B. Decommission and replace.
The key word is CRITICAL infrastructure. If you isolate the switch, you would be losing critical infrastructure, which is a worse option than replacing it.
D. Isolate the switch from the network.
The question specifically asks for the "best next step", which means we're looking for an immediate action rather than a long-term strategy.
B. Decommission and replace the switch.
Explanation:
An end-of-support (EOS) device no longer receives security updates, patches, or vendor support. This makes it vulnerable to exploits and security risks, as there will be no fixes for known vulnerabilities.
The most effective and secure approach in this situation is to decommission and replace the outdated switch with a supported model that will continue to receive security updates and patches.
B. Decommission and replace the switch.
End-of-support (EOS) simply means that the vendor will no longer provide updates, patches, or technical support for the switch.
While applying the latest patches is important, it is not sufficient for an EOS switch, as no future updates will be available to address new vulnerabilities. So in this case B is the best answer.
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