Zero Trust, Segmentation, and Service-to-Service Security Questions
Designing network and service-communication trust models where no implicit trust is granted by network location. Covers zero-trust access, microsegmentation and identity-aware perimeters, least-privilege network access, lateral-movement prevention, and segmenting environments to contain blast radius, together with securing service-to-service communication in distributed and microservices architectures: mutual authentication between services, service mesh security, multi-tenancy isolation, east-west traffic, and the security implications of scale and geographic distribution. The architectural trust-boundary pattern and its enforcement across decomposed, high-scale systems, distinct from device-level firewall configuration.
Design an architecture for continuous authentication and authorization (risk-based access) that ingests contextual signals such as device posture, network location, user behavior, and time of day. Explain how to compute a risk score, where to evaluate policies (edge, gateway, PDP), and how to balance false positives with security needs.
List and define measurable KPIs and telemetry metrics you would use to evaluate the effectiveness of a Zero Trust deployment over time. Include both security-oriented metrics (e.g., detection rate of lateral movement, mean time to revoke compromised credentials) and adoption/operational metrics (e.g., percentage of internal traffic encrypted, number of policies created vs retired). Explain why each metric is useful.
Describe how to secure API gateways within a Zero Trust architecture. Cover authentication (token validation), authorization (scopes/claims and PDP integration), input validation, rate limiting, telemetry generation to SIEM, and secure headers. Provide a recommended enforcement flow from ingress to backend service.
Describe the purpose of a bastion host (jump box) for administrative access. List at least five hardening and operational controls you would enforce on a bastion (e.g., MFA, session recording). Explain integration points with identity providers and ephemeral credential workflows.
Define network segmentation and trust boundaries in the context of enterprise security architecture. Explain at least three concrete security benefits (for example: limiting lateral movement, reducing blast radius, improving monitoring fidelity) and one operational or organizational challenge companies commonly face when implementing segmentation at scale.
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