Lec 4 - Protocols and TCP IP Suite

7/24/2019 Lec 4 - Protocols and TCP IP Suite

1/28

Background of Wireless

Communication

StudentPresentations andProjects

Wireless Communication

Technology

Wireless Networking and

Mobile IP

Wireless Local Area

Networks

Wireless Communication

Protocols and TCP/IP SuiteProtocols and TCP/IP Suite


2/28

Chapter 4


3/28

Key Features of a Protocol

Syntax

Concerns the format of the data blocks

Semantics Includes control information for coordination and

error handling

Timing

Includes speed matching and seuencing


4/28

!gents In"ol"ed in Communication

!pplications

#xchange data bet$een computers %e&g&' electronic

mail(

Computers

Connected to net$orks

)et$orks

Transfers data from one computer to another


5/28

TCP*IP +ayers

Physical layer

)et$ork access layer

Internet layer ,ost-to-host' or transport layer

!pplication layer


6/28


7/28

TCP*IP )et$ork !ccess +ayer

Concerned $ith the exchange of data bet$een an endsystem and the net$ork to $hich it0s attached

Soft$are used depends on type of net$ork

Circuit s$itching

Packet s$itching %e&g&' 1&23(

+!)s %e&g&' #thernet(

/thers


8/28

T.TCP*IP Internet +ayer

ses internet protocol %IP(

Pro"ides routing functions to allo$ data to tra"erse

multiple interconnected net$orks

Implemented in end systems androuters


9/28

TCP*IP ,ost-to-,ost' or Transport +ayer

Commonly uses transmission control protocol %tcp(

Pro"ides reliability during data exchange

Completeness /rder


10/28

TCP*IP !pplication +ayer

+ogic supports user applications

ses separate modules that are peculiar to each

different type of application


11/28

Protocol 5ata nits %P5s(


12/28

Common TCP*IP !pplications

Simple mail transfer protocol %S6TP(

Pro"ides a basic electronic mail facility

File Transfer Protocol %FTP( !llo$s files to be sent from one system to another

T#+)#T

Pro"ides a remote logon capability


13/28

+ayers of the /SI 6odel

!pplication

Presentation

Session Transport

)et$ork

5ata link Physical


14/28

/SI !pplication +ayer

Pro"ides access to the /SI en"ironment for users

Pro"ides distributed information ser"ices


15/28

/SI Presentation +ayer

Pro"ides independence to the application processes

from differences in data representation %syntax(


16/28

/SI Session +ayer

Pro"ides the control structure for communication

bet$een applications

#stablishes' manages' and terminates connections

%sessions( bet$een cooperating applications


17/28

/SI Transport +ayer

Pro"ides reliable' transparent transfer of data

bet$een end points

Pro"ides end-to-end error reco"ery and flo$ control


18/28

/SI )et$ork +ayer

Pro"ides upper layers $ith independence from the

data transmission and s$itching technologies used to

connect systems

7esponsible for establishing' maintaining' and

terminating connections


19/28

/SI 5ata link +ayer

Pro"ides for the reliable transfer of information

across the physical link

Sends blocks %frames( $ith the necessary

synchroni8ation' error control' and flo$ control


20/28

/SI Physical +ayer

Concerned $ith transmission of unstructured bitstream o"er physical medium

5eals $ith accessing the physical medium

6echanical characteristics

#lectrical characteristics

Functional characteristics

Procedural characteristics


21/28

Comparison of /SI and TCP*IP


22/28

TCP*IP !rchitecture 5ominance

TCP*IP protocols matured uicker than similar /SI

protocols

When the need for interoperability across net$orks

$as recogni8ed' only TCP*IP $as a"ailable and

ready to go

/SI model is unnecessarily complex

!ccomplishes in se"en layers $hat TCP*IP does$ith fe$er layers


23/28

#lements of Standardi8ation $ithin /SI

Frame$ork Protocol Specification

Format of protocol data units %P5s( exchanged

Semantics of all fields

!llo$able seuence of P5s

Ser"ice 5efinition Functional description that defines $hat ser"ices are

pro"ided' but not ho$ the ser"ices are to be pro"ided

!ddressing #ntities are referenced by means of a ser"ice access point

%S!P(


24/28

Internet$orking Terms

Communication net$ork 9 facility that pro"ides adata transfer ser"ice among de"ices attached to thenet$ork

Internet 9 collection of communication net$orks'interconnected by bridges*routers

Intranet 9 internet used by an organi8ation forinternal purposes Pro"ides key Internet applications

Can exist as an isolated' self-contained internet


25/28

Internet$orking Terms

#nd System %#S( 9 de"ice used to support end-userapplications or ser"ices

Intermediate System %IS( 9 de"ice used to connect

t$o net$orks :ridge 9 an IS used to connect t$o +!)s that use

similar +!) protocols

7outer - an IS used to connect t$o net$orks thatmay or may not be similar


26/28


27/28

)et$ork 5ifferences 7outers 6ust

!ccommodate !ddressing schemes

5ifferent schemes for assigning addresses

6aximum packet si8es

5ifferent maximum packet si8es reuires segmentation

Interfaces

5iffering hard$are and soft$are interfaces

7eliability )et$ork may pro"ide unreliable ser"ice


28/28

;

=

Lec 4 - Protocols and TCP IP Suite

Documents

Transcript of Lec 4 - Protocols and TCP IP Suite