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1Z0-1085-25 Cheatsheet — OCI Foundations (Tenancy, IAM, Networking, Core Services)

Last-mile 1Z0-1085-25 review: OCI tenancy model, IAM basics, VCN networking basics, compute/storage pickers, observability, and governance/pricing.

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Use this for last‑mile review. Pair it with the Syllabus for coverage.

1) OCI in one picture (tenancy → compartments → resources)

    flowchart TD
	  T["Tenancy"] --> C1["Compartment: Prod"]
	  T --> C2["Compartment: Dev"]
	  C1 --> P1["Policies"]
	  C1 --> R1["Resources (VCN, Compute, DB, ...)"]
	  C2 --> P2["Policies"]
	  C2 --> R2["Resources"]

Rule: Compartments are logical isolation for access + governance; they are not “network boundaries”.

2) Core OCI vocabulary (high-yield)

Term What it is What to remember
Tenancy your OCI account boundary top-level for identity + billing
Compartment logical container used in policies, tagging, budgets
Region geographic area contains availability domains
AD / FD failure isolation use for HA within a region
VCN virtual network subnets, route tables, security

3) IAM basics (what the exam keeps testing)

Identity primitives

You need… Use…
Human access Users + Groups + Policies
Resource-to-resource access Dynamic Groups + Policies

Policy mental model

Policy language is human-readable. Typical pattern:

1Allow group <group-name> to manage <resource-family> in compartment <compartment-name>

Exam cues

  • Prefer least privilege (manage vs use vs read).
  • Always scope to the right compartment.

4) Networking basics (VCN pickers)

Concept Exam-friendly rule
Security Lists subnet-level, stateful by default
NSGs attach to VNIC/resources, more granular
Route table where traffic goes (IGW/NAT/SGW/DRG)
Internet Gateway (IGW) public internet ingress/egress
NAT Gateway private subnet outbound only
Service Gateway private access to Oracle services without internet

5) Compute + storage quick selection

Storage types

Requirement Prefer
Durable object store, backups, logs Object Storage
Attach volumes to compute Block Volumes
Shared POSIX-style filesystem File Storage
Lowest cost archival Archive Storage

Compute types (concept level)

Requirement Prefer
General VM workloads Compute VM instances
Dedicated performance / special needs Bare metal / specialized shapes
Managed containers OKE (Kubernetes)

6) Observability & governance (remember these)

  • Monitoring + Alarms: metrics → thresholds → notifications.
  • Logging: centralize logs for services and apps.
  • Audit: record API calls for compliance and investigations.
  • Tagging + Budgets: cost visibility and guardrails.
Syllabus
Practice