Linux Fundamentals

Outcome: Navigate Bash confidently using commands, paths, help systems, quoting, variables, expansion, redirection, pipelines, history, and exit status.

Case: A Northbridge technician can copy individual commands but becomes lost when paths contain spaces, a pipeline fails, or output must be redirected without overwriting data.

Tools: Bash command anatomy lab, Quoting and expansion simulator, Pipeline and exit-status worksheet

Outcome: Create, inspect, copy, move, search, compare, archive, and process files and text safely while preserving names, metadata, and intended scope.

Case: A Northbridge content directory contains names with spaces, links, hidden files, mixed encodings, large logs, and duplicate-looking archives. The technician must organize supplied data without losing metadata or scope.

Tools: Safe file-operation lab, Text-processing pipeline, Search-and-compare exercise

Outcome: Explain users, groups, ownership, mode bits, special permissions, ACL awareness, sudo boundaries, authentication files, and least-privilege administration.

Case: A shared Northbridge project directory has inconsistent owners, broad write access, failed collaboration, and an administrator who proposes granting everyone sudo to make the errors disappear.

Tools: Identity-resolution worksheet, Permission calculation lab, Least-privilege access design

Outcome: Inspect processes, jobs, signals, resource use, environment, procfs, startup context, and failures without disrupting unrelated workloads.

Case: A Northbridge VM is slow. One process is consuming CPU, a shell job is stopped, and a service child keeps returning. The technician wants to terminate anything unfamiliar.

Tools: Process-tree exercise, Signal decision lab, Resource triage worksheet

Outcome: Compare Debian and RPM package ecosystems and perform planned repository, package, dependency, update, verification, rollback, and change-record tasks in a lab.

Case: A Northbridge lab needs a text utility update. The technician mixes apt, dpkg, dnf, and downloaded scripts, cannot explain repository trust, and has no rollback record.

Tools: Package-family comparison, Transaction planning lab, Update and rollback record

Outcome: Inspect and safely operate systemd units, logs, boot context, timers, configuration overrides, failure diagnosis, and controlled service changes.

Case: A Northbridge training service fails after a configuration edit. It is enabled but inactive, its timer did not run, and the technician has been reading only one text log.

Tools: Unit-state lab, Journal query exercise, Service recovery runbook

Outcome: Explain devices, partitions, filesystems, mounts, capacity, inodes, links, archives, backup, restore, and storage-change safeguards.

Case: A Northbridge VM reports low space and an unmounted training volume. The technician proposes deleting logs, editing /etc/fstab, and reformatting a device without confirming identifiers or backups.

Tools: Storage inventory, Mount-plan worksheet, Backup-and-restore lab

Outcome: Inspect Linux networking, name resolution, sockets, routes, SSH trust, keys, file transfer, and firewall concepts within an authorized isolated lab.

Case: A Northbridge lab host cannot reach a training service. DNS, route, listener, SSH host trust, and firewall evidence point in different directions, and the technician wants to disable every firewall rule.

Tools: Network-layer triage, SSH trust lab, Firewall change simulation

Outcome: Integrate Linux administration, hardening, troubleshooting, documentation, recovery, and verification in a safe Northbridge server capstone.

Case: A synthetic Northbridge training server has an expired package, failed service, broad project permissions, an unexpected listener, low log capacity, and a weak recovery record. Operations need a safe, documented repair.

Tools: Baseline and hardening checklist, Troubleshooting evidence pack, Northbridge Linux capstone