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Multi Node & Extension objects

In a multi node (2 Node) environment, if you have a network load balancer, my understanding is it will direct you to one of the Sense nodes.  If I have 2 identical nodes (Fail over) and the central node goes down, I should be directed to the 2nd node.  Is this correct so far?  Also, I have installed extensions on the central node and node 2, however if the central node is down I am not able to use the extensions on Node 2 and I am getting this error,

Failed to load resource: the server responded with a status of 404 (Cannot establish a connection to Qlik Sense: Qlik Sense Repository REST API).

Is this the expected behavior or should my extension work on Node 2 without the Central node being active?