Internet Eng Ch1 200788

8/3/2019 Internet Eng Ch1 200788

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[email protected] Computer Networking:A Top Down Approach

Featuring the Internet,

3rd edition.Jim Kurose, Keith RossAddison-Wesley, July

2004.

http://groups.google.com/group/inteng-azad-uni


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Network Applications

.

:

.

.

)web Application:(

)

web browser(.


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.1Client/Server

.2P2P)Peer to Peer(

.3Hybrid


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Client/Server

ServerClient

.

WEBLoginEmail.

Clientserver

.

12


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Peer to Peer

Peer

.

P2P

Peer

PeerPeer.


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Hybrid

.

)Instant Message(Yahoo Messenger.

server)Client/Server(

Online)P2P(

P2PHybrid)edonkey.(


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process

process.

process

.Process

)messages(.

.


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process5TCP/IP

applicationtransport

networkdata linkphysical

applicationtransportnetworkdata linkphysical

applicationtransportnetworkdata linkphysical

message

ProcessA

ProcessBProcessC


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ProcessClient/Server

.

.

(Initial).

(listen).


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Socket

ProcessSocketProcess.

SocketProcess.

Process

.Socket

.SocketAPI

.

.

process

TCP withbuffers,variables

socket

host orserver

process

TCP withbuffers,variables

socket

host orserver

Internet

controlledby OS

controlled byapp developer


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Process)(lab:netstat

ProcessProcess

Process. .1:IP.2Process:

port

Client process

10.0.0.20:3023

server process

10.0.0.10:80


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(well Known)

portProcess.port80

port252021

porthttp://iana.org.


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1

netstat

.

)(netstat.


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2

.:

.

10.0.0.2/24.

IP IP

Accept TCP 80 any 10.0.10.0/24 10.0.0.0/24 1

:

:

:

:

:

:

:

:

:

:

:

:

:

:

Drop any any any Any Any Last


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.

.1

.2 (Syntax of messagetypes)

.3(Semantics of the fields)

.4 Process.


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.

.

)HTML(

HTTP

HTTP

.


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(Public-domain protocols)RFC

(interoperability)

HTTP:

RFC-2616HTTP.IEFirefoxOpera

ApacheIIS.

(Proprietary protocols):Napster, KaZaA


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:.1Data Loss:

.multimedia

..1Bandwidth:

(effective).

32Kbps .(elastic).

.1Timing)Delay:(

.


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Application Data loss Bandwidth TimeSensitive

file transfer no loss elastic no

e-mail no loss elastic noweb documents no loss elastic (few kbps) no

real-time

audio/video

loss-tolerant

audio: few kbps-1Mbps

video:10kbps-5Mbps

yes, 100s ofmsec

stored

audio/video

loss-

tolerant

same as above yes, few sec

interactivegames

loss-tolerant

few kbps-10kbps yes, 100s ofmsec

instantmessaging

no loss elastic yes and no


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TCP

::TCPclientServer.

.TCP

..

::process

TCP.::.

::

.


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UDP

UDP ..UDP

processU

DP process.

processUDP

UDP

U

DP.


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.

applications application-layer

protocol

underlying

transport protocole-mail SMT P [RFC 2821] TCP

remote terminal access Telnet [RFC 854] TCP

web HTTP [RFC 2616] TCP

file transfer FT P [RFC 959] TCPremote file server NFS [McKusik] UDP or TCP

streaming multimedia proprietary

(e.g., Real Networks )

UDP or TCP

internet telephony proprietary

(e.g., Net2Phone )

Typically UDP

Internet Eng Ch1 200788

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