BNT403 - WEB TECHNOLOGIES

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ASSIGNMENT

WINTER	2013
PROGRAM	BSc NT
SEMESTER	iv
SUBJECT CODE & NAME	BNT403 - WEB TECHNOLOGIES
CREDIT	4
BK ID	B1547
MAX. MARKS	60

Questions

1. Describe the following:’

a) TCP

Answer : TCP (Transmission Control Protocol)

TCP (Transmission Control Protocol) is a set of rules (protocol) used along with the Internet Protocol (IP) to send data in the form of message units between computers over the Internet. While IP takes care of handling the actual delivery of the data, TCP takes care of keeping track of the individual units of data (called packets) that a message is

b) IP

Answer : What is an IP address?

The IP Address is a unique number assigned to your computer connection by your home or office or employer's Internet Service Provider (ISP). This unique number serves as the ID of your connection when it's accessing the Internet. It functions like your street address—if someone wants to send you mail or you order a pizza, your address is needed for the postman or delivery person to find your home. The same process applies to your computer, your IP address is used to route information from the Internet to your computer.

c) UDP

Answer : UDP (User Datagram Protocol)

UDP (User Datagram Protocol) is a communications protocol that offers a limited amount of service when messages are exchanged between computers in a network that uses the Internet Protocol (IP). UDP is an alternative to the Transmission Control Protocol (TCP) and, together with IP, is sometimes referred to as UDP/IP. Like the

d) FTP

Answer : File Transfer Protocol (FTP)

File Transfer Protocol (FTP) is a standard Internet protocol for transmitting files between computers on the Internet. Like the Hypertext Transfer Protocol (HTTP), which transfers displayable Web pages and related files, and the Simple Mail Transfer Protocol (SMTP), which transfers e-mail, FTP is an application protocol that uses the Internet's TCP/

e) HTTP

Answer : HTTP - HyperText Transfer Protocol

Short for HyperText Transfer Protocol, the underlying protocol used by the World Wide Web. HTTP defines how messages are formatted and transmitted, and what actions Web servers and browsers should take in response to various commands. For example, when you enter a URL in your browser, this actually sends an HTTP command to the Web server directing it to fetch and transmit the requested Web page.

2.Define DHTML. Explain any four components of DHTML

Answer : Dynamic HTML, or DHTML, is an umbrella term for a collection of technologies used together to create interactive and animated web sites[1] by using a combination of a static markup language (such as HTML), a client-side scripting language (such as JavaScript), a presentation definition language (such as CSS), and the Document Object Model.

3.What is event driven programming? Explain the three types of patterns in event-driven programming.

Answer : An event-driven application or programming is a computer program that is written to respond to actions generated by the user or the system. In a computing context, an event is any identifiable occurrence that has significance for system hardware or software. As such, events include both user-generated actions like mouse clicks and keystrokes and system-generated events such as program loading.

4.List and explain XMLHttpRequest object properties

Answer : The XMLHttpRequest Object

The XMLHttpRequest object is used to exchange data with a server behind the scenes.

The XMLHttpRequest object is the developers dream, because you can:

5.Explain three types of array supported by PHP with an appropriate example.

Answer : An array is used to store multiple values in one variable.

When To Use An Array

Arrays are used when you want to group many similar variables. For example, you may want to create a variable for a color. Instead of creating 5 different variables, each with its own color, you can create an array of colors.

6.What is application object? Explain any three methods of application objects.

Answer : Application Object

An application on the Web may consist of several ASP files that work together to perform some purpose. The Application object is used to tie these files together.

The Application object is used to store and access variables from any page, just like the Session object. The difference is that ALL users share ONE Application object (with Sessions there is ONE Session object for EACH user).

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