STAGE 1: Map the network
Concept: Addresses, routes and names solve different problems.
Task: Draw devices, subnets, gateways and the DNS role.
Acceptance: Label the diagram as a fictional lab and avoid real infrastructure details.

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STAGE 2: Plan addressing
Concept: A subnet plan should prevent overlap and clarify membership.
Task: Assign sample addresses within the supplied private lab ranges.
Acceptance: Every device’s gateway belongs to its local subnet.

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STAGE 3: Trace the path
Concept: Troubleshooting should separate local, routing and application failures.
Task: Create a test plan for a host that reaches its gateway but not a remote subnet.
Acceptance: Record evidence before changing route configuration.

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STAGE 4: Document and hand over
Concept: A network change needs a before/after record.
Task: Write a proposed correction, rollback and validation checklist.
Acceptance: Do not scan or change a network without explicit ownership and permission.

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