A zero-day crypto-worm is quickly spreading through the internal network on port 25 and exploiting a software vulnerability found within the email servers. Which of the following countermeasures needs to be implemented as soon as possible to mitigate the worm from continuing to spread?

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The exam objectives for the CompTIA CySA+ certification exam includes threat management, cyber incident response, vulnerability, and security architecture and tool sets.. The CompTIA CySA+ exam is meant to be combined with PenTest+ to bridge the gap between the CompTIA Security+ exam, which is more generalized and a step-down, and the CompTIA Advanced Security Practitioner (CASP+), which is the highest-level certification that CompTIA offers within the Cybersecurity pathway.  The CompTIA CySA+ is more affordable, in-depth and hands-on than the CEH. The CEH, however, is more well-known and... Show more

A zero-day crypto-worm is quickly spreading through the internal network on port 25 and exploiting a software vulnerability found within the email servers.<br/> Which of the following countermeasures needs to be implemented as soon as possible to mitigate the worm from continuing to spread?