18. Which of the following is the best security reason for closing service ports that are not needed?
Answer: C
Closing service ports that are not needed helps to reduce a system's attack surface.
Reducing a system's attack surface is a crucial security measure as it minimizes the number of potential entry points for attackers. By closing unnecessary service ports, organizations can significantly decrease their vulnerability to various types of cyber threats.
A) To mitigate risks associated with unencrypted traffic
While mitigating risks associated with unencrypted traffic is important, it is not the primary reason for closing unnecessary service ports. This option focuses more on encryption rather than the exposure created by open ports, which can be exploited by attackers.
B) To eliminate false positives from a vulnerability scan
Eliminating false positives from a vulnerability scan is not directly related to the practice of closing service ports. Closing unused ports may help in reducing the overall number of vulnerabilities detected, but this is not a primary security reason for their closure.
C) To reduce a system's attack surface
This is the best reason for closing service ports that are not needed. By limiting the number of open ports, a system presents fewer opportunities for attackers to exploit vulnerabilities, thereby enhancing its overall security posture.
D) To improve a system's resource utilization
Improving resource utilization may occur as a secondary benefit of closing unused service ports, but it is not a primary security reason. Security practices should prioritize the reduction of vulnerabilities and attack vectors over resource management.
Conclusion
Closing unnecessary service ports is essential for reducing a system's attack surface, which is the most effective way to enhance security. Options A, B, and D address different aspects of system management but do not focus on the core security benefit of minimizing potential vulnerabilities through the strategic closure of unused ports.