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Oracle Cloud Infrastructure 2025 Networking Professional Sample Questions (Q118-Q123):

NEW QUESTION # 118
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 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).
  • D. The security list associated with the application server subnet does not allow ingress traffic from the load balancer's IP address range.

Answer: D

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 # 119
You are troubleshooting a network connectivity issue between a compute instance in a private subnet within your VCN and a service on the public internet using Cloud Shell. You suspect a problem with the network security group (NSG) rules associated with the instance's VNIC. Which Cloud Shell command and appropriate tool combination allows you to directly inspect the NSG configuration impacting the VNIC?

  • A. oci compute instance get --instance-id <instance_OCID> piped to grep NetworkSecurityGroupIds
  • B. oci network vnic get --vnic-id <instance_VNIC_OCID> piped to awk '/network_security_group_ids/
    {print $2}' | xargs oci network network-security-group get --nsg-id
  • C. oci network network-security-group get --nsg-id <NSG_OCID> piped to grep <instance_VNIC_OCID>
  • D. oci compute instance get --instance-id <instance_OCID> piped to jq '.vnics[].nic_id | oci network vnic get --vnic-id .' piped to jq '.network_security_group_ids[] | oci network network-security-group get -- nsg-id .'

Answer: D

Explanation:
* Goal:Inspect NSG rules for a VNIC from Cloud Shell.
* Command Flow:
* Get instance # Extract VNIC # List NSGs # Get NSG details.
* Evaluate Options:
* A:Direct NSG fetch lacks VNIC linkage; incomplete.
* B:Full pipeline from instance to NSG details; precise and correct.
* C:Grep is too basic, misses structure; incorrect.
* D:Awk parsing is fragile, less reliable than jq; less optimal.
* Conclusion:Option B provides the most robust inspection.
CLI with jq ensures accurate NSG retrieval. The Oracle Networking Professional study guide notes, "To troubleshoot NSG rules, use the OCI CLI to fetch instance VNIC details and associated NSG configurations, piping through jq for structured output" (OCI Networking Documentation, Section: CLI Troubleshooting).
Option B follows this methodology.


NEW QUESTION # 120
A financial services company is implementing a multicloud strategy, storing sensitive customer data in OCI due to its enhanced security features, running analytics workloads in AWS, and utilizing a SaaS application hosted in Google Cloud Platform (GCP). To comply with stringent data sovereignty regulations, the company requires that all traffic between OCI and AWS must transit exclusively within the United States. Which is the MOST critical consideration when choosing a connectivity solution to ensure compliance?

  • A. Using the native OCI Dynamic Routing Gateway (DRG) and AWS Virtual Private Gateway (VGW) with IPSec VPNs, as this automatically ensures traffic stays within the specified region
  • B. Selecting a FastConnect partner who can guarantee that all OCI-AWS traffic will stay within the United States geographic boundary
  • C. Using a generic VPN tunnel between OCI and AWS, ensuring both gateways are located within US regions
  • D. Leveraging public internet-based connectivity with geographically restricted DNS resolution to limit traffic outside the US

Answer: B

Explanation:
* Requirement: OCI-AWS traffic must stay in the US for sovereignty compliance.
* Option A: A FastConnect partner guaranteeing US-only transit ensures compliance via a private, controlled path-correct.
* Option B: DRG and VGW with VPN don't guarantee US-only routing over public internet-incorrect.
* Option C: Generic VPN can't control internet paths despite US gateways-incorrect.
* Option D: Public internet with DNS restrictions doesn't enforce routing-incorrect.
* Conclusion: Option A is the most critical consideration.
Oracle states:
* "Choose a FastConnect partner that can guarantee geographic routing constraints, such as US-only transit, to meet data sovereignty requirements."This supports Option A. Reference:FastConnect Compliance - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/fastconnect.
htm#compliance).


