to get information about the topicUDP client Java source code refer the page link bellow

import java.net.*;
import java.io.*;

class UDPclient
{
final static int ECHO_PORT=7;
DatagramPacket dp;
DatagramSocket ds;
byte msg=new byte;
String msgreceived;

try{

Reference: http://seminarsprojects.net/Thread-udp-client-java-source-code?pid=59708#pid59708#ixzz1gI81SfxE ....etc

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Introduction
With online business more important now than in yesteryears, importance of securing
data present on the systems accessible from the Internet is also increasing. If a
system is compromised for even a small time, it could lead to huge losses to the organization.
Everyday new tools and techiniques are devised to stop these malicious
attempts to access or corrupt data.
Traditionally firewall have been used to stop the intrusion attempts by an
attacker. But firewalls have static configurations that bloc ....etc

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Comparison and Contrast between the OSI and TCP/IP Model



Introduction

This presentation would discuss some comparison and contrast between the 2 main reference models which uses the concept of protocol layering.

Open System Interconnection Model (OSI)
Transport Control Protocol /Internet Protocol (TCP/IP)

The Session Layer

The Session layer permits two parties to hold ongoing communications called a session across a network.
Not found in TCP/IP model
In TCP ....etc

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FAIRNESS PROBLEM IN TCP AND UDP A STUDY AND SOLUTION ....etc

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TCP Connection Termination
each side terminates its end of the connection by sending a special message with the FIN (finish) bit set.This bit serves as a connection termination request to the other device. Both the sides have to finished the shut down procedure to end the connection completely. Thus connection termination is is a pair of two-way handshakes. . the TCP on the device receiving the initial termination request must inform its application process and wait for a signal that the process is ready to proceed.

Connectio ....etc

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difference between tcp session hijacking and udp session hijacking ....etc

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Selective Repeat is part of the automatic repeat-request (ARQ). With selective repeat, the sender sends a number of frames specified by a window size even without the need to wait for individual ACK from the receiver as in Go-Back-N ARQ. The receiver may selectively reject a single frame, which may be retransmitted alone; this contrasts with other forms of ARQ, which must send every frame from that point again. The receiver accepts out-of-order frames and buffers them. The sender individually retransmits frames that have timed out. ....etc

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// writing client server program using UDP

import java.net.*;
import java.io.*;

class UDPserver
{
final static int ECHO_PORT=7;
public static void main(String args)
{
DatagramSocket ds;
DatagramPacket dp;

try{
ds=new DatagramSocket(ECHO_PORT);
while(true){
dp=new DatagramPacket(new byte,1024);
ds.receive(dp);
dp=new DatagramPacket(dp.getData(),
dp.getLength(),dp.getAddress(),dp.getPort());
ds.send(dp);
}
}catch(IOException e){
System.out.println(could not recieve or send ....etc

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Chapter 2
Protocols and the TCP/IP Suite
Introduction
Layered protocol architecture
TCP/IP protocol suite
OSI reference model
Internetworking
The Need for a Protocol Architecture
Procedures to exchange data between devices can be complex
High degree of cooperation required between communicating systems

Example: File transfer
Requires a data path to exist
Tasks:
Activate data communication path
Source determines that destination is ready
File transfer app destination file management app is r ....etc

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