◆ What is IPsec?   IPsec,Encryption systemUsed to protect the security of data at the network layer by the technology It is a protocol to be done. IPsec consists of protocols such as AH, ESP, and IKE. This IPsec By using the VPN connection we can communicate safely even in the public infrastructure such as the Internet. ◆IPsec works layer Since IPsec operates at the network layer, whether it is TCP or UDP at the […]