Firewall
The document discusses the features and functions of firewalls. It describes network policies, advanced authentication, packet filtering, and application gateways as key features. Network policies allow rules to control access, authentication verifies user identities, packet filtering examines incoming packets, and application gateways act as a proxy to hide individual computers. Firewalls can protect against threats like unauthorized access, malware, and denial of service attacks. However, they cannot protect against insider threats or connections that do not pass through the firewall like TOR. The conclusion states that firewalls aim to block threats while allowing necessary access, requiring network administrators to understand organizational needs.
Firewall
- 1. FIREWALL
- 2. FEATURES OF FIREWALL Network Policy Advanced Authentication Mechanism Packet Filtering Application Gateways
- 3. NETWORK POLICY In order to implement network policy , an organization can issue rules such as , only one computer from the entire network is allowed to establish an ftp connection i.e. to download some content we have to visit that one particular computer.
- 4. ADVANCED AUTHENTICATION While running an application you might be required to enter a user id and password. This help to ensure that malicious programs does not harm your devices, if you are confident about that application you can ask for the combination of id and password by the network admin.
- 5. PACKET FILTERING Packets received by the firewall are analyzed against a database of trusted resources, if verified than they are allowed through otherwise annoying message appears on the screen. Some firewall also logs such request with your IP and you may be later questioned about your intentions while making such request
- 6. APPLICATION GATEWAYS Popularly known by the name of application proxy or application level proxy the proxy establishes the connection with the destination behind the firewall and acts on behalf of the client, hiding and protecting individual computers on the network behind the firewall.
- 7. FIREWALL CAN SAVE US FROM Remote login Application backdoors SMTP session hijacking Operating system bugs Denial of service E-Mail bombs Spam Source routing
- 8. WHAT IT CAN’T DO Can’t protect you against malicious insiders Can’t protect you against connections that don’t go through it like TOR. Can’t protect against completely new threats.
- 9. CONCLUSION In order to protect ourselves from all the threats, we actually have to block everything, but that rules out logic of having an internet connection. Hence the proper way is to block everything and then allow what we need resulting in the need for a good network administrator who completely understands the need of an organization.