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1Z0-1124-25 Cheatsheet — OCI Networking (VCN, DRG, Routing, Security)

Last-mile 1Z0-1124-25 review: VCN and subnet patterns, DRG hub-and-spoke pickers, routing table reminders, and security list vs NSG decision tables.

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

1) Gateway picker (high-yield)

You need… Prefer
Public internet ingress/egress Internet Gateway (IGW)
Private subnet outbound only NAT Gateway
Private access to Oracle services Service Gateway
On-prem and cross-VCN routing hub DRG

2) Security Lists vs NSGs

You need… Prefer
Simple subnet-wide controls Security lists
Granular, workload-level controls NSGs

Correct answers usually include least privilege NSGs for app tiers.

3) Connectivity picker

Requirement Prefer
Fast setup / lower cost IPSec VPN
Higher bandwidth / predictable latency FastConnect
Many VCNs / centralized routing DRG hub-spoke

4) Troubleshooting workflow (network issues)

  1. Verify routes (route tables + DRG attachments).
  2. Verify security (NSGs + security lists).
  3. Verify DNS resolution and target IPs.
  4. Verify gateways (IGW/NAT/Service GW) and egress rules.
Syllabus
Practice