Client-Server Model

1
Client-Server Model
2
Table of Contents

• Client
• Server
• Client-Server Network
• Client-Server Model
• Client-Server Model (Continued)

• Categories of Client-Server Approach
• 7One-Tier Architecture
• Two-Tier Architecture
• Three-Tier Architecture
• N-Tier Architecture
• Benefits of Client-Server Model

3
CLIENT

• Clients are also referred to as service
  requesters. Clients are those computer hardware
  or server software which request resources and
  services that are provided by a server. Client
  computing can be classified as thick, thin or
  hybrid. 
• Thick Client- A thick client is one that offers
  rich functionality and carries out most of the
  data processing. It depends very less on the
  server.
• Thin Client- A thin client refers to a
  lightweight computer which depends on the
  resources of the host computer to a great extent.
  
• Hybrid Client- A hybrid client is a combination
  of a thick clients and a thin clients
  characteristics. It depends on the server for
  storing persistent data. It is capable of local
  processing.

4
Server

• YELLOW
• Any device or computer program that lets other
  devices or programs have functionality is known
  as a server. A server refers to any computerized
  process that is used or called upon by a client
  for the purpose of sharing resources and
  distributing work. There are application servers,
  database servers, computing servers, web servers
  etc.
• Web servers are the servers that are provided by
  web hosting companies for hosting web pages. It
  is these web hosting companies that make websites
  accessible over the Internet and are often termed
  as the Best Website Hosting Company, the Best
  Windows Hosting Company or the Top Cloud
  Hosting Company when they excel in their
  services.

5
Client-Server
Network

• A client-server network refers to the medium that
  enables clients to access resources and services
  from a central computer by using either the LAN
  (Local Area Network) or the WAN (Wide Area
  Network).
• Network traffic is categorized as either
  client-to-server or as server-to-server.
  Client-server networks major advantage is that
  it ensures a centralized management of
  applications as well as data.
• The most popular network services are, e-mail,
  file sharing and the World Wide Web. In the
  context of the World Wide Web, there are numerous
  websites that can be accessed over the Internet.
  These websites are kept up and running by web
  hosting companies. These companies that are also
  known as web hosts, provide the server space,
  services and the technologies that are needed to
  make a website accessible. Terms such as the
  Best Website Hosting Company, the Best Windows
  Hosting Company and the Top Cloud Hosting
  Company refer to the top-notch website hosting
  service providers.

6
Client-Server
Model
The client-server model refers to a distributed
application framework. It divides tasks between
servers and clients that are present either in
the same system or interact over a computer
network or the Internet. In it the client sends a
request to another program for the purpose of
accessing a service that is made available by a
server. One or more programs are run by the
server that are meant for sharing resources with,
as well as distributing work, among clients.
7
Client-Server Model
(Continued)
The client server model functions by
communicating in a messaging pattern that
involves requestresponse. It must follow a
common communications protocol in which the
language, rules and the dialog patterns that are
to be used are formally defined. The TCP/IP
protocol suite is followed by the client-server
communication. The connection is maintained by
the TCP protocol till the time the client and the
server are through with the message exchange. A
scheduling system organizes and prioritizes
client requests. The client-server model lets any
computer utilize other hosts shared resources
and aids in expanding its capabilities.
8
Categories of Client-Server Approach
There are four categories of client-server
approach. These are, one-tier architecture,
two-tier architecture, three-tier architecture
and N-tier architecture. These will be discussed
in more detail in the following slides.
9
1-800-123 -8156

• Whoa! Thats a big number, arent you proud?

10
One-Tier Architecture
One-tier architecture involves a program being
run on a single computer, wherein there is no
requirement regarding access to the network. In
it, network protocols are not managed by user
requests. Hence, the code remains simple and
there isnt any extra traffic on the network.
11
Two-Tier Architecture
A two-tier architecture involves the server, the
client, as well as the protocol by which the two
tiers are linked. In it the code related to the
Graphical User Interface exists on the client
host and the server host has the domain logic.
12
Three-Tier Architecture
A three-tier architecture involves a presentation
tier (User Interface layer), the application tier
(service layer which performs detailed
processing) and the data tier that has a database
server for storing information.
13
N-Tier Architecture
An application is divided into logical layers by
an N-tier architecture. This separates
responsibilities as well as manages dependencies
and physical tiers that are run on separate
machines. Moreover, it improves scalability and
adds latency. N-Tier architecture can be either
closed-layer or open-layer. In closed-layer, each
layer can communicate only with the next layer
that is below it. In open-layer, a layer can
communicate with any of the layers that are below
it.
14
Benefits
of Client-Server Model
The client-server model has many advantages which
are mentioned below. Facilitates protection of
data and manages easily user authorization and
authentication. Addition of resources (servers,
network segments and computers) to a
client-server network without encountering any
major interruption. Ensures access to data in an
efficient manner without the clients and the
server being in close proximity. Facilitates easy
upgrades, relocation of the nodes and
replacements. The data that gets transferred is
platform-agnostic.
15
Thanks!

• ANY QUESTIONS?

• You can find me at
• www.htshosting.org
• 
  support_at_htshosting.org