ISC2 Systems Security Certified Practitioner (SSCP) Practice Question
An organization runs two identical web servers behind a virtual layer-4 load balancer located in the DMZ. Users report that their shopping-cart contents disappear whenever successive HTTP requests are routed to different back-end nodes. To keep individual clients tied to the same server while still sharing the overall workload, which load-balancing technique should the security administrator configure on the device?
Apply weighted round-robin distribution and disable health checks to reduce failovers.
Use a random selection algorithm that treats every incoming request independently.
Switch to a least-connections algorithm without enabling any persistence options.
Configure source-IP hash (source-address affinity) persistence on the load balancer.
Shopping-cart data is stored in the web server's memory for the duration of a user's session. If a subsequent request is sent to a different back-end host, the session state is lost and the cart appears empty. A source-IP hash (also called source-address affinity or consistent hashing) calculates a hash from the client's IP address and always maps that hash to the same real server, providing deterministic stickiness while continuing to distribute different clients across all nodes.
Least-connections, weighted round-robin, and random selection all lack intrinsic session affinity; without additional mechanisms they can direct consecutive requests from the same client to different servers, recreating the problem.
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ISC2 Systems Security Certified Practitioner (SSCP)
Network and Communication Security
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