web engineering lcte 1

8/17/2019 Web Engineering Lcte 1

http://slidepdf.com/reader/full/web-engineering-lcte-1 1/24

WEB ENGINEERINGLECTURE #01



LAYERS OF THEINTERNET:



TCP/IP protocol family

IP : Internet Protocol

UDP : User Datagram Protocol

RTP, traceroute

TCP : Transmission Control ProtocoHTTP, FTP, ssh



WHT I! " I"T#R"#T$

% set of inter connecte& net 'or(s

% e)ample

% "et'or(s can *e completely &ifferent

% #thernet, T+, mo&em,

-TCP/.IP is 'hat lin(s them



% Routers -no&es. are &eices on multiple ne

that pass traffic *et'een them% In&ii&ual net'or(s pass traffic from one ro

en&point to another % TCP/IP hi&es the &etails as much as possi



I!0/0!I "#TW0R1 +0D#2

!een net'or( 3layers4

% 2ayer 5 : Physical 6 ca*les% 2ayer 7 : Data 2in( 6 ethernet

% 2ayer 8 : "et'or( 6 IP

% 2ayer 9 : Transport 6 TCP/UDP

% 2ayer : !ession

% 2ayer ; : Presentation

% 2ayer < : pplication



TCP/IP "#TW0R1 +0D#2

Different ie' 6 9 layers2ayer 5 : 2in( -'e &i& not loo( at &etails.

2ayer 7 : "et'or(

2ayer 8 : Transport

2ayer 9 : pplication



OSI Model TCP/IP Hierarchy Protocols

7th

Application Layer

6th

PresentationLayer

5th

Session Layer

4th

Transport Layer

3rd

et!or" Layer

#nd

Lin" Layer

$st

Physical Layer

ApplicationLayer

TransportLayer

et!or" Layer

Lin" Layer

2in( 2ayer : inclu&es &eice &rier an& net'or( interface car&

"et'or( 2ayer : han&les the moement of pac(ets, i=e= Routing

Transport 2ayer : proi&es a relia*le flo' of &ata *et'een t'o hosts

pplication 2ayer : han&les the &etails of the particular application



IP% Responsi*le for en& to en& transmission

%!en&s &ata in in&ii&ual pac(ets

% +a)imum si>e of pac(et is &etermine& *y the net'or(s% Fragmente& if too large

% Unrelia*le% Pac(ets might *e lost, corrupte&, &uplicate&, &eliere& out of or&er



IP DDR#!!#!

% 9 *ytes

% e=g= 5;8=5=57=?@% #ach &eice normally gets one -or more.

% In theory there are a*out 9 *illion aaila*le

% Aut



IP C2!!#!:TH#R# R# DIFF#R#"T C2!!#! 0F TH# IP WHICH

! F0220W!:

Class B57<

Class A 57@5?5

Class C 5?7787

Class D 7887



The Worl& Wi&e We*



TH# W0R2D WID# W#A

The Web % n infrastructure of information com*ine& an& the net'or( soft'access it

Web page

% &ocument that contains or references arious (in&s of &ata

Links

% connection *et'een one 'e* page an& another



Website

% collection of relate& 'e* pages

Web browser

% soft'are tool that retriees an& &isplays We* pages

Web server

% computer set up to respon& to reuests for 'e* pages



Uniform Resource Locator (URL)

% stan&ar& 'ay of specifying the location of a We* page, containhostname, E/E, an& a file



!#RCH #"I"#!

Search %n&ine % A w!"$ $%&$ %'(" )*+ ,-. *$%/ w!"$"



I"!T"T +#!!I"

Instant 'essa&in& (IM)

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% *"$ &(('&$*-" +" (/*(/$&/) (/*$**'" $%&$ .$&$ $% (/" */

* $% ""&"

% *"$ -"$&-$ ""&" &/ not "+/



W#A20!

Blog or Weblog% n online Gournal or ne'sletter that is freuently up&ate& an& inten&e& for

consumption



C001I#!

Coo"ie % A "&'' $$ ,' $%&$ & w! "// "$*/" *- )*+

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% $* +"$*; $% "$ */ +$+/ "$"% $* ('-$ "%*((- &/$" $%&$ &- ! &-$&-. /*

% C**" &/ not .&-/*+"



TH# D"! I!% T% <=*&- N& S)"$>

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% 3name space4% !erers ma(ing that name space aaila*le% Resolers -clients. 'hich uery the serers a*out the nam



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% The name space has a ma)imum &epth of 57< leels

% Domain names are limite& to 7 characters in length

% no&es &omain name i&entifies its position in the name space

web engineering lcte 1

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