NCJOSI study materials
NCJOSI study resources

NCJOSI case studies

NCJOSI · Put your knowledge to work in context.

NCJOSI is a vendor-neutral, multiple-choice certification aimed at practitioners who need a working, cross-domain command of defensive security rather than deep specialization in one tool. It suits SOC analysts, junior security engineers, IT administrators moving into security, and compliance or risk staff who must speak credibly with technical teams. The blueprint is deliberately broad: network security fundamentals, the threat landscape and attack vectors, security operations and monitoring, incident response and forensics, vulnerability management and risk assessment, cryptography and data protection, identity and access management, and policy, compliance, and governance. Each domain carries modest weight, so the exam rewards balanced coverage; a candidate who is strong in monitoring but weak in governance or cryptography will feel that gap in the score. The NCJOSI case studies are 5 cases and about 3,884 words.

1

Periodic HTTPS from an OT Jump Host: Beacon or Vendor Agent?

Northbridge Manufacturing runs 1,200 endpoints with a segmented OT zone (VLAN 40) containing 60 Windows HMI and jump hosts. Egress from VLAN 40 is default-deny; only an allowlist of vendor update endpoints is permitted.

801 words, about 4 min
2

Ransomware on the Finance File Server: Restore, Rebuild, or Pay?

At 08:12 on Monday the service desk receives 14 tickets in six minutes: files on FS01 will not open. FS01 is a Windows Server 2019 file server holding 2 TB across 340,000 files, including the finance share.

765 words, about 4 min
3

Three Simultaneous Findings, Two Change Slots

A retail bank's vulnerability program uses 30/90/180-day remediation SLAs by severity. This week's scan produces three findings on the same day.

765 words, about 4 min
4

MFA Fatigue Followed by a Helpdesk Reset

Contoso Health has 4,000 staff on Microsoft Entra ID with per-user MFA. On Thursday at 22:10 a clinician's account receives 63 push notifications in 19 minutes.

722 words, about 4 min
5

Post-Acquisition Encryption Inventory with Departing Key Holders

After acquiring a 60-person logistics firm, the security team inventories its encryption. The customer portal supports TLS 1.0 and TLS 1.2 with CBC cipher suites, using a certificate from an internal CA whose root was created in 2014 with SHA-1 and is trusted by all 400 employee laptops.

831 words, about 4 min