// loading
96 short briefings: one for every scenario, one for every track module. Organized by track and level, not by topic alphabet. Each briefing is a one-line orientation on what you will practice, so the terminal scenario does real teaching instead of a cold blind test. Read the briefing, drop into the sandbox, then take the graded assessment.
free to read, no signup; the graded assessment is free with an account · briefings licensed CC BY 4.0
AD accounts, DNS, printer queues, profile caches. The first hour of every helpdesk shift lives here: walk the resolution chain, read the error, fix the cheapest thing first.
Bulk operations, ticket queue triage, MFA edge cases, phishing hand-off. You stop firefighting and start designing the runbook the L1s will follow next week.
MDM rollout, compliance/audit prep, executive escalation, site-wide image refresh. Decisions at this tier affect every laptop in the org for a year.
VLANs, trunking, port states, DHCP scope health. Most outages come from one cable, one config line, one stale ARP entry. Learn to spot which.
OSPF neighbor drama, BGP route policy, MTU/fragmentation, asymmetric paths that break NAT. The work the helpdesk escalates to you at 2am.
IPv6 rollouts, DDoS mitigation, cutover planning, packet capture archaeology. You design changes that survive a typhoon, not just a Monday.
EDR alerts, AD audit logs, email forensics. Most "incidents" are noise : the skill is filtering fast without dismissing real intrusions in the process.
SIEM false-positive tuning, beaconing/C2 detection, cloud posture, Linux priv-esc. You stop reading alerts and start writing the detection logic.
Ransomware containment, WAF change-management, insider-threat investigation, executive write-up. Time pressure + business risk + technical depth, all at once.
IAM policy fits, EC2 health, S3 cost. The 80% of cloud outages caused by 20% of misconfigurations everyone keeps making.
CrashLoopBackOff diagnosis, Terraform state drift, CI/prod skew, AKS upgrades. Where the marketing promise of "self-healing" meets reality.
Region failover, GitOps rollout, cost-attribution, multi-region active/active. You make trade-offs the rest of the team lives with for years.
Disk-full puzzles, systemd journals, cron timing, iptables lockout recovery. The fastest way to look senior is to stop guessing about /proc.
OOM, LVM resize, slow disk diagnosis, SELinux denials, time drift. The bugs that take production down without leaving a clean error message.
Boot rescue, kernel sysctl for high-throughput NICs, memory-image forensics. The lights go out and you bring them back.
Prompt regression after model updates, hallucinations on real customer data, token-cost spikes. The work nobody told you was going to be 60% of the job.
Eval set design, tool-use streaming, PII redaction, open-weights vs hosted trade-offs. The boring infrastructure that lets your demo survive contact with users.
Prompt injection, vector DB drift at scale, end-to-end feature launch. The questions that decide whether your launch lands on the front page for the right or wrong reason.
No videos to sit through, no four-hour courses. Each briefing is one line: enough orientation that the scenario teaches rather than tests you cold. Browse by track and level, read the module briefing, read the scenario briefing, then click into the same sandbox the graded assessment uses.
Disk-full puzzles, systemd journals, cron timing, iptables lockout recovery. The fastest way to look senior is to stop guessing about /proc.
This is not a content dump you have to dig through. When you finish a graded assessment, your results page finds the rubric dimension you scored lowest on and surfaces the lessons in your track that drill that exact dimension. One filter, no vector search, no engagement loop: read the briefing, practice the scenario, retry.
Anyone can submit a short briefing for any of the six tracks. We review every submission; accepted briefings join the library under CC BY 4.0 with your handle credited, and you earn cert credit. Nothing is published without review. Be the first contributor.
library is open, no signup to read, candidates always free