Proper networking access for vulnerability scanning

​Devices such as firewalls may prevent access to systems running various applications. For example a firewall may only allow mail delivery to mail server, however that mail server may also run web server software that is not available from outside.

Internal security scan will uncover that.

So both external and internal security scans are important to be performed. External scan will indicate what vulnerabilities exist in publicly accessible services and it may indicate issues with configuration.

Internal security scans have more access than external scans and they will indicate a larger number of problems.

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