6
ISDN Disadvantages
The disadvantage of ISDN lines is that it is very costly than the other typical telephone system.
ISDN requires specialized digital devices just like Telephone Company.
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OR
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17.(b) (i). Explain the working of image tag with example.[5]
Insert Image
We can insert any image in your web page by using
<img>
tag. Following is the simple syntax to
use this tag.
<imgsrc="Image URL" ... attributes-list/>
The <img> tag is an empty tag, which means that it can contain only list of attributes and it has
no closing tag.
Example
To try following example, let's keep our HTML file test.htm and image file test.png in the same
directory:
<!DOCTYPE html>
<html>
<head>
<title>Using Image in Webpage</title>
</head>
<body>
<p>Simple Image Insert</p>
<imgsrc="/html/images/test.png"alt="Test Image"/>
</body>
</html>
17(b) (ii). Explain about web server and web browser.[5]
Web server
Web server is a computer where the web content is stored. Basically web server is used to host
the web sites but there exists other web servers also such as gaming, storage, FTP, email etc.
Web site is collection of web pages while web server is a software that respond to the request for web
resources.
Web Server Working
Web server respond to the client request in either of the following two ways:
Sending the file to the client associated with the requested URL.
Generating response by invoking a script and communicating with database
Key Points
When client sends request for a web page, the web server search for the requested page if
requested page is found then it will send it to client with an HTTP response.
If the requested web page is not found, web server will the send an HTTP response:Error 404 Not
found.
If client has requested for some other resources then the web server will contact to the application
server and data store to construct the HTTP response.
Web Browser
Web Browser is an application software that allows us to view and explore information on the
web. User can request for any web page by just entering a URL into address bar.Web browser can show
text, audio, video, animation and more. It is the responsibility of a web browser to interpret text and
commands contained in the web page.