Firewalls课件.ppt

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Firewalls Presented By Hareesh Pattipati 精品文档 Outline Introduction Firewall Environments Type of Firewalls Future of Firewalls Conclusion 精品文档 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 精品文档 Firewall Environments 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 精品文档 DMZ Environment Can be created out of a network connecting two firewalls Boundary router filter packets protecting server First firewall provide access control and protection from server if they are hacked 精品文档 DMZ ENV 精品文档 VPN VPN is used to provide secure network links across networks VPN is constructed on top of existing network media and protocols On protocol level IPsec is the first choice Other protocols are PPTP, L2TP 精品文档 VPN 精品文档 Intranets An intranet is a network that employs the same types of services, applications, and protocols present in an Internet implementation, without involving external connectivity Intranets are typically implemented behind firewall environments. 精品文档 Intranets 精品文档 Extranets 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 精品文档 Type is Firewalls Firewalls fall into four broad categories Packet filters Circuit level Application level Stateful multilayer 精品文档 Packet Filter Work at the network level of the OSI model Each packet is compared to a set of criteria before it is forwarded Packet filtering firewalls is low cost and low impact on network performance 精品文档 Packet Filtering 精品文档 Circuit level Circuit level gateways w

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