2 Marks IP

41. List the advantages of CGI scripting?

1. CGI programs are relatively safe to run.

2. A CGI program can crash without damaging the server, since it only has limited

access to the server.

3. Reduces the burden of server

a. Sends prepared messages / mails e customer reply

b. Capability to process forms and prepares output based on form input.

c. Hit counts / Page counters.

42. Explain about Session tracking.

A session is basically a conversation between a browser and a server. All the above

technologies can save information for the current session for a particular user visiting a site.

The session is important, as H1TP is a stateless protocol. This means that the connection

between web server and a web browser is not automatically maintained, and that the state of a

web session is not saved.

State is a general term that includes "everything about your situation" and the specifics

vary based on the application. In a word processor, the state of the application would include

which windows are open, where they are on the screen, and what files you most recently used.

In a web application, the state would include any data that you had entered, the results of any

queries that you had run, and your security access information (e.g. whether you have logged

in to the site).

43. Define packet switched networks.

Packet switched network means that data traveling on the network is broken into chunks

called packets and each packet is handled separately.

44. Define socket.

The socket is a software abstraction used to represent the terminals of a connection

between two machines or processes.

45. What are the basic operations of client sockets?

Connect to a remote machine

Send data

Receive data

Close a connection

46. What are the basic operations of Server socket?

Bind to a port

Listen for incoming data

Accept connections from remote machines on the bound port

47. List all the socket classes in java.

Socket

ServerSocket

Datagram Socket

Multicast Socket

Secure sockets

48.What the Socket Object does?

Socket object is the java representation of a TCP connection when a socket is created; a

connection is opened to the specified destination.

49. What is meant by Server Socket?

ServerSocket represents a listening TCP connection. Once an incoming connection is

requested, the ServerSocket object will return a Socket object representing the connection.

50. What do you mean by DatagramSocket and DatagramPacket?

DatagramSocket represents a connectionless datagram socket. This class works with the 

DatagramPacket class to provide for communication using the UDP protocol.