A site has assigned the ICMP monitor to all nodes and a custom monitor, based on the HTTP template, to a pool of web servers. The HTTP based monitor is working in all cases. The ICMP monitor is…

This is incorrect because all assigned monitors must pass for a pool member to be considered up. The success of the HTTP monitor does not negate the failure of the ICMP monitor.

This is incorrect as only the specific pool members failing the ICMP monitor will be marked down, not all pool members. Other pool members that pass all checks remain up.

This is incorrect because 'disabled' usually implies a manual administrative action or a specific state where a member is gracefully taken out of service, not an automatic response to a monitor failure. Monitor failures result in a 'down' or 'unavailable' status.

In BIG-IP, if a pool member fails an assigned health monitor, it is marked as 'unavailable' or 'down' by default, meaning it will no longer receive new connections from the virtual server. Even if another monitor (like the HTTP monitor) is passing, the failure of the ICMP monitor for specific nodes renders those pool members non-operational.