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Oracle Cloud Infrastructure 2025 Networking Professional Sample Questions (Q37-Q42):

NEW QUESTION # 37
Your organization uses a combination of OCI and AWS. Applications in OCI frequently access services hosted in AWS. You are experiencing slow and inconsistent data transfer speeds when transferring large files between the two clouds. You have a Site-to-Site VPN, but are considering other options. Which option is NOT a valid design consideration for improving the data transfer performance between OCI and AWS?

  • A. Evaluate the distance between the OCI and AWS regions you are using.
  • B. Deploy a dedicated interconnect through a network service provider that specializes in connecting OCI and AWS.
  • C. Evaluate using a third-party WAN optimization solution.
  • D. Determine the pricing scheme used for all OCI compute resources so you can predict when you need to scale bandwidth.

Answer: D

Explanation:
* Objective: Improve OCI-AWS data transfer performance.
* Option A: Region distance affects latency-valid.
* Option B: Dedicated interconnect boosts bandwidth and stability-valid.
* Option C: Compute pricing doesn't influence inter-cloud bandwidth-invalid.
* Option D: WAN optimization can enhance transfer efficiency-valid.
* Conclusion: Option C is not a design consideration for performance.
Oracle notes:
* "To optimize OCI-AWS connectivity, consider region proximity, dedicated interconnects, or WAN optimization. Compute pricing is unrelated to network performance."This excludes Option C.
Reference:Hybrid Cloud Networking - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network
/Concepts/hybridcloud.htm).


NEW QUESTION # 38
You are designing a solution to implement IPSec encryption over a FastConnect circuit between your on- premises network and OCI. You are concerned about the overhead of IPSec impacting themaximum MTU (Maximum Transmission Unit) size that can be supported. What is the most important factor to consider when determining the MTU size for the IPSec tunnel interfaces in this scenario?

  • A. The MTU size of the underlying Ethernet frames used by the FastConnect circuit.
  • B. The fragmentation settings on the DRG in OCI.
  • C. The smallest MTU supported by any device along the entire network path between your on-premises network and OCI, including the FastConnect provider's network.
  • D. The available bandwidth of the FastConnect circuit. A larger MTU requires a higher bandwidth connection.

Answer: C

Explanation:
* Concern:IPSec overhead reduces effective MTU.
* MTU Impact:Must avoid fragmentation, which degrades performance.
* Evaluate Factors:
* A:Bandwidth doesn't dictate MTU; incorrect.
* B:Smallest MTU in path (path MTU) prevents fragmentation; most critical.
* C:Ethernet MTU is a factor but not the limiting one; incomplete.
* D:DRG fragmentation settings are secondary to path MTU; incorrect.
* Conclusion:Path MTU is the key determinant to avoid fragmentation.
IPSec reduces MTU due to headers. The Oracle Networking Professional study guide explains, "When configuring IPSec over FastConnect, the most important factor is the smallest MTU supported along the entire path to prevent fragmentation and ensure efficient traffic flow" (OCI Networking Documentation, Section:
IPSec over FastConnect). Path MTU discovery is critical.


NEW QUESTION # 39
You are automating the deployment of a highly available OKE cluster across multiple availability domains (ADs) using Terraform. The OKE cluster needs to communicate with a database service running on a Compute instance in a separate private subnet within the same VCN. During the Terraform deployment, you encounter an error indicating that the Kubernetes pods cannot resolve the private IP address of the database instance. You've verified that DNS resolution works correctly for other resources within the VCN. What is the MOST probable reason for this DNS resolutionfailure?

  • A. The OKE cluster was created with a public endpoint only, and therefore cannot resolve private IP addresses.
  • B. The CoreDNS pods within the OKE cluster are not configured to use the VCN's DNS resolver.
  • C. The OKE cluster's node pool subnet is not associated with a route table that has a rule for the VCN's DNS resolver.
  • D. The security list associated with the database subnet does not allow ingress traffic from the OKE cluster' s node pool subnet on port 53 (DNS).

