04 Client Server Technology

Ins to FOR-IAN V. SANDOVAL
truc r:
ls u_it@ ya o o
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 Client-server computing or networking is a
distributed application architecture that partitions
tasks or work loads between service providers
(servers) and service requesters, called clients.
 Often clients and servers operate over a computer
network on separate hardware
 A server is a high-performance host that is a
registering unit and shares its resources with
clients.

 A client does not share any of its resources, but
requests a server's content or service function.
 Client-server describes the relationship between
two computer programs in which one program, the
client program, makes a service request to another,
the server program.
 Standard networked functions such as email
exchange, web access and database access, are
based on the client-server model.

 The client-server model has become one of the
central ideas of network computing. .
 Many business applications being written today
use the client-server model.
 Each instance of the client software can send data
requests to one or more connected servers. In turn,
the servers can accept these requests, process
them, and return the requested information to the
client.

1. Clients
2. Servers
 This typ o a hite ture is s m tim s re rre to a
e f rc c o e e fe d s
two-tier.
 It allows devices to share files and resources.
 The interaction between client and server is often
described using sequence diagrams. Sequence
diagrams are standardized in the Unified
Modeling Language.

1. Web Browsers
2. E-mail Client
3. Online Chat Client

1. Web Servers
2. FTP Servers
3. Application Servers
4. Database Servers
5. Name Servers
6. Mail Servers
7. Print Servers
8. Terminal Servers

 Another type of network architecture is known as
peer-to-peer, because each host or instance of
the program can simultaneously act as both a
client and a server, and because each has
equivalent responsibilities and status. Peer-to-
peer architectures are often abbreviated by P2P.

 Another type of network architecture is known as
peer-to-peer, because each host or instance of
the program can simultaneously act as both a
client and a server, and because each has
equivalent responsibilities and status. Peer-to-
peer architectures are often abbreviated by P2P.
 Both client-server and P2P architectures are in
wide usage today. Details may be found in
Comparison of Centralized (Client-Server) and
Decentralized (Peer-to-Peer) Networking.

 While classic client-server architecture requires
one of the communication endpoints to act as a
server, which is much harder to implement,
Client-Queue-Client allows all endpoints to be
simple clients, while the server consists of some
external software, which also acts as passive
queue (one software instance passes its query to
another instance to queue, e.g. database, and
then this other instance pulls it from database,
makes a response, passes it to database etc.).

1. A client-server architecture enables the roles and
responsibilities of a computing system to be
distributed among several independent
computers that are known to each other only
through a network.
2. All the data is stored on the servers, which
generally have far greater security controls than
most clients.
3. Since data storage is centralized, updates to that
data are far easier to administer than what would
be possible under a P2P paradigm.

4. Many mature client-server technologies are
already available which were designed to ensure
security, friendliness of the user interface, and
ease of use.
5. It functions with multiple different clients of
different capabilities.

1. Traffic congestion on the network has been an
issue since the inception of the client-server
paradigm.
2. The client-server paradigm lacks the robustness of
a good P2P network.

Computer networks can be classified into two broad
categories:
1. Local Area Network
A LAN is a communications network enables data
exchange between devices within a small
geographic area. Here, devices mostly refer to
computers and peripheral devices such as printer.
2. Wide Area Network
A WAN usually consists of a local connection of
LANs and spreads over a much larger
geographical area, sometimes even spanning the
globe.

 The Open Systems Interconnection Reference
Model (OSI Reference Model or OSI Model) is an
abstract description for layered communications
and computer network protocol design.
 It was developed as part of the Open Systems
Interconnection (OSI) initiative.
 It divides network architecture into seven layers
which, from top to bottom

1. Physical
2. Data Link
3. Network
4. Transport
5. Session
6. Presentation
7. Application

 A layer is a collection of conceptually similar
functions that provide services to the layer above it
and receives service from the layer below it.
 On each layer an instance provides services to the
instances at the layer above and requests service
from the layer below.
 Conceptionally two instances at one layer are
connected by a horizontal protocol connection on
that layer.

