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What is the best means to prevent the spread of a network worm that takes advantage of a protocol vulnerability?
Block the protocol traffic between internal network segments.
Install the vendor's security fix for the vulnerability.
Stop the service until an appropriate security fix is installed.
Block the protocol traffic in the perimeter firewall.
Stopping the service and installing the security fix is the safest way to prevent the worm from spreading. If the service is not stopped, installing the fix is not the most effective method because the worm continues spreading until the fix becomes effective. Blocking the protocol on the perimeter does not stop the worm from spreading to the internal network(s). Blocking the protocol helps to slow down the spreading but also prohibits any software that utilizes it from working between segments.
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