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Oracle Cloud Infrastructure 2025 Networking Professional Sample Questions (Q21-Q26):

NEW QUESTION # 21
Your organization is migrating a critical three-tier application to OCI. The application requires a highly available and performant database tier. You plan to use Oracle Autonomous Database on Dedicated Exadata Infrastructure. The Autonomous Database subnet must adhere to the organization's security policy, which mandates no direct internet access and private access to other VCN subnets. You need to ensure the proper IP address allocation and routing. Which of the following procedural steps is most effective for achieving this?

  • A. Create a public subnet for the Autonomous Database and configure a Service Gateway with access to all Oracle Services in OCI. Configure NSG rules allowing only traffic from the application's compute instances.
  • B. Create a public subnet for the Autonomous Database, assign it a public IP address, and configure a Service Gateway with access to all Oracle Services in OCI. Configure routing to an Internet Gateway.
    Secure access using Security Lists allowing traffic only from approved IP ranges.
  • C. Create a private subnet for the Autonomous Database and configure a Service Gateway with access to Autonomous Database Oracle Services in OCI. Configure NSG rules allowing only traffic from the application's compute instances, and configure routing to a Dynamic Routing Gateway (DRG) for access to other VCN subnets. Reserve a large CIDR block for future database expansion.
  • D. Create a private subnet for the Autonomous Database and configure a Service Gateway with access to only Object Storage and Yum Server Oracle Services in OCI. Configure NSG rules allowing only traffic from the application's compute instances, and configure routing to a Dynamic Routing Gateway (DRG) for access to other VCN subnets.

Answer: C

Explanation:
* Requirements:Private subnet, no internet, access to other VCN subnets, HA database.
* Analyze Components:
* Public Subnet:Internet-exposed, against policy.
* Private Subnet:No internet, aligns with policy.
* Service Gateway:For OCI services, not ADB connectivity.
* DRG:For inter-VCN routing.
* NSGs:Granular traffic control.
* Evaluate Options:
* A:Public subnet violates no-internet policy; incorrect.
* B:Service Gateway for Object Storage/Yum irrelevant to ADB; incomplete.
* C:Private subnet, NSGs, DRG, and CIDR planning meet all needs; correct.
* D:Public subnet with internet access; violates policy.
* Conclusion:Option C is the most effective approach.
Autonomous Database requires private deployment for security. The Oracle Networking Professional study guide notes, "For Autonomous Database on Dedicated Exadata, use a private subnet with NSGs for access control and a DRG for inter-VCN connectivity, reserving CIDR for scalability" (OCI Networking Documentation, Section: Autonomous Database Networking). Service Gateway isn't used for ADB access, but the private setup ensures compliance.


NEW QUESTION # 22
Your organization is deploying a critical database application on OCI. To ensure high availability, you have deployed the database instances across multiple availability domains (ADs) within asingle region. You need to distribute client connections to the database instances and ensure that the load balancer can handle long- lived TCP connections with minimal overhead. Session persistence is not required. Which OCI load balancing solution would you choose in this scenario to minimize latency and connection establishment overhead?

  • A. Application Load Balancer with TCP health checks.
  • B. Application Load Balancer with HTTP health checks.
  • C. Network Load Balancer with TCP health checks.
  • D. Flexible Load Balancer with HTTP health checks.

Answer: C

Explanation:
* Requirements:Low-latency, minimal overhead for TCP connections, no session persistence.
* Load Balancer Types:
* Application Load Balancer (ALB):Layer 7, higher overhead, suited for HTTP/HTTPS.
* Network Load Balancer (NLB):Layer 4, low overhead, ideal for TCP/UDP.
* Evaluate Options:
* A:ALB with HTTP checks is for HTTP traffic, adds overhead; unsuitable.
* B:NLB with TCP checks is optimized for TCP, low latency; best fit.
* C:ALB with TCP checks still has Layer 7 overhead; less efficient.
* D:"Flexible Load Balancer" isn't a specific OCI service; incorrect.
* Conclusion:NLB minimizes latency and overhead for TCP connections.
The Network Load Balancer is designed for high-performance TCP scenarios. The Oracle Networking Professional study guide states, "Network Load Balancer operates at Layer 4, providing low-latency, high- throughput load balancing for TCP/UDP traffic with minimal overhead, ideal for database connections" (OCI Networking Documentation, Section: Load Balancing). TCP health checks ensure instance availability without session persistence complexity.


NEW QUESTION # 23
You have successfully enabled DNSSEC on your OCI DNS zone and provided the DS record to your domain registrar. However, when you test your DNS configuration using online DNSSEC validation tools, you are still seeing errors indicating that DNSSEC validation is failing. What is the most likely reason for this failure?

