NCP-GENL case studies
NCP-GENL · Put your knowledge to work in context.
NCP-GENL is a generalist networking and Linux systems credential aimed at candidates who need to demonstrate practical competence across the full stack of day-to-day infrastructure work rather than deep specialization in one area. It suits junior administrators, support engineers moving into systems roles, and developers who are expected to operate their own infrastructure. The exam is multiple choice and is organized into six weighted domains: installation and configuration (20%), networking fundamentals (20%), storage and file systems (15%), security and access control (15%), monitoring and troubleshooting (15%), and automation and scripting (15%). Questions test applied reasoning - reading a configuration, predicting the effect of a command, or choosing the correct diagnostic step - rather than trivia recall, so hands-on practice matters more than memorizing flags. The NCP-GENL case studies are 5 cases and about 3,834 words.
1UEFI Secure Boot Stops Half the Nightly Reimage
A fleet of 240 build nodes is reimaged nightly from one PXE server in a four-hour window. The 180 older nodes use legacy BIOS and image without issue.
590 words, about 3 min2Jumbo Frames and a Silent Path MTU Black Hole
Two data centres are linked by a 10 GbE routed path. Storage hosts on VLAN 40 use jumbo frames: mtu 9000 on both NICs and on both access switches.
820 words, about 4 min3Thin Pool at 96% While the Guest Says 55%
An 8 TB LVM thin pool backs six application volumes on a KVM host. vgdisplay shows 1.0 TB unallocated in the volume group.
825 words, about 4 min4sudo Works Interactively but Fails Inside the Hardened CI Unit
On Ubuntu 22.04, the release team's CI agent runs as the deploy user inside a systemd service ( ci-agent.service ) on a shared build host. Administrators added /etc/sudoers.d/90-deploy containing deploy ALL=(root) NOPASSWD: /usr/bin/systemctl restart myapp and validated it with visudo -cf .
765 words, about 4 min5Alert Storm and Impossible rate() After a Clock Step
A Prometheus server (15 s scrape interval, 30-day retention) monitors 300 nodes and 40 exporters. It runs as a VM on shared storage and was restored from a snapshot during an incident.
834 words, about 4 min