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Security Incident Response and Operations Questions

Covers the practices, processes, and tooling for responding to security incidents and operating a security capability. Topics include the security incident lifecycle of preparation, detection, analysis, containment, eradication, recovery, and post incident review; development and execution of playbooks and runbooks tailored to threat types; severity classification and decision criteria for escalation; evidence preservation and forensic analysis and chain of custody; crisis communication to stakeholders and regulators; notification and regulatory compliance considerations; and coordination with legal, privacy, communications, and executive leadership. Also includes operational aspects of building and staffing a security operations center, on call schedules and escalation, ticketing and case management, leadership and coordination during major incidents, running blameless post incident reviews to identify systemic improvements, and integration of security incident learnings into engineering and operations.

EasyTechnical
69 practiced
Explain the difference between an Intrusion Detection System (IDS) and an Intrusion Prevention System (IPS). As an SRE, where would you place each in a production stack and what trade-offs do you consider when deciding to block versus alert?
EasyTechnical
59 practiced
Write a Python function that parses web server log lines and returns the top 5 IP addresses by number of failed login attempts within the last 24 hours. Log lines follow this format:\n127.0.0.1 - - [2025-11-22T12:34:56Z] "POST /login" 401 "-" user=alice ip=10.0.0.1\n\nConstraints: process a stream efficiently, deduplicate identical lines, and assume logs may not be sorted by time.
HardSystem Design
80 practiced
Design an enterprise-grade SOC integrated with SRE for a multi-region SaaS platform supporting 200 microservices and 10M security events/day. Define core components (data pipeline, SIEM, SOAR, case management), data retention and indexing strategy, alert-to-analyst ratio targets, integration points with CI/CD and SRE on-call, and staffing model.
HardSystem Design
121 practiced
Design an audit logging architecture that is tamper-evident and searchable at petabyte scale. Include append-only storage options, cryptographic signing or Merkle trees for integrity, indexing strategy for fast queries, retention policy, and access controls for forensic investigations.
HardTechnical
78 practiced
An attacker deleted logs on several hosts. Describe a reconstruction strategy combining multiple telemetry sources (CDN logs, load balancer logs, endpoint telemetry, packet captures, cloud provider logs) to rebuild the attack timeline and demonstrate data exfiltration. Which artifacts are highest trust and why?

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