Certified Network Defender v3 (CND) — Lesson 3: Monitoring, IDS/IPS, Logs, Detection, Investigation, and Threat Hunting

Learning Objectives

• Explain the structures, services, data, settings, roles, and dependencies governing Network Telemetry and Ids/Ips.
• Implement and validate Log Analysis, Detection Logic, and Investigation and Threat Hunting using reviewable evidence.
• Evaluate the condition where analysts reach the wrong conclusion because Investigation and Threat Hunting evidence is incomplete and Ids/Ips context was not preserved and select a proportionate corrective response.

Detailed Topics

• Network Telemetry applied to the course scenario, expected behavior, dependencies, controls, and evidence.
• Ids/Ips applied to the course scenario, expected behavior, dependencies, controls, and evidence.
• Log Analysis applied to the course scenario, expected behavior, dependencies, controls, and evidence.
• Detection Logic applied to the course scenario, expected behavior, dependencies, controls, and evidence.
• Investigation and Threat Hunting applied to the course scenario, expected behavior, dependencies, controls, and evidence.

Instructor Demonstration

The instructor traces a network defense team must protect hybrid connectivity, identify abnormal traffic, validate controls, and maintain service availability during response. The walkthrough connects tools, configuration or analysis logic, system messages, decisions, and evidence captured in the network-defense architecture, hardening checklist, monitoring cases, and response runbook. It also tests the exception where analysts reach the wrong conclusion because Investigation and Threat Hunting evidence is incomplete and Ids/Ips context was not preserved.

Hands-On Exercise

Complete a controlled, authorized EC-Council exercise covering Monitoring, IDS/IPS, Logs, Detection, Investigation, and Threat Hunting and preserve the verified result in the network-defense architecture, hardening checklist, monitoring cases, and response runbook.

1. Confirm scope, authorization, prerequisites, versions, identities, dependencies, and acceptance criteria.
2. Execute the workflow while recording settings, outputs, events, decisions, and system messages.
3. Test normal behavior, one boundary condition, and the stated exception without targeting real third-party systems.
4. Document corrections, evidence, ownership, retest criteria, rollback or recovery, and handover actions.

Scenario Analysis

• Identify which object, service, policy, setting, or sequence most strongly influences Network Telemetry.
• Compare two defensible responses and explain technical, security, operational, legal, and support trade-offs.
• Determine how the network-defense architecture, hardening checklist, monitoring cases, and response runbook should be approved, retained, retested, and updated.

Troubleshooting Guidance

Start where expected behavior first differs from the observed result. Check authorization, prerequisites, identity, configuration order, data quality, version compatibility, connectivity, status, resource limits, and evidence separately. Treat “analysts reach the wrong conclusion because Investigation and Threat Hunting evidence is incomplete and Ids/Ips context was not preserved” as a hypothesis until logs, settings, captured outputs, and retest outcomes confirm the cause.

Validation Checklist

• Required components, identities, permissions, settings, safety controls, and dependencies are present.
• The network-defense architecture, hardening checklist, monitoring cases, and response runbook connects each conclusion to objective, reviewable evidence.
• Normal processing, a boundary condition, dependency behavior, and the stated exception were tested.
• Corrections, ownership, retest criteria, rollback or recovery, documentation, and operational handover are complete.

Lesson Outcome

Learners can apply Monitoring, IDS/IPS, Logs, Detection, Investigation, and Threat Hunting, explain the resulting security or operational behavior, and defend the outcome through the network-defense architecture, hardening checklist, monitoring cases, and response runbook.