Some Important File Extensions

Hello friends you all have heard about lot of file extensions,some extensions are very popular and you know little bit about them but you don't have any knowledge about remaining extensions....................
                                   I share with all of you some commonly used file extensions(also have some new extensions) ,i hope you'll learnt this extensions and get some knowledge.

1. .doc:-Microsoft Word Document
2. .docx:-Microsoft Word Open Xml Document(this is similar to .zip file)
3. .log:-Log File
4. .msg:-Outlook Mail Messages
5. .odt:-Open Document Text Document 
6. .pages:-Pages Document(Created by apple)
7. .rtf:-Rich Text Format File
8. .txt:-Plain Text File
9. .wpd:-Word Perfect Document
10. .wps:-Microsoft Works Word Processor Document
11. .csv:-Comma Separated Values File
12. .dat:-Data File
13. .epub:-Open ebook File(digital ebooks are saved in this format)
14. .key:-Keynote Presentation
15. .pps:-Powerpoint Slides
16. .ppt:-Powerpoint Presentation
17. .pptx:-Powerpoint Presentation Open Xml Document
18. .tar:-Consolidated Unix File Archive
19. .xml:-Extensible Markup Language
20. .aif:-Audio Interchangable File Format
21. .iff:-Interchangable File Format(created by electronics art)
22. mp3:-Mp3 Audio File
23. .ra:-Real Audio
24. .wma:-Windows Media Audio
25. .wave:-Wave Audio File
26. .avi:-Audio Vedio Interleave File
27. .flv:-Flash Vedio File
28. .mov:-Apple Quik Time Movie
29. .rm:-Real Media File
30. .wmv:-Windows Media Vedio
31. .obj:-Wavefront 3d Object File
32. .bmp:-Bitmap Image File
33. .gif:-Graphical Interchange Format File
34. .jpg:-JPEG file
35. .pdf:-Portable Document Format File
36. .xlr:-Works Spreadsheet
37. .xls:-Excel Spreadsheet
38. .xlsx:-Microsoft Excel Open Xml Spreadsheet
39. .dbf:-Database File
40. .pdb:-Program Database
41. .sql:-Structured Query Language
42. .mdb:-Microsoft Access Database
43.  .app:-Mac OS X Application
44. .bat:-Batch File
45. .com:-Dos Commands File
46. .exe:-Windows Executable File
47. .gadget:-Windows Gadget
48. .jar:-Java Archive File
49. .pif:-Program Information File
50. .vb:-VBScript File
51. .wsf:-Windows Script File
52. .asp:-Active Server Page
53. .aspx:-Active Server Page Extended File
54. .css:-Cascading Style Sheet
55. .htm:-Hypertext Markup Language
56. .php:-Hypertext Preprocessor File
57. .jsp:-Java Server Page
58. .xhtml:-Extensible Hypertext Markup Language
59. .fnt:-Windows Font File
60. .dll:-Dynamic Link Library
61. .drv:-Device Driver
62. .sys:-Windows System File
63. .7z:-7-Zip Compressed File
64. .rar:-Winrar Compressed Achive
65. .gz:-Gnu Zipped Archive
66. .tar.gz:-Tarball Compressed File
67. .zip:-Zipped File
68. .zipx:-Extended Zip File
69. .bin:-Binary Disc Image
70. .vcd:-Virtual CD
71. .c:-C Source Code File
72. .class:-Java Class File
73. .cpp:-C++ Source Code File
74. .java:-Java Source Code File
75. .cs:-Visual C# Source Code File
76. .pl:-Perl Script
77. .py:-Python Script
78. .bak:-Backup File
79. .temp:-Temporary File
80. .msi:-Windows Installer Package
81. .part:-Partially Downloaded File
82. .torrent:-BitTorrent File 

"Thankss Friends!!!!!!!!!!!!!!!!!! For Listning Me I Know After Read These Extensions You are become Enthusiastic"

