PowerPoint プレゼンテーション
Download
Report
Transcript PowerPoint プレゼンテーション
Internet
Hiroshi Toyoizumi
[email protected]
[email protected]
1
Introduction of the Internet
•
•
•
•
System of Internet
What can be done using Internet
Merit of Internet
Technologies in the Internet
Protocol
Routing
2
Stand Alone
• Computers are used to be standing
alone.
X
3
Connect two machines
• Sharing the information between two
machines.
Copying files etc.
4
Local Area Network (LAN)
• Connecting machines.
Hub
5
The Internet
domain
• Connecting LANs globally.
domain
Company A
Lab. D
Agency C
domain
University B
domain
domain
Provider E
6
What’s the Internet:
“nuts and bolts” view
• millions of connected
computing devices: hosts,
end-systems
pc’s workstations, servers
PDA’s phones, toasters
router
server
workstation
mobile
local ISP
running network apps
• communication links
regional ISP
fiber, copper, radio, satellite
• routers: forward packets
(chunks) of data thru
network
company
network
7
Domain
• The name of organization connected to the
internet.
waseda.jp
Waseda University
waseda.ac.jp
ntt.co.jp
NTT
kantei.go.jp Japanese government
8
Structure of Domain Name
• Domain name is consisted by the name,
attributes and nationality of organization.
http://www.internic.net/faqs/authoritative-dns.html
What is waseda.ac.jp?
“waseda” is the name of organization, “ac” represents
academia, and “jp” means japan.
Nationality
ca:Canada uk:United Kingdom fr:France au:Australia etc.
Attributes
co:company go:government ne:internet provider
Name
You can name it!
9
Address
• You need address to send a message to the
computer on the receiver side.
Use IP address or domain name.
IP address
Handled by computers.
164.125.25.10
Consisted by network number and computer number.
Domain name
tractable for human being
computer
----aoni.waseda.jp
mail
[email protected]
URL
----www.waseda.ac.jp
10
Example of address
Domain name
NTT
ntt.co.jp
address
den.ntt.co.jp
(210.173.163.201)
URL
www.abc.pref.fukushima.jp
Fukushima government
ルータ
Waseda
Domain name
waseda.ac.jp
address
Domain name
aoni.waseda.jp
pref.fukushima.jp
(202.225.207.18)
mail address
[email protected]
11
What you can do using internet
•
•
•
•
•
•
•
Browsing（ World Wide Web(WWW））
E-mail
FTP: file transfer
telnet: remote login to other computers
BBS (electric bulletin board)
Chat
Multimedia player (Video, music）
12
WWW
•System to make and look homepages.
•Using hyper link.
•Browsers
Netscape Navigator
Internet Explorer
•Making Home pages
Use HTML (Hyper Text Markup Language)
13
WWW(2)
• Netscape
Navigator
14
WWW(3)
• Internet Explorer
15
A Simple HTML Example
<html>
<head>
<TITLE> A Simple HTML Example </TITLE>
</head>
<body>
<H1> HTML is Easy To Learn </H1>
<P>Welcome to the world of HTML. This is the first paragraph. While short it is still a
paragraph!</P>
<P>And this is the second paragraph.</P>
<P>This is an example of link.
<A HREF="http://www.u-aizu.ac.jp/~toyo">Click it!</A>
</P>
<P>This is also an example of inline image. Can you find where the original is?<BR>
<IMG SRC=http://www.waseda.jp/sils/img/ph_title.jpg>
</P>
</body>
</html>
16
Result of the Simple HTML Example
QuickTimeý Dz
TIFFÅiLZWÅj êLí£ÉvÉçÉOÉâÉÄ
ÅB
ǙDZÇÃÉsÉNÉ`ÉÉǾå©ÇÈǞǽDžÇÕïKóvÇÇ•
17
E-mail
Outlook
18
E-mail
Outlook
19
FTP
• Transfer (get or put) files via network.
20
telnet
• You can access to other computers.
21
News, BBS
• You can discuss a specific topic and sharing information.
22
Chat
• Chat using text (or even voice).
23
Multimedia Player
• Play movies or music on the internet.
24
Advantages of internet
• You can access global information without going
there.
• You can communicate with people all over the
world.
• You can do business world wide.
• You don’t have to consider the national border.
• Distance education and distance medical care.
• Reduced cost of transportation.
25
Quiz
Explain what we can do using the following
applications.
(1)e-mail
(2)WWW
(3)ftp
(4)BBS
(5)telnet
(6)chat
(7)multimedia player
26
Internet Technology
• Protocol
• Routing
27
What is Protocol?
• Protocol is the rule for communication.
• As you need to follow the traffic rule when you
drive a car, you need to follow the rule during
communication.
• Internet employs a protocol called TCP/IP is
mainly used.
IP
TCP
Rule for controlling path along internet.
Rule for transfer data without error.
28
Hierarchy
Hierarchical Protcol
Data unit
Application
Presentation
Data unit
Add
header
Remove
header
Application
Presentation
Session
Session
Transport
Transport
Network
Data link
Network
Data link
Physical
Physical
Communication link
29
What is Routing
• You need to decide a path from source to destination in
order to transmit your data.
router
router
C office
1
A Ltd.
2
router
Routing table
destination
C office
B university
B University
Port #
1
2
30
Variation of routing
Routing methods
Static routing
• You don’t change the route which is decided at the
beginning.
Dynamic routing
• Depending on the network condition, the optimal route
is automatically found and configured.
31
Examples of Your Assignments
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Blog
Search Engines
Streaming Service
Instant Message
Internet Service Provider
ADSL
Peer-to-Peer
Hot Spot
XML
E-commerce
32
Procedure of group work
• Research
Select a topic and do research.
Study and discuss the findings.
• Preparation of Presentation
Arrange the findings.
Consider the effective ways to show your
finding.
Upload the related documents to the Web
server.
33
Midterm Exam Problem
(30 min.)
• Suppose you are a non-fiction writer. You are asked to write a nonfiction article about Bali-island on an on-line magazine.
• Describe how you prepare and write the non-fiction article by using
the power of internet. Use the following tools as many as you can
and explain how you are going to use it.
(1)e-mail
(5)telnet
(2)WWW (3)ftp
(6)chat
(4)BBS
(7)multimedia player
This is just an example of
Midterm Exam!
34
Easy steps
to submit your solution
1. Make a file describing your solution on your PC. You can use
anything to describe it, word, power point, plain-text, html…
2. Name the file with your student ID. For example, w1111111.doc.
3. Place your file on the shared folder as ordered in the class.
Or you can write your solution with pen and paper, and submit it by
your own HAND.
35