Get Oracle 1Z0-1124-25 Exam Practice Questions - Real and Updated

Answer : B

Objective: Enable transitive routing via a network appliance (e.g., firewall) between VCNs.

Transitive Routing Setup: DRG connects VCNs; appliance processes traffic.

Key Requirement: DRG must route traffic to the appliance's private IP.

Evaluate Options:

A: Service Gateway is for OCI services, not transitive routing; incorrect.

B: Static routes on DRG to appliance ensure correct traffic flow; essential.

C: Load Balancer is optional, not essential for routing; incorrect.

D: LPG is for intra-region VCN peering, not appliance-DRG connection; incorrect.

Conclusion: DRG static routes to the appliance are critical for transitive routing.

Transitive routing with a network appliance requires explicit routing configuration. The Oracle Networking Professional study guide notes, 'To enable transitive routing through a network appliance, configure static routes in the DRG route table pointing to the appliance's private IP as the next hop' (OCI Networking Documentation, Section: Transitive Routing with DRG). This ensures traffic is processed by the appliance between VCNs.

Answer : C

Identify the Goal: Troubleshoot efficiently to determine if stateful inspection is causing intermittent connectivity issues.

Option A Evaluation: Disabling stateful inspection globally removes all security checks, potentially restoring connectivity but disrupting the entire VCN's security. This is inefficient and risky.

Option B Evaluation: Creating a bypass rule for the application server avoids inspection, which could confirm the issue but weakens security for that server. It's a workaround, not a diagnostic step, and requires policy changes during troubleshooting.

Option C Evaluation: Reviewing firewall logs for denied traffic is targeted and non-disruptive. Logs show if stateful inspection is dropping packets (e.g., due to session timeouts or rule mismatches), directly identifying the cause without altering configurations.

Option D Evaluation: Recreating the firewall is highly disruptive, time-consuming, and doesn't guarantee insight into the current issue. It's not a troubleshooting step.

Conclusion: Option C is the most efficient, as it leverages logs for precise diagnosis without impacting operations.

Per Oracle's Network Firewall documentation:

'Network Firewall logs provide detailed information about allowed and denied traffic, including source/destination IPs, ports, and protocols. Use logs to troubleshoot connectivity issues by identifying dropped packets due to stateful inspection or rule mismatches.'

'Stateful inspection tracks connection states; misconfigurations can lead to dropped sessions.'

This confirms logs are the best tool for diagnosing stateful inspection issues. Reference: Network Firewall Overview - Oracle Help Center (docs.oracle.com/en-us/iaas/Content/NetworkFirewall/overview.htm).

Answer : D

Objective: Allow VCN-A to access on-premises (192.168.1.0/24) via VPN, isolate VCN-B using DRG route tables effectively and securely.

Option A: Single route table for both VCNs with NSGs on VCN-B to block traffic. This works but relies on NSGs, which are secondary to routing. Routing-level isolation is more secure and efficient.

Option B: Single route table for VCN-A with the VPN route, default table (no VPN route) for VCN-B. This isolates VCN-B effectively at the routing level, but managing one table across all attachments can complicate scaling.

Option C: Two route tables, both with VPN routes, then blocking VCN-B with security lists. This is inefficient---routes are advertised unnecessarily, relying on security lists instead of routing isolation.

Option D: Two route tables---DRG-RT-A with VPN route for VCN-A, DRG-RT-B with no VPN route for VCN-B. This ensures VCN-B has no path to on-premises at the DRG level, providing the strongest isolation.

Conclusion: Option D is the most effective and secure, leveraging routing for isolation rather than secondary security controls.

Oracle documentation states:

'DRG route tables control traffic between VCN attachments and external connections (e.g., VPN). Associate a unique route table with each attachment to enforce specific routing policies.'

'To isolate a VCN, ensure its DRG route table contains no routes to the destination.'

Option D aligns with this approach. Reference: Dynamic Routing Gateway Overview - Oracle Help Center (docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingDRGs.htm).

Answer : A

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.

Answer : C

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).