5.6. Summary

This chapter introduced you to the concept of hardening operating systems, network devices, and applications. To secure a network, each of the elements in its environment must be individually evaluated. Remember, your network is no more secure than its weakest link.

Security baselines provide a standardized method for evaluating the security capabilities of particular products. Never consider an operating system or application to be secured unless it has been certified using the EAL standard, which provides seven levels of certification. Common Criteria has replaced TCSEC as the primary security certification. EAL 4 is the level recommended to provide reasonable security for commercial operating systems.

The number of vulnerabilities ...

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