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Oracle Cloud Infrastructure 2025 Networking Professional Sample Questions (Q77-Q82):

NEW QUESTION # 77
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 private subnet and an Internet Gateway for the public subnet.
B. Configure a NAT Gateway for the public subnet and a Service Gateway for the private subnet.
C. Configure a NAT Gateway for both the public and private subnets.
D. Configure a NAT Gateway for the private subnet and a Service Gateway for the public subnet.

Answer: A

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 # 78
Which OCI resource is used to establish private connectivity between two VCNs within the same region, facilitating direct, low-latency communication?

A. Local Peering Gateway (LPG)
B. Service Gateway
C. Internet Gateway
D. Dynamic Routing Gateway (DRG)

Answer: A

Explanation:
* Objective: Identify the OCI resource for private, low-latency VCN-to-VCN connectivity in the same region.
* Option A: DRG connects VCNs to external networks (e.g., on-premises) or across regions, not for same-region peering-incorrect.
* Option B: LPG is designed for private peering of VCNs within the same region, ensuring low-latency communication-correct.
* Option C: Internet Gateway provides public internet access, not private connectivity-incorrect.
* Option D: Service Gateway connects VCNs to OCI services, not other VCNs-incorrect.
* Conclusion: Option B is the appropriate resource.
Oracle documentation states:
* "A Local Peering Gateway (LPG) enables private connectivity between two VCNs in the same region, providing direct, low-latency communication."This confirms Option B. Reference:Local VCN Peering Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/localVCNpeering.
htm).

NEW QUESTION # 79
Which OCI service provides detailed logs for network traffic traversing a Network Load Balancer, offering insights into client connections and backend health checks?

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

Answer: D

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 # 80
You are deploying a three-tier web application using Infrastructure as Code (IaC) and Oracle Kubernetes Engine (OKE) within a single VCN. The application consists of a public-facing web tier (running in OKE), an application tier, and a database tier. You want to ensure that only the web tier can access the application tier, and only the application tier can access the database tier. You are leveraging Network Security Groups (NSGs) for granular access control. Your IaC code successfully creates all the components, but you are experiencing connectivity issues. Specifically, Pods in the web tier cannot reach the application tier.
Reviewing your IaC configuration, you realize the NSG assignments for the OKE cluster's node pool are misconfigured. Which of the following NSG configuration errors would most likely cause this connectivity issue?

A. The NSG associated with the application tier allows ingress traffic from the VCN CIDR, but the NSG associated with the OKE node pool (web tier) has no ingress rules at all. Therefore, the OKE nodes are not reachable.
B. The NSG associated with the OKE node pool (web tier) is missing an ingress rule allowing traffic from the VCN CIDR on port 443. This is causing a routing problem within the VCN.
C. The NSG associated with the OKE node pool (web tier) only allows egress traffic to the internet and does not have a rule permitting egress traffic to the application tier's NSG on the required port (8080).
D. The NSG associated with the OKE node pool (web tier) allows ingress traffic from 0.0.0.0/0 on port 80, but egress traffic to the application tier's NSG is missing a rule allowing TCP traffic on port 8080 (the port the application tier is listening on).

Answer: C

Explanation:
* Problem:OKE web tier pods cannot reach the application tier.
* Traffic Flow:Web tier (OKE) initiates outbound (egress) traffic to application tier (port 8080).
* NSG Role:Controls traffic at VNIC level; must allow egress from OKE and ingress to app tier.
* Evaluate Options:
* A:Missing egress rule on OKE NSG blocks traffic; plausible but incomplete context.
* B:Ingress on OKE NSG affects incoming traffic, not outbound to app tier; incorrect.
* C:No ingress on OKE NSG doesn't block egress to app tier; incorrect.
* D:Egress limited to internet blocks app tier access (port 8080); most likely.
* Conclusion:Missing egress rule to app tier NSG is the primary issue.
NSGs require explicit egress rules for outbound traffic. The Oracle Networking Professional study guide notes, "For OKE pods to communicate with other tiers, the node pool's NSG must include egress rules to the destination NSG or CIDR on the required ports" (OCI Networking Documentation, Section: Network Security Groups with OKE). Option D reflects a common misconfiguration in IaC setups.

NEW QUESTION # 81
In a multi-tier application architecture with separate public and private subnets, where should an OCI Bastion host be placed to provide secure access to resources in the private subnets without exposing them to the internet?

A. Behind an Internet Gateway in the public subnet.
B. Directly in the private subnet.
C. In a dedicated public subnet specifically for Bastion hosts.
D. In a separate VCN peered with the application VCN.

Answer: C

Explanation:
* Purpose:Secure access to private subnet resources via Bastion.
* Placement Considerations:Must be internet-accessible yet isolated.
* Evaluate Options:
* A:Private subnet lacks internet access for Bastion; incorrect.
* B:Dedicated public subnet balances accessibility and isolation; correct.
* C:Separate VCN adds complexity, unnecessary; less optimal.
* D:Ambiguous phrasing, but implies exposure; less precise than B.
* Conclusion:Dedicated public subnet is the best placement.
OCI Bastion requires public access with security. The Oracle Networking Professional study guide notes,
"Place the Bastion host in a public subnet with a dedicated configuration to allow secure SSH access to private subnet resources without exposing them directly" (OCI Networking Documentation, Section: Bastion Host Placement). Option B ensures this balance.

NEW QUESTION # 82
......

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Oracle Cloud Infrastructure 2025 Networking Professional Sample Questions (Q77-Q82):

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