- 19 w rk o ala re m d l o ne o a hite ture
77, o n ye d o e f tw rk rc c
w ss rte a theInte tio l Org niza n fo
a ta d nd rna na a tio r
Sta a iza n (ISO) b g n tod ve p itsOSI
nd rd tio ea e lo
fra e o a hite ture
m w rk rc c
- tw m jo c m o nts a a s c m d l o ne o
o a r o p ne : n b tra t o e f tw rking ,
c lle theBa icRe re eMo e o s ve ye m d l,
a d s fe nc d l r e n-la r o e
a as t o s e ificp to o
nd e f p c ro c ls
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s e ts f e ig vo d m xp rie e ith
theC LADES ne o w h a o influe e Inte t
YC tw rk, hic ls nc d rne
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e ig

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9 d l w e ig a o um nte nd
ne o
tw rkings te isd e into la rs
ys m ivid d ye .
- Oneo m ree
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s p m nt tio lity nd a h
e ntity inte c d c o w thela r im e ia ly
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ne s ra t ith
c rre p nd e
o s o ing ntity a thes m la r in a the ho t.
t a e ye no r s

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hys a ye t nd w s ye
s ve ye OSI m d l o c m ute ne o
e n-la r o e f o p r tw rking.
 TheP ic l La r c m ris stheb s ha w re
hys a ye o p e a ic rd a
tra m s n te hno g so ane o
ns is io c lo ie f tw rk.
 TheP ic l La r d fine them a o tra m
hys a ye e s e ns f ns itting
ra b ra r tha lo ic l d tap c tso r ap ic l
w its the n g a a a ke ve hys a
link c nne tingne o no e .
o c tw rk d s
 TheP ic l La r p vid sa e c a m c nic l,
hys a ye ro e n le tric l, e ha a
a p c d l inte c tothetra m s n m d .
nd ro e ura rfa e ns is io e ium

1. Tra m s n fo a w h c n b e r d ita o
ns is io rm t, hic a e ithe ig l r
a lo .
na g
2 P ic l tra m s n m d , w h re rs to w the
. hys a ns is io e ium hic fe he r
b o d ta a tra m d a e c a o o tic l
its f a re ns itte s le tric l r p a
3 s na e o ing w h e p s s w t s na p tte
. Da lsnc d , hic m ha ize ha ig l a rns
igta .
re re e o s a ze e a the s hro tio
p s nt ne nd ro s nd ync niza n
b tw e s nd a re e
e e n e ing nd c ivingd vic s
e e.
4 P ic l m d
. hys a e ium a c e w h d a w w
tta hm nt, hic e ls ith iring
a p la utsc nne to .
nd in yo o c rs

 V.9 te p nene o m d m
2 le ho tw rk o e s
 IRDA P ic l La r
hys a ye
 USB P ic l La r
hys a ye
 Fire ire
w
 EIA RS-2 2 EIA-4 2 EIA-4 3 RS-4 9 RS-4 5
3, 2, 2, 4, 8
 ITU Re o m nd tio : s eITU-T
c m e a ns e
 DSL
 ISDN
 T1 a o r T-c rrie links a E1 a o r E-
nd the a r , nd nd the
c rrie links
a r

 10BASE-T, 10 BASE2 10
, BASE5 10 BASE-TX,
, 0
10 BASE-FX, 10 BASE-T, 10 0
0 0 0 BASE-T,
10 0
0 BASE-SX a o r va tie o theEthe t
nd the rie s f rne
p ic l la r
hys a ye
 Va tie o 8 2
rie s f 0 .11
 SONET/SDH
 GSM Umra io inte c p ic l la r
d rfa e hys a ye
 Blue o P ic l La r
to th hys a ye
 IEEE 8 20 .11x W P ic l La rs
i-Fi hys a ye
 Tra fe e P ic l La r
ns rJ t hys a ye
 Ethe o
rlo p
 ARINC 8 Avio sDig l Vid o Bus
18 nic ita e

 Ne o tra fe d tain “hunks o p c ts o a
tw rks ns r a c ” r a ke , f
c rta s
e in ize
 Da link la r fo sd tap c ts
ta ye rm a a ke
 Ma g sthe m ve e a e c no ein thene o
na e ir o m nt t a h d tw rk
 Ad sthea p p tea d s e o thes urc a
d p ro ria d re s s f o e nd
d s tio no e
e tina n d s
 In P -b s d LANs it isa thisla r tha p to o like
C ae , t ye t ro c ls
To n Ringa Ethe t a im le e d
ke nd rne re p m nte
 Func nsa o n p rfo e b ne o inte c
tio re fte e rm d y tw rk rfa e
c rd (NIC ) ins lle in c m ute
a s s ta d o p rs

 Ne o La r p vid sthefunc na a p c d l
tw rk ye ro e tio l nd ro e ura
m a o tra fe
e ns f ns rringva b le th d tas q nc s
ria le ng a e ue e
fro as urc toad s tio viao o m rene o
m o e e tina n ne r o tw rks
 P rfo sne o ro
e rm tw rk utingfunc ns fra m nta n,
tio , g e tio
re s e b a re o d live e r re o
a s m ly, nd p rt e ry rro p rts
 Ro rso e tea thisla r— s nd d tathro ho
ute p ra t ye e ing a ug ut
thee nd d ne o a m kingtheInte t p s ib
xte e tw rk nd a rne o s le
 Thelo ic l a d s ings he eishie rc a
g a d re s c m ra hic l
 TheInte t P to o (IP istheb s kno n e m le o
rne ro c l ) et w xa p s f
La r 3
ye

