ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Question
Your e-commerce platform runs two application servers in an active-passive cluster behind a health-checking load balancer. During a resilience test you hard-stop the active node; traffic is quickly redirected but customers are forced to log in again and open carts are lost. Which change would most effectively increase service availability during such failovers?
Enable stateful session replication (or a shared session store) so both nodes maintain identical user sessions in real time.
Move the passive node to a different network segment to add geographic diversity.
Replace the load balancer with round-robin DNS to distribute connections across both servers.
Increase the load balancer's health-check interval to reduce the likelihood of unnecessary failovers.
The disruption occurs because user and transaction state exists only in the memory of the failed node. Enabling stateful session replication (or a shared session store) copies each user's session data to the standby server in real time. When the primary node goes offline, the remaining cluster member already holds current session information, so users continue without interruption. Lengthening health-check intervals would delay detection, round-robin DNS lacks failure awareness, and relocating the passive node improves fault isolation but does not preserve in-memory session state. Only session replication directly eliminates the observed logouts and data loss, thereby enhancing high availability through seamless node takeover.
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ISC2 Certified Secure Software Lifecycle Professional (CSSLP)
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