  • A. The OCI DNS resolver is not configured to validate DNSSEC signatures.
  • B. The DNSSEC algorithm used by OCI DNS is not supported by the validation tools.
  • C. The domain registrar has not yet published the DS record in the parent zone, preventing the chain of trust from being established.
  • D. The Time To Live (TTL) value for your DNS records is too low, causing validation errors.

Answer: C

Explanation:
* Problem:DNSSEC validation fails post-setup.
* DNSSEC Chain:Requires DS record in parent zone for trust.
* Evaluate Causes:
* A:Low TTL affects caching, not validation; unlikely.
* B:Missing DS in parent zone breaks chain; most likely.
* C:Resolver config is client-side, not affecting external tools; incorrect.
* D:OCI uses standard algorithms; highly unlikely.
* Conclusion:Registrar delay in publishing DS is the primary cause.
DNSSEC relies on the parent zone. The Oracle Networking Professional study guide explains, "DNSSEC validation fails if the registrar hasn't published the DS record in the parent zone, as this breaks the chain of trust" (OCI Networking Documentation, Section: DNSSEC Troubleshooting). This is a common post- enablement issue.


NEW QUESTION # 24
You are working as an OCI Network Specialist. Your company is migrating its on-premises IPv6 network to OCI. As part of the migration, you need to enable communication between the on-premises network and a VCN in OCI using FastConnect. Your company utilizes global unicast IPv6 addresses on-premises and wants to continue utilizing those addresses in OCI. However, you have a restriction that compute instance traffic must be limited to IPv6 only. After assigning IPv6 addresses from the prefix to the instance, they cannot ping external IPv6 addresses. What configuration most likely addresses this issue?

  • A. You can't use your own IPv6 address space in OCI. You must use OCI's provided ULA.
  • B. Ensure that there are IPv6 default routes (::/0) pointing to a NAT Gateway in your VCN route tables.
  • C. Ensure that there is a Service Gateway attached to the VCN with a default route (::/0) in your subnet route table.
  • D. Ensure that there is an Internet Gateway (IGW) attached to the VCN with a default route (::/0) in your subnet route table.

Answer: D

Explanation:
* Problem: Instances with IPv6-only traffic can't ping external IPv6 addresses despite FastConnect and IPv6 prefixes.
* Option A: OCI supports Bring Your Own IP (BYOIP) for IPv6, including global unicast addresses, so this is incorrect.
* Option B: NAT Gateways are for IPv4 outbound traffic, not IPv6-irrelevant here.
* Option C: For IPv6-only instances to reach external IPv6 addresses (beyond FastConnect),an Internet Gateway (IGW) is required with a default route (::/0) in the subnet route table. This enables public IPv6 connectivity-correct.
* Option D: Service Gateway is for OCI services, not general IPv6 internet access-incorrect.
* Conclusion: Option C fixes the issue by enabling IPv6 internet access.
Oracle states:
* "To enable IPv6 traffic to the internet, attach an Internet Gateway to the VCN and add a route rule for ::
/0. OCI supports BYOIP for public IPv6 prefixes."This aligns with Option C. Reference:IPv6 in OCI - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingIPv6.htm).


NEW QUESTION # 25
You are a Network Engineer designing a hybrid cloud architecture for a large enterprise. The company requires secure and private connectivity between their on-premises network and their OCI VCN. They have sensitive data that cannot traverse the public internet. Which OCI VCN gateway is most appropriate for establishing this connection, ensuring end-to-end data encryption and isolation from the public internet?

  • A. An Internet Gateway configured with default route rules.
  • B. A Dynamic Routing Gateway (DRG) connected to a FastConnect circuit.
  • C. A NAT Gateway configured with public IPs for all subnets.
  • D. A Service Gateway configured to access Oracle Services.

Answer: B

Explanation:
* Requirements:Private, encrypted connectivity to on-premises, no public internet.
* Gateway Options:
* Service Gateway:For OCI services, not on-premises.
* Internet Gateway:Public internet access, unsuitable.
* DRG with FastConnect:Private on-premises connectivity.
* NAT Gateway:Outbound internet, not private to on-premises.
* Evaluate Options:
* A:Limited to OCI services; incorrect.
* B:Uses public internet; violates policy.
* C:FastConnect via DRG ensures private, encrypted link; correct.
* D:Public IPs contradict requirement; incorrect.
* Conclusion:DRG with FastConnect is the most appropriate.
FastConnect provides private connectivity via DRG. The Oracle Networking Professional study guide states,
"A Dynamic Routing Gateway with FastConnect establishes a dedicated, private connection to on-premises networks, ensuring data encryption and isolation from the public internet" (OCI Networking Documentation, Section: FastConnect). This meets security and privacy needs.


NEW QUESTION # 26
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