Network security and vpn and nat applications in firewall

In this project every component which is including network security were examined and firewall ,NAT and VPN technology studies which is growing rapidly were discussed. To reach the aim, firstly general signal concepts , modulation varieties and transmission media were analyzed after that in following chapter ,TCP /IP and layer security were examined in local area network. In the third chapter wireless local area network and its security were analyzed. In the next step Security policies and firewall architecturals which is including network security were emphasized.In other chapter it was discussed how to guard on the network equipment and security were examined as a whole. In the conclusion, NAT and VPN technology studies in firewall which will be available in the future were introduced. Keywords: Network Security,Firewall , VPN, NAT