [delete]=history list

20. WWW
Example: Neoplanet

21. WWW
Example: Netscape