Chapter 1: Introduction

 Introduction

Computer network is the engineering discipline concerned with communication between computer system and devices. The purposes of networking are exchange of data and resources sharing. With network, large volume of data can be exchanged through both short and long-range connections. Likewise computer resources such as hardware (printers, scanner etc.) and software can be remotely shared among network hosts.

     With increase reliance on computer network, calls for serious monitoring of the traffic in and out of the system network. Attackeron the internet could break into the network and do harm in a number of ways; they can steal or damage important data, damage individuals computer or their entire network, and use the internal network computer resources. Due to some of these security threats, there was the need to build a defensive mechanism that ensures that attackers and their likes are not allowed into the network. Firewalls are designed to stop unwanted or suspected traffics from flowing into the internal network. Sets of rules are applied to control the type of networking traffic flowing in and out of the system. This would ensure that attackers have no access to the internal network.

      This thesis is organized in four chapters. Chapter 2 provides theoretical background information about firewalls, roles, controls and their impact in network security; a comprehensive literature review on how network traffic can be monitored in order to prevent an unauthorized access to internal network. Chapter 3, we proposed and developed an improved software based solution that allows all the inbound and outbound traffic to pass through the firewall which, in turn determines which traffic should be allowed in or out of the network using object-oriented methodology. Chapter 4, Firewall security system was implementation using software-based solution. The use of Java programming language and the concept of xml and html programming were considered in order to achieve our objectives.

1.1 Statement of Problem

The problem to be solved is the problem of organizations network. What can firms do to protect their network over potential threats against the “resources” they share on the network?

1.2 Objectives

To developed a firewall system to block unauthorized access to the network and prevent malicious attack which could lead to data loss To build a secured network, based on software firewall to protect network resources and ensured the integrity and confidentiality of information on the network are not compromised

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