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Oracle Cloud Infrastructure 2025 Networking Professional Sample Questions (Q30-Q35):

NEW QUESTION # 30
You are designing a multi-tier application in OCI, deploying the application tier in a public subnet and the database tier in a private subnet within the same VCN. The application tier requires access to specific external internet resources for software updates and third-party API calls. However, the database tier should not have direct internet access. Which of the following is the most secure and efficient method to achieve this configuration?

A. Configure a NAT Gateway for the public subnet and a Service Gateway for the private subnet.
B. Configure a NAT Gateway for both the public and private subnets.
C. Configure a NAT Gateway for the private subnet and an Internet Gateway for the public subnet.
D. Configure a NAT Gateway for the private subnet and a Service Gateway for the public subnet.

Answer: C

Explanation:
* Requirements:App tier (public) needs internet; DB tier (private) must not.
* Components:
* Internet Gateway:Full internet access for public subnets.
* NAT Gateway:Outbound-only internet for private subnets.
* Service Gateway:Private OCI service access.
* Evaluate Options:
* A:Reversed roles; public subnet doesn't need Service Gateway; incorrect.
* B:NAT for public is unnecessary with Internet Gateway; inefficient.
* C:NAT for public is wrong; Service Gateway doesn't block DB internet; incorrect.
* D:Internet Gateway for app, NAT for DB if needed, aligns with policy; correct.
* Conclusion:Option D is most secure and efficient.
Subnet roles dictate gateway use. The Oracle Networking Professional study guide states, "Public subnets use an Internet Gateway for full internet access, while private subnets can use a NAT Gateway for outbound-only access, ensuring no direct internet exposure" (OCI Networking Documentation, Section: VCN Gateways).
Option D balances security and functionality.

NEW QUESTION # 31
You are designing an OCI networking architecture for a multi-tier application using Infrastructure as Code (IaC). The architecture includes an OKE cluster for the front-end, a set of Compute instances for the back- end, and an Autonomous Database. You want to ensure that all traffic between these components is encrypted. You are using Transport Layer Security (TLS) for end-to-end encryption but are concerned about the overhead of encrypting all traffic within the VCN. Which approach provides the MOST balanced approach to security and performance, minimizing the overhead of encryption while still protecting sensitive data?

A. Implement TLS encryption for traffic between the OKE cluster and the Compute instances and use Oracle Database Vault to encrypt data at rest and in transit for the Autonomous Database.
B. Use Network Security Groups (NSGs) and Security Lists to control access between components but do not implement any additional encryption within the VCN.
C. Implement TLS encryption only between the OKE cluster and the load balancer. Rely on the inherent security of the OCI network for traffic within the VCN.
D. Implement mutual TLS (mTLS) for all traffic between the OKE cluster, the Compute instances, and the Autonomous Database.

Answer: A

Explanation:
* Goal: Balance security and performance with encryption in a VCN.
* Option A: TLS only to the load balancer leaves internal traffic unencrypted, risking exposure- insufficient security.
* Option B: mTLS everywhere maximizes security but adds significant overhead (e.g., certificate management), impacting performance-overkill.
* Option C: NSGs/Security Lists control access but don't encrypt traffic-lacks protection for sensitive data.
* Option D: TLS between OKE and Compute secures app-tier communication. Oracle Database Vault ensures ADB traffic is encrypted efficiently, leveraging built-in features-balanced approach.
* Conclusion: Option D optimizes security and performance.
Oracle states:
* "Use TLS for application traffic between tiers. Autonomous Database with Database Vaultprovides encryption in transit and at rest, minimizing overhead."This supports Option D. Reference:Security in OCI Networking - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Concepts
/securityoverview.htm).

NEW QUESTION # 32
In a multi-region OCI environment, which configuration is necessary to allow communication between two VCNs located in different regions through a DRG?

A. Configuring Internet Gateways on each VCN and using public IP addresses for communication.
B. Attaching each VCN to the same DRG and configuring the appropriate route tables on the DRG.
C. Attaching a Service Gateway to each VCN and enabling transitive routing.
D. Attaching an LPG to each VCN and configuring route tables to peer them directly.