 TheTra p rt La r c ntro there b
ns o ye o ls lia ility o ag n
f ive
link thro h flo
ug w c ntro
o l, s g e tio
e m nta n/
d s g e tio
e e m nta n,
 a ic l rxantro so La r 4a theTra m s n
Typea ec m le f ye re
nd rro o p l ns is io
C ntro P to o (TC ) a Us r Da g mP to o
o l ro c l P nd e ta ra ro c l
(UDP )
 Fivec s e o c nne tio o etra p rt p to o
la s s f o c n-m d ns o ro c ls
ra ingfro c s 0to c s 4
ng m la s la s

Table 4.1 - Detailed characteristics of TP0-4 classes

 Re p ns lefo e ta lis
s o ib r s b hingvirtua c nne tio b tw e
l o c ns e e n
p c s e runningo d re c m ute
ro e s s n iffe nt o p rs
 Co c n isc lle as s io
nne tio a d es n
 P g m e inte c to thene o
ro ra m rs rfa e tw rk
 It ha le func nss h na ere o nitio
nd s tio uc m c g n,
a m tra n, a s c
d inis tio nd e urity in ane o
tw rk
 NetBIOS Exte e Us r Inte c (NETBEUI) is
nd d e rfa e
c m o us d p to o fo thes s io la r
o m nly e ro c l r e s n ye

 Re p ns lefo thed live a fo a
s o ib r e ry nd rm ttingof
info a n to thea p a n la r fo furthe
rm tio p lic tio ye r r
p c s ingo d p y
ro e s r is la
 Tra fo thefo a s nt b thea p a n la r into a
ns rm rm t e y p lic tio ye
c m o fo a
o m n rm t
 Tra la sthec m o fo a to afo a c s n b a
ns te o m n rm t rm t ho e y
a p a n la r
p lic tio ye
 Te ina e ula n isp rfo e a thisla r
rm l m tio e rm d t ye
 Thelo e t la r a w h a p a n p g m e
w s ye t hic p lic tio ro ra m rs
c ns e d tas turea p s nta n, ins a o
o id r a truc nd re e tio te d f
s p s nd d tain fo o d ta ra so p c ts
im ly e ing a rm f a g m r a ke
b tw e ho ts
e en s

 Ne o Op ra
tw rk e tingSys m(NOS) s ftw rere id sa
te o a s e t
thisla r
ye
 NOS s ftw reo rsne o s rvic sa p vid sthe
o a ffe tw rk e e nd ro e
a p a n la r w ind p nd nc fro lo e ve
p lic tio ye ith e e e e m w r-le l
d ta
e ils
 Ma a p a n b a stheNOS to inte c d c
ny p lic tio yp s ra t ire tly
w thes s io o tra p rt la r fo g a r c ntro
ith e s n r ns o ye r re te o l
o r ne o re o e
ve tw rk s urc s

 It s rve a theus r inte c thro h w h ne o
e s s e rfa e ug hic tw rk
re o e c n b a c s e
s urc s a e c e s d
 In TC /IP theAp lic tio La r c nta a p to o
P , p a n ye o ins ll ro c ls
a m tho stha fa into there lmo p c s -to
nd e d t ll a f ro e s -
p c s c m unic tio viaa Inte t P to o (IP
ro e s o m a ns n rne ro c l )
ne o us theTra p rt La r p to o to e ta lis
tw rk ing ns o ye ro c ls s b h
und rlyingho t-to s c nne tio
e s -ho t o c ns

1. Re o es ring
s urc ha
2 Re o filea c s
. m te c es
3 Re o p
. m te rinte a c s
r c es
4 Inte ro e sc m unic tio p rt
. r-p c s o m a n o
5 Re o p c d c ll s p rt
. m te ro e ure a up o
6 Ne o m na e e
. tw rk a g m nt
7. Dire to s rvic s
c ry e e
8 Ele tro m s a inginc inge a m s a ing
. c nic e s g lud -m il e s g

 Te t
lne
 Hyp rte Tra fe P to o (HTTP
e xt ns r ro c l )
 FileTra fe P to o (FTP
ns r ro c l )
 Sim leMa Tra fe P to o (SMTP
p il ns r ro c l )

