Complete Computer Knowledge Portal

Wednesday, July 30, 2014

Difference Between Cloud Computing and Grid Computing

Grid Computing
Cloud Computing
It is a collection of heterogeneous Computers from different locations to achieve a common goal.
It is the delivery of computing as a service rather than a product, where resources, software, and information are provided to Computers and Other devices as a utility.
It makes use of heterogeneous Computers to run.
It makes use of Homogeneous computers to run.
Focused on
Intensive Calculus
Standard and intensive cloud.
Not Much Reliable
Less than Grid
Research Community
Grid is distributed and has multiple user communities and is grouped in virtual organization.
It has generally one research community and a common group of system administrators that take care of entire domain.

Thursday, June 5, 2014

Difference Between Linux and Windows

It is an Operating System developed by Microsoft and  named Windows on November 20, 1985 as a graphical operating system shell for MS-DOS
Linux is a Unix Like Operating System introduced by Linus Torvalds and was first released on 5 October 1991.
License Type
Proprietary Commercial Software and must have to be Purchased before using Windows OS.
Except Red Hat all versions are free and are distributed under GNU GPL License.
File System Supported

Ext,Ext2, Ext3, Ext3, ReiserFS, FAT, ISO 9660, UDF, NFS, NTFS, JFS, XFS, Minux
and GmailFS

Windows XP, Windows Vista, Windows 7, Windows 8, Windows 8.1 etc.
Red Hat, Suse Linux, Debian, Knoppix, Ubuntu etc.

Wednesday, June 4, 2014

Difference Between HTML 4 and HTML 5

HTML 4.01
HTML 5.0
Doctype Declaration
Three Types of <!DOCTYPE> declarations are used in HTML 4.01 and that are:
i) HTML 4.01 Strict
ii) HTML 4.01 Transitional
iii) HTML 4.01 Frameset
There is Only one type of <!DOCTYPE> declaration in HTML 5 and that is <!DOCTYPE html>only.
Plugin Requirement
External Plugins are required to play audio and video files on HTML 4.01.
HTML 5 does not require any external plugin to play audio and video files.
Accept, Accept-charset, Action, Enctype, Method, Name, Target.
Accept-charset, Action, Enctype, Method, Name, Target, Autocomplete, Novalidate.
Input Types
Button, Checkbox, File, Hidden, Image, Password, Radio, Reset, Submit, Text.
Button, Checkbox, File, Hidden, Image, Password, Radio, Reset, Submit, Text, Color, Date, Datetime, Datetime-local, email, Month, Number, Range, Search, Tel, Time, Url, Week
Automatic Validation
Not Supported in HTML 4.01 and is achieved by other Scripting Languages.
Automatic Filed Validation is Supported in HTML 5.0

Sunday, June 1, 2014

Difference Between DBMS and RDBMS

Acronym for
Data Base Management System
Relational Data Base Management System
Data is stored in flat file oriented System and no relations are used.
It provides facility to create relation between tables.
Dr. E.F. Codd Rules
Only 3 rules, Out of 12, are followed by DBMS. (from Rule 0 to Rule 12)
Minimum 6 rules, Out of 12, are followed by RDBS. (from Rule 0 to Rule 12)
Data Security
It can’t implement constraints in Tables and has less Security. The ACID (Atomicity, Consistency, Isolation and Durability) property of the database is ensured by Programmer.
It can implement the integrity constraint for the purpose of holding ACID (Atomicity, Consistency, Isolation and Durability) property of the database and is much securing than DBMS.

Wednesday, May 28, 2014

Difference Between Windows 8 and Windows 8.1

Windows 8
Windows 8.1
It is a Personal Computer Operating System Designed by Microsoft and is preceded by Windows 7 Operating System.
It is enhanced version of windows 8 operating system.
Start Button
Start Button is not Present in Windows 8.
Start Button is restored to task bar in Windows 8.1 to open start screen.
App  Snapping
Only two app can be snapped onto a single display.
4 Applications can be snapped onto a single display depending upon screen size.
Message App
Message App is available in Windows 8.
Message is Replaced by Skype, which allows users to accept calls directly from lock screen.