Topologies In Computer Network

The logical layout of the cable and devices that connect the nodes of the network is called Topology.Network designers consider several factors when deciding which topology or combination of topologies to use:the type of computer and cabling(in any) in place,the distance between computers, the speed at which data must travel around the network,and the cost of setting up the network.
                              Data moves through the network in a structure called "Packets".Packets are pieces of a message broken down into small units by sending PC and reassembled by the receiving PC.Different networks format packets in different ways,but most packets have two parts:the header and the payload.the "header" is the first part of the packets,which contains information needed by the network.
The header identifies the node that sent the packet(the source),and provides the address of the node that will recieve the packet(the destination).The network reads each packet's header to determine where to send the packet and, in some cases,to determine the best way to get it to its destination.The header also holds control data that helps the recieving node reassemble a message's packets in the right order.The "payload"is the actual data that is being transmitted between the two nodes.
                                                       A network topologies and related technologies are important for two reasons.first,a correctly designed network,using the most appropriate topology for the organization's needs,will move data packets as efficiently as possible.second,the network topology play a role in preventing collision,which is what happens when multiple nodes try to transmit data at the same time..

      TYPES OF TOPOLOGIES>>>>>>>>>>>>>>>>>>>>>>>>

1. BUS TOPOLOGY: A bus topology network uses one cable,all the nodes and peripheral devices are connected in a series to that cable.A special device, called a terminator, is attached at the cables's start and end points,to stop network signals so they do not bounce back down back down the cable.This topologies main advantage is that it uses the least amount of cabling of any topology.

                               

  2. STAR TOPOLOGY: The star topology is probably the most common topology.In a star    network,all the nodes are connected to device called hub and communicate through it.Data packets travel through the hub and are sent to the attached nodes,eventually reaching their destinations.some hubs known as intelligent hubs can monitor traffic and help prevent collisions.In star topology,a broken connection between a node and the hub does not affect the rest of the network.If the hub is lost,however ,all the nodes connected to thet hub are unable to communicate.

    3.RING TOPOLOGY:The ring topology connects the network's nodes in a circular chain,with each node connected to the next.The last node connected to the first,completing the ring.Each node examines data as it travels through the ring.if the data known as a token is not addressed to the node examining it,the node passes to the next node.There is no danger of collisions because only one packet of data travels the ring at a time .If the ring is broken,however ,the entire network is unable to communicate.

    4.MESH TOPOLOGY:The mesh topology is the least-used network topology and the most expensive to implement.In a mesh environment,a cable runs from every computer to every other computer.If you have four computers,you must six cables-three coming from each computer to the other computers.The big advantage to this arrangement is that data can never fail to be delivered ,if one connection goes down there are other ways to route the data to its destination.

                   "Thanks friends I hope you all learnt about topologies in computer network"

Window$ 7 Shortcut$

Friends as you all know about WINDOWS 7,you are almost familiar with it because it is user friendly and provide a lovely environment to work in Graphical User Interface(GUI).................."Graphical User Interface is nothing but it  provides you to input through pointing device like mouse,it also requires Desktop Metaphor(pointing device shows on your desktop allow you to click on on any directory or folder and icon to perform any task)".


Here i present a lot of shortcuts which you can try in windows 7 to work faster and faster and faster.

1. Windows logo+E=Open My Computer
2. Windows logo+R=Open Command Prompt(DOS)
3. Windows logo+U=Open Ease Of Access Centre
4. Windows logo+M=Minimise Any Window
5. Windows logo+Shift+M=Maximise Any Window
6. Windows logo+F=Search Any Thing
7. Windows logo+P=You Can Connect Your Laptop To Projector
8. Windows logo+L=Locked The Keyboard
9. Windows logo+X=Open Windows Mobility Centre
10. Windows logo+B=Show Hidden Icons In Task bar
11. Windows logo+F1=Open Windows Help
12. Windows logo+D=Display Desktop
13. Windows logo+T=Show Windows Which Are Present in Your Task bar(Minimised Windows)
14. Windows logo+Tab=Show 3d view

               "Thanks Friends,I hope you all learn a lot of shortcuts by learn this blog"