5. Conclusion

Meeting security requirements does not mean that you can be 100% sure that the security objectives you have set yourself will be achieved. It only means that you are in control of your security: you detect attacks within a "reasonable" time, you check your procedures regularly and are able to identify any flaws, you learn from security incidents, you log access to network services, etc. In a nutshell: you manage your security. In a nutshell: you manage your security.