Firewall technologies is
methodology use to shield computer or network against unauthorized person or
treat .Network firewalls could also be hardware devices, software system
programs, or a mix of the two. This technologies use hardware or software
package firewalls use to observe and limit the flow of data through a network
in keeping with outlined rules that has set by the user .All the traffic from
outside to within the computer or network should through it'll be exanimate by
local rules security policy .If the traffic is abide by to the rules policy
it'll enable to access or blocked if conflict with policy. In OSI model Firewall find in layer seven that is that the application layer: there's 4
kinds of Firewall :
Packet filter: This not
enable the packet to access the network by rules that has been set by user
Application Layer: This firewall
work on application layer such TCP, FTP and telnet by intercept any packet
enter or leave through this application
Proxies: Offers a network service
to permit clients to create indirect network connections to alternative network
services.
Network Address Translation:
method of modifying IP address data in IP packet headers whereas in transit
across a traffic routing device.
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