Internet Basics
Selected Reading
- Internet Discussion
- Internet Useful Resources
- Internet Quick Guide
- PHP
- JavaScript
- CSS
- HTML
- Firewall Security
- Digital Signature
- Data Encryption
- Internet Security Overview
- Social Networking
- Online Education
- Usenet Newsgroup
- Mailing List
- Collaboration Overview
- Search Engines
- Proxy Servers
- Web Servers
- Web Browsers
- Web Pages
- WWW Overview
- Website Monetization
- Search Engine Optimization
- Website Security
- Website Hosting
- Website URL Registration
- Website Publishing
- Websites Development
- Website Designing
- Websites Types
- Websites Overview
- E-mail Providers
- E-mail Security
- E-Mail Etiquettes
- E-mail Features
- E-Mail Operations
- E-Mail Working
- E-Mail Protocols
- E-Mail Overview
- Internet Protocols
- Internet Connectivity
- Internet Services
- Internet Domain Name System
- Internet reference Models
- Extranet Overview
- Intranet Overview
- Internet Overview
- Home
Selected Reading
- Who is Who
- Computer Glossary
- HR Interview Questions
- Effective Resume Writing
- Questions and Answers
- UPSC IAS Exams Notes
Firewall Security
Firewall Security
Firewall is a barrier between Local Area Network (LAN) and the Internet. It allows keeping private resources confidential and minimizes the security risks. It controls network traffic, in both directions.
The following diagram depicts a sample firewall between LAN and the internet. The connection between the two is the point of vulnerabipty. Both hardware and the software can be used at this point to filter network traffic.
There are two types of Firewall system: One works by using filters at the network layer and the other works by using proxy servers at the user, apppcation, or network layer.
Key Points
Firewall management must be addressed by both system managers and the network managers.
The amount of filtering a firewall varies. For the same firewall, the amount of filtering may be different in different directions.