Firewall in general use

Student: Fei Wang ID: 101917

Introduction

This research paper is to explore

firewall, one of Internet security

solution in following issues:

What is a firewall

The different types of firewalls

and how they work

Basic Firewall Design Decisions

What is a firewall?

A firewall typically guards an internal network against malicious access from the outside.

2. The different types of firewalls and how they work

Firewalls fall into four broad categories: packet filters circuit level gateways application level gateways stateful multilayer inspection

firewalls

Packet Filtering Firewall

Circuit level gateways

Application level gateways

Stateful multilayer inspection firewalls

3. Basic Firewall Design Decisions

determine stance of the firewall determine inbound access and

outbound access policy determine if dial-in or dial-out

access is required decide financial cost of the

firewall

Summary

The firewall is part of an overall security policy that creates a perimeter defense designed to protect the information resources of the organization. It is therefore necessary for an organization to have a well planned and strictly implemented security program that includes but is not limited to firewall protection.

Reference

http://www.vicomsoft.com/knowledge/reference/firewalls1.htmlhttp://www.3com.com/nsc/500619.html#Introductionhttp://www.interhack.net/pubs/fwfaq/http://compnetworking.about.com/compute/compnetworking/cs/firewallproducts/index.htm?rnk=r4&terms=Firewall+What+Is