 9 , P n 9fro Be La sd trib d files te
P la m ll b is ute ys m
p to o
ro c l
AFP Ap leFilingP to o
, p ro c l
AP C Ad nc d P g m -P g mC m unic tio
P , va e ro ra -to ro ra o m a n
AMQP Ad nc d Me s g Que
, va e sa e uingP to o
ro c l
BitTo nt
rre
Ato P lis
m ub hingP to o
ro c l
BOOTP Bo ts pP to o
, o tra ro c l
CFDP C he nt FileDis utio P to o
, o re trib n ro c l
DDS, Da Dis utio Se e
ta trib n rvic
DHC , Dyna icHo t C nfig tio P to o
P m s o ura n ro c l

De e t
vic Ne
DNS, Do a Na eSys m(Se e P to o
m in m te rvic ) ro c l
e nke
Do y
ENRP End o Ha le p c Re und nc P to o
, p int nd s a e d a y ro c l
Fa tTra k (Ka a Gro te iMe h)
s c Za , ks r, s
Fing r, Us r Info a n P to o
e e rm tio ro c l
Fre ne
e t
FTAM, FileTra fe Ac e sa Ma g m nt
ns r c s nd na e e
FTP FileTra fe P to o
, ns r ro c l
Go he Go he p to o
p r, p r ro c l
HL7, He lth Le l Se n
a ve ve

HTTP Hyp rte Tra fe P to o
, e xt ns r ro c l
H.3 3 P c t-Ba e Multim d C m unic tio
2 , a ke s d e ia o m a ns
Sys m
te
IMAP IMAP , Inte t Me s g Ac e sP to o
, 4 rne s a e c s ro c l
(ve io 4
rs n )
IRC , Inte t Re y C t P to o
P rne la ha ro c l
Ka e lia
dm
LDAP Lig e ht Dire to Ac e sP to o
, htw ig c ry c s ro c l
LP LineP
D, rinte Da m n P to o
r e o ro c l
MIME (S-MIME), Multip o eInte t Ma
urp s rne il
Exte io a Se ureMIME
ns ns nd c

Mo b
d us
Ne o
tc nf
NFS, Ne o FileSys m
tw rk te
NIS, Ne o Info a n Se e
tw rk rm tio rvic
NNTP Ne o Ne sTra fe P to o
, tw rk w ns r ro c l
NTC , Na na Tra p rta n C m unic tio fo
IP tio l ns o tio o m a ns r
Inte e Tra p rta n Sys mP to o
llig nt ns o tio te ro c l
NTP Ne o Tim P to o
, tw rk e ro c l
OSC AR, AOL Ins nt Me s ng r P to o
ta s e e ro c l
P NRP P e Na eRe o
, er m s lutio P to o
n ro c l

P , P 3 P s Offic P to o (ve io 3
OP OP , o t e ro c l rs n )
Rlo in, Re o Lo in in UNIX Sys m
g m te g te s
RTP Re l Tim P lis Sub c e
S, a e ub h s rib
RTSP Re l Tim Stre m P to o
, a e a ing ro c l
SAP Se s n Anno e e P to o
, s io unc m nt ro c l
SDP Se s n De c tio P to o
, s io s rip n ro c l
SIP Se s n Initia n P to o
, s io tio ro c l
SLP Se eLo a n P to o
, rvic c tio ro c l
SMB, Se r Me s g Blo k
rve sa e c
SMTP Sim leMa Tra fe P to o
, p il ns r ro c l
SNMP Sim leNe o Ma g m nt P to o
, p tw rk na e e ro c l

SNTP Sim leNe o Tim P to o
, p tw rk e ro c l
SSH, Se ureShe
c ll
SSMS, Se ureSMS Me s g P to o
c s a ing ro c l
RDP Re o De kto P to o
, m te s p ro c l
TC , Tra a tio C p b
AP ns c n a a ilitie Ap lic tio P rt
s p a n a
TDS, Ta ula Da Stre m
b r ta a
TELNET, Te ina Em tio P to o o TC /IP
rm l ula n ro c l f P
TFTP Trivia FileTra fe P to o
, l ns r ro c l
TSP Tim Sta pP to o
, e m ro c l
VTP Virtua Te ina P to o
, l rm l ro c l

W ka a HTTP re la e e p to o
a , n p c m nt ro c l
W is(a RW is Re o Dire to Ac e sP to o
ho nd ho ), m te c ry c s ro c l
W b
e DAV
X.4 0 Me s g Ha lingSe eP to o
0 , s a e nd rvic ro c l
X.5 0 Dire to Ac e sP to o (DAP
0, c ry c s ro c l )
XMP , Exte ib Me s g a P s nc P to o
P ns le s a ing nd re e e ro c l

Example of neither OSI Reference Model nor OSI protocols specify
any programming interfaces

04 Client Server Technology

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04 Client Server Technology