30-07-2013, 04:35 PM
Firewall
Firewall.ppt (Size: 1.74 MB / Downloads: 31)
INTRODUCTION
Firewalls control the flow of network traffic
Firewalls have applicability in networks where there is no internet connectivity
Firewalls operate on number of layers
Can also act as VPN gateways
Active content filtering technologies
ENVIRONMENT
There are different types of environments where a firewall can be implemented.
Simple environment can be a packet filter firewall
Complex environments can be several firewalls and proxies
Extranet
Extranet is usually a business-to-business intranet
Controlled access to remote users via some form of authentication and encryption such as provided by a VPN
Extranets employ TCP/IP protocols, along with the same standard applications and services
FUTURE
Firewalls will continue to advance as the attacks on IT infrastructure become more and more sophisticated
More and more client and server applications are coming with native support for proxied environments
Firewalls that scan for viruses as they enter the network and several firms are currently exploring this idea, but it is not yet in wide use