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OCI 1Z0-1124-25 Sample Questions with Explanations

April 26, 2026

OCI 1Z0-1124-25 sample questions with explanations, traps, topic labels, and IT Mastery route links.

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These original sample questions are designed to help you check how the exam topics appear in decision-style prompts. They are not taken from the live exam.

Use these sample questions as a guided self-assessment for OCI Networking Professional (1Z0-1124-25) topics such as VCN design, subnets, route tables, gateways, DRG, VPN, FastConnect, NSGs, security lists, DNS, load balancing, and troubleshooting order. The prompts focus on path selection and traffic-control placement.

Where these questions fit in the 1Z0-1124-25 guide

The sample set below is part of the Oracle OCI 1Z0-1124-25 guide path:

1Z0-1124-25 OCI Networking sample questions

Work through each prompt before opening the explanation. Networking questions usually reward proving the path first, then checking filtering, DNS, gateway or attachment state, and load-balancer health.

Question 1

Topic: Route versus filter troubleshooting

An instance in a private subnet cannot reach a database in another subnet. DNS resolves to the expected private address. What is the best troubleshooting order?

  • A. Rebuild the instance before checking network controls.
  • B. Verify the route path, then security rules such as NSGs or security lists, then gateway or attachment state if applicable.
  • C. Change the database password because all connectivity failures are authentication failures.
  • D. Add a public IP address to the database to bypass private networking.

Best answer: B

Explanation: Network troubleshooting should prove path and filtering before changing unrelated layers. Route tables decide where traffic goes, while NSGs or security lists decide whether traffic is allowed.

Why the other choices are weaker:

  • A changes compute before proving the network path.
  • C jumps to application authentication without evidence.
  • D weakens the design and bypasses the private path requirement.

What this tests: Route tables, filtering controls, DNS confirmation, and troubleshooting order.

Related topics: Route tables; NSGs; Security lists; DNS; Troubleshooting

Question 2

Topic: Private Oracle service access

Resources in a private subnet need to access supported Oracle services without public internet exposure. Which gateway is the best fit?

  • A. Internet Gateway.
  • B. Dynamic Routing Gateway only.
  • C. Local Peering Gateway.
  • D. Service Gateway.

Best answer: D

Explanation: A Service Gateway provides private access from a VCN to supported Oracle services. It is the strongest answer when the requirement is Oracle service access without public internet exposure.

Why the other choices are weaker:

  • A is for public internet paths.
  • B supports private routing attachments such as on-premises or other networks, but it is not the direct Oracle services path.
  • C is for VCN peering in a region, not Oracle services access.

What this tests: Gateway selection and distinguishing Oracle service access from internet, peering, and hybrid routes.

Related topics: Service Gateway; VCN; Oracle services; Private subnets; Routing

Question 3

Topic: DRG hub design

Several VCNs and an on-premises network need controlled private connectivity. Routes must be centrally managed so not every network can reach every other network by default. Which design is strongest?

  • A. Use a DRG-centered design with explicit attachments, route tables, and allowed routing paths.
  • B. Assign public IP addresses to all private workloads and rely on host firewalls.
  • C. Create unmanaged ad hoc peerings between every network pair.
  • D. Put all resources in one flat subnet to avoid routing decisions.

Best answer: A

Explanation: DRG-centered routing supports private connectivity and route-table control across attachments. Explicit route design keeps reachability intentional instead of creating uncontrolled full-mesh access.

Why the other choices are weaker:

  • B increases public exposure.
  • C becomes difficult to govern and troubleshoot.
  • D collapses segmentation and increases blast radius.

What this tests: DRG attachments, centralized routing, segmentation, and private network architecture.

Related topics: DRG; VCN; Route tables; Hybrid connectivity; Segmentation

Question 4

Topic: DNS and private endpoints

An application should connect to a private endpoint, but logs show it is resolving the public service name and attempting a public path. What should the network engineer check?

  • A. The instance shape size only.
  • B. Whether the database backup schedule is enabled.
  • C. DNS view, resolver, private zone, or endpoint name configuration so resolution matches the intended private route.
  • D. Whether users have browser bookmarks to the application.

Best answer: C

Explanation: The symptom points to name resolution not matching the intended private path. DNS views, resolver configuration, private zones, or endpoint names should be checked so the application resolves the private target.

Why the other choices are weaker:

  • A is unrelated to DNS resolution.
  • B affects recovery, not name-to-address selection.
  • D is not the application’s service resolution path.

What this tests: DNS troubleshooting, private resolution, endpoint naming, and matching DNS to routing design.

Related topics: DNS; Private endpoints; Resolver; Private zones; Routing

Independent study note

Tech Exam Lexicon and IT Mastery are independent study tools. They are not affiliated with, endorsed by, or sponsored by Oracle or any certification body.

Revised on Sunday, May 10, 2026
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