Answer: B

Explanation:
* Requirement: Private communication between VCNs in different OCI regions via DRG.
* Option A: LPGs are for same-region VCN peering, not cross-region-incorrect.
* Option B: Service Gateways are for OCI service access, not VCN-to-VCN routing-incorrect.
* Option C: Attaching both VCNs to a single DRG (via Remote Peering Connections implicitly) and configuring route tables enables cross-region communication over OCI's backbone. This is the standard approach.
* Option D: Internet Gateways use public IPs, which is insecure and not private-incorrect.
* Conclusion: Option C is the necessary configuration for DRG-based cross-region connectivity.
Oracle documentation confirms:
* "To connect VCNs in different regions, attach each to a DRG using Remote Peering Connections (RPCs). Configure DRG route tables to route traffic between VCN CIDRs."Option C reflects this setup (RPCs are implied). Reference:VCN Peering Overview - Oracle Help Center(docs.oracle.com/en-us/iaas
/Content/Network/Tasks/remoteVCNpeering.htm).

NEW QUESTION # 33
You are using Terraform to deploy a multi-tier application architecture consisting of a public subnet hosting a load balancer, a private subnet hosting application servers, and another private subnet hosting a database. The Terraform code successfully creates all the required infrastructure, including route tables and security lists.
However, after deployment, you realize that the load balancer cannot reach the application servers in the private subnet. You have verified that the load balancer is healthy and the application servers are running.
What is the most likely cause of this connectivity problem?

A. The Network Address Translation (NAT) Gateway is misconfigured, preventing the application servers from initiating connections back to the load balancer.
B. The route table associated with the application server subnet has a default route pointing to the Internet Gateway, which is incorrect for a private subnet.
C. The security list associated with the application server subnet does not allow ingress traffic from the load balancer's IP address range.
D. The load balancer's security list is not configured to allow egress traffic to the application server subnet on the required ports (e.g., port 8080).

Answer: C

Explanation:
* Problem Scope:Load balancer (public subnet) cannot reach application servers (private subnet).
* Connectivity Flow:Load balancer initiates traffic to application servers; application servers respond.
Key checkpoints: routing and security rules.
* Analyze Routing:Private subnets typically don't route to an Internet Gateway by default; they use NAT or Service Gateways. Misrouting (Option B) would affect outbound traffic, not inbound from the load balancer.
* Security Rules:
* Ingress (App Servers):Must allow traffic from the load balancer's IP range.
* Egress (Load Balancer):Must allow traffic to the application servers.
* Evaluate Options:
* A:Missing ingress rule on application servers' security list blocks load balancer traffic; most likely.
* B:Incorrect default route affects outbound, not inbound; less likely.
* C:NAT misconfiguration impacts outbound, not inbound; incorrect.
* D:Load balancer egress is necessary but secondary to application server ingress.
* Conclusion:Ingress rule absence on the application server subnet is the primary blocker.
Security lists control traffic at the subnet level in OCI. The Oracle Networking Professional study guide explains, "For a load balancer in a public subnet to communicate with instances in a private subnet, the private subnet's security list must include an ingress rule allowing traffic from the load balancer's IP range" (OCI Networking Documentation, Section: Security Lists). Since Terraform deployed the infrastructure, a misconfigured security list is a common oversight.

NEW QUESTION # 34
Which OCI service or feature enables the enforcement of granular, identity-based access controls for packet routing, crucial for implementing Zero Trust principles?

A. Service Gateway
B. Dynamic Routing Gateway (DRG)
C. Internet Gateway
D. Network Security Groups (NSGs)

Answer: D

Explanation:
* Zero Trust Principles:Require explicit, identity-based access controls at every network stage.
* Evaluate OCI Services:
* Internet Gateway:Enables public internet access, no identity-based control.
* Service Gateway:Provides private service access, no granular routing control.
* NSGs:Offer stateful, identity-based rules at the VNIC level.
* DRG:Facilitates routing, not identity-based access control.
* NSG Fit:NSGs allow rules based on VNIC identity, source/destination IP, and ports, aligning with Zero Trust.
* Conclusion:NSGs are the best fit for granular, identity-based routing control.
NSGs are pivotal for Zero Trust in OCI. The Oracle Networking Professional study guide states, "Network Security Groups provide granular, stateful security rules that can be applied to specific VNICs, enabling identity-based access controls essential for Zero Trust architectures" (OCI Networking Documentation, Section: Network Security Groups). Unlike security lists (subnet-level), NSGs offer instance-level precision.

NEW QUESTION # 35
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Oracle 1z0-1124-25 Questions Tips To Pass Exam [2025]

1z0-1124-25 Reliable Test Review: 2025 Oracle Realistic Oracle Cloud Infrastructure 2025 Networking Professional Reliable Test Review Pass Guaranteed Quiz

Oracle Cloud Infrastructure 2025 Networking Professional Sample Questions (Q30-Q35):

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