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

NEW QUESTION # 37
Your company is migrating its publicly accessible website to OCI. You want to ensure the highest level of security and prevent DNS spoofing or cache poisoning attacks. You've decided to implement DNSSEC.
Which of the following is the most important first step in enabling DNSSEC for your domain using OCI DNS?

A. Configure the OCI DNS resolver to validate all incoming DNS responses using DNSSEC.
B. Enable DNSSEC on the OCI DNS zone for your domain and obtain the Delegation Signer (DS) record from OCI DNS.
C. Create a Traffic Management Steering Policy with the "DNSSEC" option enabled.
D. Generate a Key Signing Key (KSK) and a Zone Signing Key (ZSK) using a third-party tool and upload them to OCI DNS.

Answer: B

Explanation:
* Objective:Enable DNSSEC to secure OCI DNS against spoofing.
* DNSSEC Process:Requires enabling on the zone, generating keys, and updating the registrar.
* Evaluate Options:
* A:Steering policies manage traffic, not DNSSEC; incorrect.
* B:OCI DNS auto-generates keys; manual upload unnecessary; incorrect.
* C:Enabling DNSSEC starts the process, provides DS record; correct first step.
* D:Resolver validation is client-side, not enabling DNSSEC; incorrect.
* Conclusion:Enabling DNSSEC on the zone is the critical first step.
DNSSEC setup begins at the zone level. The Oracle Networking Professional study guide states, "The first step to enable DNSSEC in OCI DNS is to activate it on the zone, which generates keys and provides a DS record to share with your registrar" (OCI Networking Documentation, Section: DNSSEC Configuration). This establishes the chain of trust.

NEW QUESTION # 38
When troubleshooting inter-region connectivity issues between VCNs peered via a Dynamic Routing Gateway (DRG), which OCI tool is most effective for verifying the routing configuration and identifying potential misconfigurations?

A. OCI Audit Logs
B. DRG Route Tables
C. Network Visualizer
D. Oracle Cloud Guard

Answer: B

Explanation:
* Goal: Verify routing for inter-region VCN peering via DRG.
* Option A: Cloud Guard monitors security, not routing-incorrect.
* Option B: Audit Logs track changes, not current routing state-incorrect.
* Option C: DRG Route Tables define routing rules, directly showing misconfigurations-correct.
* Option D: Network Visualizer shows topology but not detailed routing rules-less effective.
* Conclusion: DRG Route Tables are most effective.
Oracle states:
* "DRG Route Tables are the primary tool for verifying and troubleshooting routing configurations for inter-region VCN peering."This validates Option C. Reference:DRG Troubleshooting - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingDRGs.htm#troubleshooting).

NEW QUESTION # 39
Consider a scenario where you have several private subnets within your VCN, and instances in these subnets need to access different OCI Object Storage buckets across various compartments. How can you efficiently manage and secure private access to Object Storage for all these subnets while adhering to the principle of least privilege?

A. Deploy a single NAT Gateway and manage access using Network Security Groups (NSGs) for each subnet.
B. Create a Private Endpoint for each Object Storage bucket within each private subnet.
C. Configure a single Internet Gateway and use IAM policies to control access at the bucket level.
D. Implement a Service Gateway within the VCN and utilize IAM policies and route tables to direct traffic to the appropriate Object Storage service endpoints.

Answer: D

Explanation:
* Goal: Private, secure, least-privilege access to Object Storage across subnets.
* Option A: Internet Gateway uses public access, violating privacy-incorrect.
* Option B: NAT Gateway is for internet, not OCI services-incorrect.
* Option C: Service Gateway provides private access; IAM policies enforce least privilege; route tables manage traffic-correct.
* Option D: Private Endpoints per bucket/subnet are inefficient and unscalable-incorrect.
* Conclusion: Option C is efficient and secure.
Oracle states:
* "A Service Gateway enables private access to Object Storage. Use IAM policies for least-privilege access and route tables for traffic control."This supports Option C. Reference:Service Gateway Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/servicegateway.
htm).

NEW QUESTION # 40
You are configuring a VCN with multiple subnets for a customer. The security team requires that all instances have IPv6 addresses. You configure the VCN with an IPv6 ULA CIDR block of fc00:1:1::/48 and create two private subnets. After launching instances in the two private subnets, you notice that they only have IPv4 addresses assigned. You have not manually configured any IPv6 addresses on the instances themselves. What steps are necessary to ensure the instances automatically receive IPv6 addresses?

A. Ensure that SLAAC (Stateless Address Autoconfiguration) is enabled on the operating system of the instances within the two subnets.
B. No further steps are needed. Instances will automatically receive IPv6 addresses within the configured subnets upon launch.
C. Make sure the "Assign public IPv4 address" option is not selected during instance creation. This will force the instance to default to IPv6 allocation.
D. IPv6 address assignment is only supported on instances launched in public subnets.

Answer: A

Explanation:
* Problem:Instances lack IPv6 addresses despite VCN IPv6 configuration.
* OCI IPv6 Behavior:IPv6 requires subnet enablement and OS support via SLAAC.
* Evaluate Options:
* A:Incorrect. OCI doesn't auto-assign IPv6 without OS configuration.
* B:Correct. SLAAC must be enabled on the instance OS for auto-assignment.
* C:Incorrect. IPv6 works in both public and private subnets.
* D:Incorrect. IPv4 and IPv6 assignments are independent.
* Conclusion:Enabling SLAAC on the OS ensures automatic IPv6 assignment.
IPv6 in OCI relies on SLAAC for automatic address assignment. The Oracle Networking Professional study guide states, "To enable IPv6 on instances, the VCN and subnet must have IPv6 CIDR blocks, and the instance OS must support SLAAC to automatically configure IPv6 addresses" (OCI Networking Documentation, Section: IPv6 Configuration). Without SLAAC, instances default to IPv4 only.

NEW QUESTION # 41
Your company is deploying a high-throughput, low-latency financial application on OCI. This application relies on raw TCP connections and requires connection persistence to maintain session state. You anticipate extremely high traffic volume and need a load balancer that can handle millions of concurrent connections with minimal overhead. You also want to use private endpoints. Which OCI load balancing option provides the most appropriate solution to meet these stringent performance and security requirements?

A. Regional Load Balancer with TCP load balancing and IP Hash Persistence
B. Global Load Balancer with TCP load balancing and Cookie-based Persistence
C. Network Load Balancer with TCP load balancing and 5-Tuple Hash Persistence
D. Regional Load Balancer with HTTP load balancing and Source IP Hash Persistence

Answer: C

Explanation:
* Requirements:High throughput, low latency, TCP, persistence, private endpoints.
* Load Balancer Options:
* ALB:Layer 7, higher overhead, HTTP-focused.
* NLB:Layer 4, low overhead, TCP/UDP optimized.
* Global LB:Global routing, not regional focus.
* Evaluate Options:
* A:ALB with IP Hash has overhead; less optimal.
* B:NLB with 5-Tuple Hash offers low latency, persistence, private support; best fit.
* C:Global LB with cookies is HTTP-based; incorrect.
* D:HTTP focus is irrelevant for raw TCP; incorrect.
* Conclusion:NLB with 5-Tuple Hash meets all criteria.
NLB is ideal for high-performance TCP. The Oracle Networking Professional study guide states, "Network Load Balancer provides low-latency, high-throughput TCP load balancing with 5-Tuple Hash persistence, supporting private endpoints for secure, high-volume applications" (OCINetworking Documentation, Section:
Network Load Balancer). This aligns with financial app needs.

NEW QUESTION # 42
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