part 3: internet applications the basics of networking, part 3 chapter 3
TRANSCRIPT
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Part 3: Internet Applications
The Basics of Networking, Part 3
chapter3
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Slide 3-2
THE MEDIUM OF THE MESSAGE
> Application layer protocols: HTTP, HTTPS, POP3, IMAP, SMTP, SSH, Telnet, FTP, P2P, . . .
> Internet services that make use of these protocols: the WWW, e-mail, session access, newsgroups, file sharing, . . .
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Slide 3-3
WWW is an Internet Application
Key Point: Internet applications (HTTP, Napster, Gnutella, email, chat, etc.) are implemented by special application protocols (OSI layer 7) running on top of the Internet protocols (TCP/IP, OSI layers 1-4).
The WWW is an Internet Application
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Slide 3-4
P2P File Sharing Networks
When most people hear the term "P2P", they think of peer to peer file sharing over the Internet
P2P file sharing systems have become the single most popular class of Internet applications in this decade.
CIS 110 Technical note: A P2P network implements search and data transfer protocols above the Internet Protocol (layer 3)
P2P uses special Layer 4 protocol, not TCP
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Slide 3-5
P2P is an Internet Application
Key Point: Internet applications (WWW, Limewire, BitTorrent, email, chat, . . .) are implemented by special application protocols (OSI layer 7) running on top of the Internet protocols:TCP/IP (OSI layers 1-4, “Packet Layer”)
P2P networks are Internet Applications
To access a P2P network, users simply download and install a suitable P2P client application
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Slide 3-6
Top P2P File Sharing Programs
• eDonkey
• Shareaza
• WinMX
• BitTorrent
• Limewire
• Morpheus
• eMule
• Ares
• BearShare
• Kazaa
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Slide 3-7
Summary, Part 3, Internet Applications
Key Point: Internet applications use application protocols (OSI layer 7) running on top of the Internet protocols (TCP/IP, OSI layers 1-4).
The WWW is an Internet Application P2P, SSH, email, FTP, … are Internet
Applications
Next: Ch. 4: XHTML and the WWW
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Slide 3-8
Web 1.0 Analogy
by Philip Greenspun, photo.net.
The computer is the steam engine. The network is the railroad.
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Slide 3-9
Web 2.0 Analogy: universal virtual
computer
Tim O'Reilly is the founder/CEO of O'Reilly Media
applications revolve around the network as the planets revolve around the Sun
universal virtual computer,the internet as operating system.
> Office 2.0
> Cloud Computing
> Web OS
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Slide 3-10
Web 2.0 Analogy: universal virtual
computer
Back in 2001, Clay Shirky (www.shirky.com) retold the old story about Thomas J. Watson, founder of the modern IBM. "I see no reason for more than five of these machines in the world," Watson is reputed to have said. "We now know that he was wrong," Clay went on. The audience laughed knowingly, thinking of the hundreds of millions, if not billions, of computers deployed worldwide. But then Clay delivered his punch line: "We now know that he overstated the number by four."
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Slide 3-11
Web 2.0 Analogy: universal virtual
computer
Tim O'Reilly is the founder/CEO of O'Reilly Media
applications revolve around the network as the planets revolve around the Sun
universal virtual computer,the internet as operating system.
> Office 2.0
> Cloud Computing
> Web OS