Server vs Client in real life and in programming world

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Server vs Client in real life and
in programming world

Manoj Kumar
Senior Consultant III
manoj.kumar@neudesic.com 14 June, 2012


Client ???

Clients are PCs or workstations on which
users run applications.

Clients rely on servers for resources, such
as files, devices, and even processing power.


Client - Examples


Server ???

Servers are powerful computers or processes
dedicated to managing disk drives (file servers),
printers (print servers), or network traffic
(network servers ).


Client-Server interaction in real world


Client-Server interaction in programming world

The Client/Server computing is an environment that satisfies the
business need by appropriately allocating the application
processing between the client and the server processors.

The client/server computing is fundamentally platform
independent.


Characteristics of the Client and the Server
1. Service: Server is provider of services. The client is a consumer of
services.
2. Shared Resources
3. Asymmetrical protocols
4. Transparency of location
5. Mix-and-match: Independent of hardware or operating system
software platforms

6. Message-based exchanges: Loosely coupled systems
7. Encapsulation of services
8. Scalability: Can be scaled horizontally or vertically
9. Integrity

Merits of the Client Server

1. Enhanced Data Sharing
2. Integrated Services
3. Sharing Resources among Diverse Platforms
4. Data Interchangeability and Interoperability
5. Location Independence of Data and Processing
6. Greater ease of maintenance
7. Far greater security controls
8. Easy availability of proven technology


Demerits of the Client Server

1. Traffic congestion on the network
2. Lacks the robustness of a good P2P network

Under client-server, should a critical server fail, clients’ requests cannot
be fulfilled.


Peer-to-Peer (P2P) network

 Resources are usually distributed among many nodes
 Even if one or more nodes depart and abandon a downloading file  The remaining nodes
should still have the data needed to complete the download
 More than one PCs are linked and Share information without running through an
independent server computer
 All connected PC’s are at once a server and a client
 A P2P network can be any connection
 Linked through a Universal Serial Bus
 A permanent system which ties a many computers in a small workplace over
copper wires
 Grander scope where specific protocols and programs setup direct
connections between users online


Typical Peer-to-Peer (P2P) network

Example:
 Napster
 Gnutella
 Napigator
 Wrapster
 Torrents


Client-Server in programming world
Step 1: The Browser
Makes an HTTP Request
for an ASP.NET Web Page

Step 2: The Web Server
Receives the HTTP
Request

Step 3: Examining the
ASP.NET Engine

Step 4: Generating the
Output


Demo – IIS (Internet Information Services)


Desktop Database Systems


Client/Server Database Systems


Decision points for a client-server architecture:


Browser as a Client
 Download page contents
 Display HTML – Process HTML, Validate
HTML
 Render dynamic HTML from Javascript
 Apply styling (CSS)
 Show images
 Handle events
 Manage state (Cookies)
 Local data (Temporary files)
 Manage plugins
 Manage security
 Etc…..100s more things….


Client technologies/languages/tools

 HTML
 Plugins
 JavaScript
 VBScript
 CSS/Images
 JS class libraries
 Debugging tools: Firebug / IE Developer tool, Fiddler


Server technologies/languages/tools

 Web Server - IIS
 Worker process
 ASP.Net
 ASP.Net MVC
 C#/VB
 VBScript
 ASP
 JavaScript
 WCF
 Debugging tool: Visual Studio IDE


Q&A


Test
1. Which of the following items are not necessary for client/server?
A. Assure that tools will connect with middleware.
B. Understand the requirements.
C. Determine network bandwidth capabilities.
D. Include the use of a file server.

2. A server cannot serve on which of the following levels?
A. Client Layer
B. Business Layer
C. Database Layer
D. All of the above.


Test
3. Client/server environments use a local area network (LAN) to support a network of
personal computers, each with its own storage, that are also able to share common
devices and software attached to the LAN?
A. True B. False

4. Centralized systems are more susceptible to security threats than client/server
architectures?
A. True B. False


Test
5. Client/server architecture describes?
A. A system used to improve customer service to clients.
B. An arrangement of networked computers connected to a more powerful server
computer.
C. A more powerful server computer and standalone PCs.
D. Computers of equivalent performance and function.

6. Which is not a type of server?
A. File.
B. Database.
C. Applications.
D. Laser.
E. Network.


Answers for Test:

1. D
2. A
3. True
4. False
5. B
6. D


Thank You
Manoj Kumar
manoj.kumar@neudesic.com


Server vs Client in real life and in programming world

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