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Tuesday, July 8, 2014

More on Networking


Network services
File Services-All the data files of an organisation are stored in one place and can be
shared by many users. Files can be organized and updated systematically.
Print Services- When Printers available on the Network , multiple users can print to
the same printer. The network printers are usually faster and more capable. They
may have accessories such as envelope readers or multiple paper trays
Database Services-Multiple users can have access to the database at the same time.
The Database software ensures integrity of data and provides multiple access.
Message Services-The services include Electronic mail, voice mail, remote
access,document transfers across the internet.
Application services- several software applications that are developed using
network architecture. The applications can be made available to multiple users. Any
up-gradation made to these applications is also instantly available to the users.

Advantages of Computer Network
Speed:- The files can be transferred from one Computer to another instantly.
Cost:- Application software(Network version) can be installed on one Computer and
accessed by other Computers on the Network. This makes maintenance and
upgrading of software easy.
Security:- The information on the computer can bemade available only through
password.Further some information can be made available only for reading and
not copying.
Resource sharing:- Expensive peripheral devices can be shared by many users in a
network.
Easy access:- Users can access information from any computer that is available on
the network. They need go to a specific Computer which may be located in a
different building or different location to retrieve information from their account.

Sunday, July 6, 2014

Status codes

Staus codes:-

Informational
Code :-100
Phrase :- Continue
Description:-The initial part of the request has been received , and the client may continue with the request.

Code :- 101
Phrase :- Switching
Description :- The server is complying with a client request to switch protocols defined in the upgrade header.


Success
Code :- 200
Phrase :- OK
Description :- The request is successful

Code :-201
Phrase :- Created
Description :- A new URL is created .

Code :- 202
Phrase :- Accepted
Description :- The request is accepted , but it is not immediately acted upon


Code :- 204
Phrase :-  No content
Description :-There is no content in the body


Redirection


Code :- 301
Phrase :- Moved permanently
Description :- The requested URL is no longer used by the server.


Code :- 302
Phrase :- Move temporarily
Description :- The requested URL has moved temporarily.


Code :- 304
Phrase :- Not modified
Description :-The document has not been modified.


Client Error

Code :- 400
Phrase :- Bad request
Description :- There is a syntax error in the request.


Code :- 401
Phrase :- Unauthorized
Description :- The request lacks proper authorization.


Code :- 403
Phrase :- Forbidden
Description :- Service is denied .


Code :- 404
Phrase :- Not found
Description :- The document is not found.


Code :- 405
Phrase :- Method not allowed
Description :- The method is not supported in this URL.


Code :-  406
Phrase :- Not acceptable
Description :- The format requested is not acceptable.
 



Server Error

Code :-500
Phrase :- Internal Server error
Description :- There is error , such as a crash , at the server site.

Code :- 501
Phrase :- Not implemented
Description :- The action requested cannot be performed.

Code :- 503
Phrase :-  Service unavailable
Description :-The service is temporarily unavailable ,but may be requested in the future.
 


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