Wednesday, May 21, 2014

Difference Between Database and Data Warehouse

Data Warehouse
Organized Collection of Data is called database.
Database of Databases is Called Data Warehouse.
It is designed to allow the definition, creation, querying, update, administration of data (Transaction Processing).
It is a relational database that is designed for query and analysis rather than transaction processing.
Data Type
Data stored in Database is up to date.
Current and Historical Data is Stored in Data Warehouse.
Transaction Oriented: e.g. Each Transaction of Bank Customer is written to database and is interpreted as Accounting Database.
Subject Oriented: The data in the data warehouse is organized so that all the data elements relating to the same real-world event or object are linked together.

Tuesday, May 20, 2014

Difference Between Data Mining and Machine Learning

Data Mining
Machine Learning
Data mining is a process to extract information from a data set and transform it into an understandable structure for further use.
It is a Technique that concerns the construction and study of systems that can learn from data.
It focuses on the discovery of unknown properties in the data.
It focuses on prediction, based on known properties learned from training data.
Database Size
It is an automatic or semi-automatic analysis that is performed on large quantities of data.
It is generally performed on small databases to increase accuracy.
Association Rules
Sequential Patterns
Sequence Similarity
Un Supervised

Monday, May 12, 2014

Difference Between Blackbox and Whitebox Testing

Black Box Testing
White Box Testing
It is a Software Testing Technique that examines the functionality of an Application without peering into its working or coding.
It is a Software Testing Technique to test internal structure and working of an Application Software.
Technique Applied in
This Technique Applied in Unit, Integration, System and Acceptance levels of Software Testing Process.
This Technique Applied in Unit, Integration and system levels of Software Testing Process.
Test Procedures
For Black box Testing Specific knowledge of the application's coding/internal structure and programming in general is not required.
For White box Testing Specific knowledge of the application's coding/internal structure and programming is required.

Difference Between MAC and IP address

MAC Address
IP Address
Acronym for
media access control address
Internet Protocol Address
Used for
It is a unique identifier that is assigned to network interfaces for communicating on the physical network segments.
It is a numerical value that is assigned to all the participating devices in a network. i.e. Servers, Computers, Printers, WAP, Laptops etc.
Provided BY
It is generally provided by the manufacturer of the NIC cards and is stored in its hardware.
It is provided by the ISP (Internet Service Provider) or by the Network Administrator.

Sunday, March 2, 2014

Difference Between OSI and TCP/IP Reference Models

OSI Reference Model
TCP/IP Model
Clarification between Services, Interfaces and Protocols
OSI Model clearly distinguishes between Services, Interfaces and Protocols. Each layer performs some services to upper layers, layer interfaces tells the processes above it how to access it, and different protocols are used by different layers as per their needs until a job is not finished.
TCP/IP model does not clearly distinguish between Services, Interfaces and Protocols.
Protocol Biasing
This model is not biased for a particular set of protocols and was developed before corresponding protocols invention.
This Model was developed after inventing corresponding protocols and just was description of existing protocols.
It is a Seven Layered Model. Which are as follows :
a)      Physical Layer
b)      Data Link Layer
c)       Network Layer
d)      Transport Layer
e)      Session Layer
f)       Presentation Layer
g)      Application Layer
It is a 4 Layered Model. Which are as follows:
a)      Subnet Layer
b)      Internet Layer
c)       Transport layer
d)      Application Layer

Thursday, February 6, 2014

Difference Between Synchronous TDM and Statistical TDM

Synchronous TDM
Statistical TDM
In Synchronous TDM data flow of each input connection is divided into units and each input occupies one output time slot.
In Statistical TDM slots are allotted dynamically. i.e. input line is given slots in output frame if and only if it has data to send.
No. of Slots
In Synchronous TDM no. of slots in each frame are equal to no. of input lines.
In Statistical TDM, No. of slots in each frame are less than the no. of input lines.
Buffering is not done, frame is sent after a particular interval of time whether someone has data to send or not.
Buffering is done and only those inputs are given slots in output frame whose buffer contains data to send.
Slots in Synchronous TDM carry data only and there is no need of addressing. Synchronization and pre assigned relationships between input and outputs that serve as an address.
Slots in Statistical TDM contain both data and address of the destination.