Question

In which layer does IPsec work?

Answer 1

IPSec is a suite of protocols that provide security services at IP layer of TCP/IP stack i.e. Network Layer inOSI model. AH provides authentication, integrity and anti-replay services at Network Layer and above.

Answer 2

"IPSec is a suite of protocols that provides security services at IP layer of TCP/ IP stack i.e. Network layer is OSI model . AH provides authentication, integrity and anti-replay services at Network Layer and above."