NEW QUESTION # 121
You are designing a backup solution in OCI. Compute instances in a private subnet need to back up data to OCI Object Storage. Security policy mandates that data transfer must not traverse the public internet. You need to choose the most secure and cost-effective method for accessing Object Storage. Which endpoint
/gateway configuration should you implement?

  • A. Configure a NAT Gateway and use public Object Storage endpoints with HTTPS enabled.
  • B. Configure an Internet Gateway and use public Object Storage endpoints.
  • C. Configure a Dynamic Routing Gateway (DRG) and FastConnect to a remote region and use public Object Storage endpoints.
  • D. Configure a Service Gateway with the Oracle Services Network service CIDR label for your region, and use regional Object Storage endpoints.

Answer: D

Explanation:
* Requirement Analysis:The solution must ensure private access to Object Storage without public internet traversal, while being cost-effective.
* Evaluate OCI Components:
* Internet Gateway:Provides public internet access, unsuitable for private connectivity.
* NAT Gateway:Allows outbound internet access from private subnets, but traffic still exits OCI.
* Service Gateway:Enables private access to OCI services like Object Storage within the same region.
* DRG with FastConnect:Used for on-premises connectivity, not intra-OCI service access.
* Option Assessment:
* A:Uses public internet, violating the security policy.
* B:HTTPS encrypts data, but traffic traverses the internet via NAT, violating the policy.
* C:Service Gateway keeps traffic within OCI's private network, meeting security and cost goals.
* D:Overly complex and costly, with public endpoints contradicting the requirement.
* Conclusion:Service Gateway with regional Object Storage endpoints ensures private, secure, and cost- effective access.
The Service Gateway is designed for private access to OCI services like Object Storage, avoiding the public internet. The Oracle Networking Professional study guide states, "A Service Gateway allows instances in a private subnet to access supported OCI services without an Internet Gateway or NAT Gateway, ensuring traffic remains within the Oracle network" (OCI Networking Documentation, Section: Service Gateway).
Using the Oracle Services Network service CIDR label for the region ensures compatibility with Object Storage endpoints, optimizing cost and security.


NEW QUESTION # 122
Your company needs to connect an on-premises data center to an OCI Virtual Cloud Network (VCN) to extend their existing infrastructure to the cloud. The connection MUST be secure, reliable, and provide consistent, low-latency access to resources in both environments. Resources in the OCI VCN need access to the on-premises servers, and resources in the on-premises data center need to access the compute instances located in a private subnet within the OCI VCN. Which is the MOST appropriate architectural design for establishing connectivity in this hybrid cloud environment, considering the available endpoints and gateway options in OCI?

  • A. Implement a FastConnect connection from the on-premises network to the OCI VCN utilizing a Dynamic Routing Gateway (DRG) in OCI and implement a Site-to-Site VPN connection as backup.
  • B. Configure a public endpoint for each resource in the OCI VCN that needs to be accessed from the on- premises network.
  • C. Implement a Site-to-Site VPN connection between the on-premises network and the OCI VCN, utilizing a Dynamic Routing Gateway (DRG) in OCI.
  • D. Establish a FastConnect connection between the on-premises network and the OCI VCN, utilizing a Dynamic Routing Gateway (DRG) in OCI.

Answer: A

Explanation:
* Requirements: Secure, reliable, low-latency, bidirectional access with redundancy.
* Option A: VPN via DRG is secure but lacks low latency and redundancy-insufficient.
* Option B: FastConnect via DRG offers low latency and security but no redundancy-partial fit.
* Option C: Public endpoints are insecure and high-latency-incorrect.
* Option D: FastConnect for primary low-latency access, VPN as backup for redundancy-correct and most appropriate.
* Conclusion: Option D meets all criteria.
Oracle states:
* "FastConnect with DRG provides secure, low-latency hybrid connectivity. Add a Site-to-Site VPN for redundancy to ensure reliability."This supports Option D. Reference:Hybrid Cloud Connectivity - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/hybridcloud.htm).


NEW QUESTION # 123
......

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