explain each one briefly please:

1. IPSec in VPN

2. IPSec in lower level network management (such as routing)

3. IPSec offers protection of sensitive data in a protected network environment such as the internet, thus to say it enhances information security and privacy

4. It also provides end to end reliable service for network communications

5. IPSec in encryption in some instances if a man in the middle attack happens the data cannot be decrypted