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Oracle Cloud Infrastructure 2025 Networking Professional Sample Questions (Q78-Q83):

NEW QUESTION # 78
You are designing an OCI VCN for a new application with the following requirements: The application servers in a private subnet must be able to download software updates from public repositories on the internet; the application servers must NOT be directly accessible from the public internet; the application servers must also be able to access Oracle Cloud Infrastructure Registry (OCIR) within the same region to pull container images. Which combination of VCN Gateways BEST meets these requirements?

A. NAT Gateway and Service Gateway
B. NAT Gateway and Internet Gateway
C. Internet Gateway and Service Gateway
D. Dynamic Routing Gateway (DRG) and Internet Gateway

Answer: A

Explanation:
* Requirements: Outbound internet access, no inbound exposure, and private OCIR access.
* Option A: Internet Gateway allows inbound traffic, violating the no-exposure rule-incorrect.
* Option B: NAT Gateway enables outbound-only internet access, but Internet Gateway adds inbound exposure-incorrect.
* Option C: NAT Gateway provides outbound internet access without inbound exposure; Service Gateway enables private OCIR access-correct.
* Option D: DRG is for external networks, not internet/OCIR access; Internet Gateway exposes servers- incorrect.
* Conclusion: Option C satisfies all requirements.
Oracle states:
* "Use a NAT Gateway for outbound internet access from private subnets without inbound connectivity.
Use a Service Gateway for private access to OCI services like OCIR."This supports Option C.
Reference:NAT and Service Gateway Overview - Oracle Help Center(docs.oracle.com/en-us/iaas
/Content/Network/Tasks/NATgateway.htm & docs.oracle.com/en-us/iaas/Content/Network/Tasks
/servicegateway.htm).

NEW QUESTION # 79
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 security list associated with the application server subnet does not allow ingress traffic from the load balancer's IP address range.
B. The Network Address Translation (NAT) Gateway is misconfigured, preventing the application servers from initiating connections back to the load balancer.
C. 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.
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: A

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 # 80
When migrating workloads from AWS to OCI, which connectivity option generally offers the LOWEST latency and HIGHEST bandwidth for data transfer, assuming a direct, dedicated connection is financially viable?

A. Employing AWS Transit Gateway to connect to a VPN Gateway on OCI via a public IP address.
B. Establishing an IPSec VPN tunnel over the public internet between the AWS Virtual Private Cloud (VPC) and the OCI Virtual Cloud Network (VCN).
C. Utilizing a third-party cloud exchange provider to create a private network interconnect between AWS Direct Connect and OCI FastConnect.
D. Leveraging AWS Storage Gateway to replicate data to OCI Object Storage over the internet.

Answer: C

Explanation:
* Goal: Lowest latency, highest bandwidth for AWS-to-OCI migration.
* Option A: IPSec VPN over public internet has variable latency and limited bandwidth-incorrect.
* Option B: Third-party cloud exchange with Direct Connect and FastConnect offers a private, dedicated link, minimizing latency and maximizing bandwidth-correct.
* Option C: Storage Gateway over internet is slow and not dedicated-incorrect.
* Option D: Transit Gateway with VPN uses public internet, lacking performance-incorrect.
* Conclusion: Option B provides the best performance.
Oracle documentation notes:
* "A third-party cloud exchange provider can interconnect AWS Direct Connect and OCI FastConnect, delivering a private, high-bandwidth, low-latency connection."This validates Option B. Reference:
Multicloud Connectivity - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Concepts
/multicloud.htm).

NEW QUESTION # 81
Which OCI service provides detailed logs for network traffic traversing a Network Load Balancer, offering insights into client connections and backend health checks?

A. Load Balancer Logs
B. Audit Logs
C. Flow Logs
D. Service Logs

Answer: A

Explanation:
* Objective: Identify the service for Load Balancer traffic logs.
* Option A: Flow Logs capture VCN traffic, not specific to Load Balancer-incorrect.
* Option B: Service Logs are generic, not Load Balancer-specific-incorrect.
* Option C: Load Balancer Logs provide detailed client and health check data-correct.
* Option D: Audit Logs track API actions, not traffic-incorrect.
* Conclusion: Load Balancer Logs are the best fit.
Oracle states:
* "Load Balancer Logs offer detailed insights into client connections and backend health checks for Network Load Balancers."This validates Option C. Reference:Load Balancer Logging - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Balance/Tasks/managinglogs.htm).

NEW QUESTION # 82
When using Service Connector Hub to route VCN Flow Logs to Object Storage for long-term analysis, which Service Connector Hub task type is essential for ensuring the logs are correctly processed and stored?

A. Process Logs
B. Deliver Logs
C. Ingest Logs
D. Transform Logs

Answer: B

Explanation:
* Objective: Identify the essential Service Connector Hub task for routing Flow Logs to Object Storage.
* Option A (Ingest Logs): Ingesting is for bringing external logs into OCI, but Flow Logs are already OCI-native-incorrect.
* Option B (Process Logs): "Process Logs" isn't a specific task type in Service Connector Hub- incorrect.
* Option C (Deliver Logs): Deliver Logs moves logs to a target (e.g., Object Storage), ensuring storage-correct and essential.
* Option D (Transform Logs): Transforming modifies logs optionally, but delivery is required for storage-incorrect as the primary task.
* Conclusion: Deliver Logs is the essential task type for this scenario.
Oracle documentation states:
* "The Deliver Logs task in Service Connector Hub moves logs, such as VCN Flow Logs, to a specified destination like Object Storage for storage and analysis."This supports Option C. Reference:Service Connector Hub Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content
/ServiceConnectorHub/Concepts/serviceconnectorhub.htm).

NEW QUESTION # 83
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