Answer: B

Explanation:
* Problem: OKE pods can't resolve private DB IP despite VCN DNS working.
* Option A: CoreDNS in OKE must forward to VCN's resolver for private IPs; misconfiguration is a common issue-correct.
* Option B: Security lists block traffic, not resolution; VCN DNS isn't hosted on the DB-incorrect.
* Option C: Public endpoint affects API access, not internal DNS-incorrect.
* Option D: Route tables don't control DNS resolution-incorrect.
* Conclusion: Option A is the most probable cause.
Oracle notes:
* "CoreDNS in OKE must be configured to forward queries to the VCN's DNS resolver (.169 address) for private IP resolution."This supports Option A. Reference:OKE DNS Configuration - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/ContEng/Tasks/contengdns.htm).


NEW QUESTION # 40
Your company has decided to migrate its on-premises data center to OCI. As a network engineer, you need to establish a secure and reliable connection between the on-premises network and the OCI VCN with the following constraints: high bandwidth requirements, low latency requirements, secure private connection, and redundant connectivity crucial for business continuity. Which is the MOST suitable and resilient solution, considering the VCN gateway options?

  • A. Multiple FastConnect circuits to a DRG in conjunction with multiple VPN Connect connections to the same DRG.
  • B. Multiple VPN Connect connections to a DRG.
  • C. A FastConnect circuit with a DRG.
  • D. A single VPN Connect connection to a DRG.

Answer: A

Explanation:
* Constraints: High bandwidth, low latency, secure private connection, redundancy.
* Option A: Single VPN Connect offers security but lacks high bandwidth, low latency, and redundancy-unsuitable for migration needs.
* Option B: Multiple VPNs improve redundancy but still rely on public internet, limiting bandwidth and latency performance compared to dedicated circuits.
* Option C: Single FastConnect provides high bandwidth, low latency, and privacy via a dedicated line, but lacks redundancy.
* Option D: Multiple FastConnect circuits ensure high bandwidth and low latency with redundancy.
Adding multiple VPNs as backup enhances resilience, meeting all constraints.
* Conclusion: Option D is the most suitable and resilient, balancing performance and continuity.
Oracle states:
* "FastConnect provides a private, high-bandwidth, low-latency connection to OCI. Use multiple circuits for redundancy."
* "Combine FastConnect with IPSec VPN for additional failover options."Option D aligns with this guidance. Reference:FastConnect Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content
/Network/Tasks/fastconnect.htm).


NEW QUESTION # 41
A development team has deployed a three-tier application in an OCI VCN. The application consists of a public-facing web tier, an application tier, and a database tier. The team reports that the web tier instances can communicate with the application tier instances, but the application tier instances cannot connect to the database tier instances. All security lists are configured to allow all traffic within the VCN. Which OCI Networking diagnostic tool would BEST help you quickly isolate the root cause of this connectivity issue?

  • A. VCN Flow Logs
  • B. Connection Diagnostics
  • C. OCI Bastion
  • D. Network Firewall

Answer: B

Explanation:
* Problem: App tier can't reach DB tier despite open security lists.
* Option A: Flow Logs show traffic details but require analysis, slowing diagnosis-less efficient.
* Option B: Connection Diagnostics tests connectivity (e.g., ping, traceroute) between resources, quickly pinpointing failures-correct.
* Option C: Network Firewall controls traffic, not diagnoses-incorrect.
* Option D: Bastion is for access, not troubleshooting-incorrect.
* Conclusion: Connection Diagnostics is the best tool for quick isolation.
Oracle states:
* "Connection Diagnostics provides rapid testing of network connectivity between OCI resources, ideal for isolating issues like tier-to-tier failures."This validates Option B. Reference:Network Troubleshooting - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks
/troubleshooting.htm#connectiondiagnostics).


NEW QUESTION # 42
......

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