Important Oracle 1Z0-1124-25 Exam Questions

Answer: A

Explanation:

Requirements: Encrypt FastConnect traffic with minimal bandwidth impact.

IPSec Options:

DRG VPN: Native OCI solution over FastConnect.

Firewall Appliances: Adds overhead and complexity.

Compute Instances: Resource-intensive, not scalable.

Internet VPN: Uses public internet, against requirements.

Evaluate Options:

A: DRG VPN with AES-GCM (low-overhead encryption) leverages FastConnect; optimal.

B: Firewalls with AES-256 add overhead, reducing bandwidth; less effective.

C: Compute-based VPN is inefficient and public-facing; unsuitable.

D: Public internet VPN violates privacy requirement; incorrect.

Conclusion: DRG VPN with AES-GCM is the most effective solution.

OCI supports IPSec over FastConnect via DRG. The Oracle Networking Professional study guide explains, 'A Site-to-Site VPN over FastConnect using the DRG provides encrypted traffic with low-overhead algorithms like AES-GCM, maintaining high bandwidth' (OCI Networking Documentation, Section: FastConnect with VPN). This meets regulatory and performance needs efficiently.

Answer: B

Explanation:

Analyze Connectivity Successes: Instance A can ping its subnet gateway (10.0.1.1), indicating that local subnet routing and security rules are functioning for IPv4. It can also ping Instance B's IPv6 address (fc00:1:2::20), confirming that IPv6 routing and security rules between subnets are operational.

Identify the Failure: Instance A cannot ping Instance B's IPv4 address (10.0.2.20). Since security lists and NSGs allow all traffic, the issue is unlikely to be a security configuration problem.

Examine Routing for Instance A: The route table for Instance A's subnet (10.0.1.0/24) has a rule directing traffic to 10.0.2.0/24 via the VCN Local Peering Gateway (LPG). In OCI, LPGs are used for intra-region VCN peering, but here, both instances are in the same VCN, so this rule is likely a misconfiguration or irrelevant unless peering is involved. However, the successful IPv6 ping suggests basic connectivity exists.

Check Return Path from Instance B: For a ping to succeed, Instance B must send ICMP replies back to Instance A (10.0.1.10). Instance B's subnet (10.0.2.0/24) needs a route table entry to send traffic to 10.0.1.0/24. Without this, replies are dropped, causing the IPv4 ping to fail. The IPv6 success indicates that IPv6 routing is correctly configured both ways, possibly via SLAAC or default routes.

Evaluate Options:

A: Incorrect. IPv6 is enabled, as Instance A pings Instance B's IPv6 address.

B: Correct. Missing route for 10.0.1.0/24 in Instance B's subnet prevents IPv4 replies.

C: Incorrect. Security lists and NSGs can filter IPv6 traffic in OCI.

D: Incorrect. Ping supports IPv6, as evidenced by the successful IPv6 ping.

The most probable cause is a missing route in Instance B's subnet route table. In OCI, each subnet has its own route table, and for instances in different subnets within the same VCN to communicate, both subnets must have appropriate routes. The successful IPv6 ping suggests that IPv6 routing is intact (likely due to default behavior or SLAAC), but IPv4 requires explicit routing. Per the Oracle Networking Professional study guide, 'Route tables must be configured to direct traffic to the appropriate next hop for inter-subnet communication within a VCN' (OCI Networking Documentation, Section: Virtual Cloud Networks).

Answer: C

Explanation:

Requirement: Low-latency, direct access to an on-premises SQL Server via FastConnect.

Option A: Internet Gateway with a public endpoint exposes the SQL Server to the internet, increasing latency and security risks---incorrect.

Option B: Service Gateway is for OCI services (e.g., Object Storage), not on-premises resources---incorrect.

Option C: FastConnect with a DRG provides a private, low-latency link. No additional OCI endpoint is needed; the SQL Server's private IP is accessed directly via DRG routing---correct.

Option D: Private Endpoints are for OCI services within the VCN (e.g., ADB), not on-premises resources---incorrect.

Conclusion: Option C leverages FastConnect and DRG for direct, secure access.

Oracle documentation notes:

'FastConnect with a DRG enables private, low-latency connectivity to on-premises networks. Configure route tables to access on-premises resources directly; no additional endpoints are required.'

This supports Option C. Reference: FastConnect Overview - Oracle Help Center (docs.oracle.com/en-us/iaas/Content/Network/Tasks/fastconnect.htm).

Answer: B

Explanation:

Objective: Grant requesting tenancy permission to initiate an RPC to the target tenancy.

RPC Process: Requires the requesting tenancy to create and connect the RPC, which needs specific IAM permissions in the target tenancy.

IAM Verbs:

manage: Broad permissions, too permissive for RPC initiation.

use: Allows creation and connection of RPCs, precise for this task.

inspect: Read-only, insufficient for initiating connections.

read: Read-only, insufficient for initiating connections.

Evaluate Options:

A: Too broad, includes unnecessary permissions; incorrect.

B: Precise permission for RPC initiation; correct.

C: Read-only, doesn't allow connection; incorrect.

D: Read-only, doesn't allow connection; incorrect.

Conclusion: 'use remote-peering-connections' is the essential policy.

RPCs require specific IAM policies for cross-tenancy connectivity. The Oracle Networking Professional study guide states, 'To initiate a Remote Peering Connection, the requesting tenancy needs an IAM policy with the 'use remote-peering-connections' verb targeting the acceptor tenancy's OCID' (OCI Networking Documentation, Section: Remote Peering Connections). This ensures controlled access for connection establishment.

Answer: C

Explanation:

Requirements: Low latency, high bandwidth, multi-region VCNs via one FastConnect, minimal cost/overhead.

DRG Strategy:

Multiple DRGs: Increases cost and complexity.

Single DRG: Centralizes management, reduces FastConnect attachments.

Evaluate Options:

A: Multiple DRGs and FastConnects; costly and complex; incorrect.

B: Remote peering connections imply RPC, not standard DRG attachments; less precise.

C: Single DRG with remote peering attachments; efficient and correct terminology; optimal.

D: LPGs are intra-region, not cross-region; incorrect.

Conclusion: Single DRG with remote peering attachments is most efficient.

A single DRG optimizes multi-region setups. The Oracle Networking Professional study guide notes, 'For connecting multiple VCNs across regions to a single FastConnect, use one DRG with remote peering attachments to minimize cost and management overhead' (OCI Networking Documentation, Section: DRG with FastConnect). Option C aligns with OCI's recommended architecture.