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CompTIA Security+ · CompTIA
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
When legacy systems are still in production, the most important security concern is that they often rely on outdated or insecure protocols (like FTP, Telnet, SSLv3, or old SMB versions). These protocols are known to have vulnerabilities that attackers can exploit, putting the entire environment at risk.
B. Lack of Vendor Support. The scenario states " Which of the following is the most important security concern when using legacy systems to provide production service?" Keywords: Important security concern, Legacy Systems. The answer "D. insecure protocols" is not the right answer. If a system is using insecure protocols, that can easily be configured. You cannot configure "Lack of Vendor Support" and it is a great security concern because then the system won't get any updates/patches against new vulnerabilities.
with this explanation i think B is more accurate. i initially went for D .