ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Question
Your team is refactoring a monolithic payment application into small containerized microservices deployed in separate subnets across two cloud regions. From a defense in depth perspective, which benefit of this distributed design most directly reduces risk if the checkout microservice is breached?
Horizontal auto-scaling lets the platform absorb sudden spikes in legitimate or malicious traffic without manual action.
Internal traffic can stay unencrypted, eliminating the overhead of TLS inside the cluster.
Blue/green deployments guarantee uninterrupted availability during version rollouts.
Isolation of each function limits lateral movement through service-level identities and network policies.
Breaking a monolith into independently deployed microservices allows each component to run with its own identity, network segment, and access policies. When one service is compromised, those boundaries limit an attacker's ability to pivot to other data or functions, thereby shrinking the blast radius and adding another layer to the overall security stack. The other choices describe useful operational characteristics-unencrypted internal traffic, blue/green deployments, and auto-scaling-but they do not directly provide an additional security layer that contains a successful attack.
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What does 'defense in depth' mean in cybersecurity?
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ISC2 Certified Secure Software Lifecycle Professional (CSSLP)
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