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 Web Technology Questions

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Q:

What are the principles in providing the security for the computer programs?

Answer

- The principle of least privilege is used to provide more security to the computer programs. 


- The principle allows the designing of the program such that any unauthorized access is not allowed and only the person who owns the program will be able to access it. 


- The services provided should be able to access only those products that need the services. 


- Web servers that are involved in responding the queries of the web users provide only accessing to the HTML files that will serve the purpose of the programs. 


- Computer programs should be made such that it provides secure features of logging into the program with proper authentication.

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Q:

What is the use of CSS sprites?

Answer

- A web page with large number of images takes a longer time to load. This is because each image separately sends out a http request.


- The concept of CSS sprite helps in reducing this loading time for a web page by combining various small images into one image. This reduces the numbers of http request and hence the loading time.

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Q:

What are the different web browser tools available to accelerate the speed of the web page?

Answer

- Web accelerators are used to increase the loading of the web page faster and by providing extra features of caching, etc. 


- There are tools that are provided like internet accelerator of browser accelerator that provides security from the spyware and adware programs. 


- The security from the programs are required as they are harmful for the computer and the tools uses the strategies of pre-caching in which the data is automatically cached and when the website is opened again then the fetching is being done from the place where the content is saved. 


- Registry tweaks are used to improve the performance offering the risk management techniques for downloading the resources.

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Q:

What is the use of Name based hosting?

Answer

- Name based is the virtual hosting that allows the virtual hosts to serve multiple hostnames that runs on single machine and having only one IP address.


- This is used when the web browser is used to request the resource from the server then the server respond using the hostname. 


- Web server uses HTTP protocol to respond to the requested hostname as the part of the request. 


- The server contains all the information of the website and the user that requests for the resources given. 


- Name based web hosting includes the resources and services that need to be given at the time of client’s request.

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Q:

Which method is used to draw an image on the canvas?

Answer

drawImage(image,x,y) method is used to draw an image on the canvas.

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Q:

What is the use of IP based hosting?

Answer

The web hosting on the server can be accomplished by using the IP based hosting that provides resources and services as follows:


- IP based hosting provides dedicated IPs that consists of virtual hosts and having the different IP address. 


- Web server is configured with different and multiple physical network interfaces using the same physical interface. 


- Web server uses this IP address to connect the client with the server to determine the web site that provides the client a view of it. 


- IP addresses provide the resources that are required in order to use the SSL certificates and other resources rather than shared certificate.

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Q:

How to create arrays in JavaScript?

Answer

Arrays are created by using new Array() in Java Script.


For example : var employees = new Array();


The elements to this array is assigned as follows :


employees[0] = "Kumar"


employees[1] = "Fedrick"

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Q:

How to set the cursor to wait in JavaScript?

Answer

The cursor can set to wait in JavaScript by using the property ‘cursor’ property. The following example illustrates the usage.


window.document.body.style.cursor = "wait"; 

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