Oracle 1z0-1124-25 - Oracle Cloud Infrastructure 2025 Networking Professional

Transitive Routing Goal:Traffic from a VCN to an on-premises network via DRG.

DRG Role:Acts as a virtual router connecting VCNs and on-premises networks.

Routing Options:

Static Routes:Manually defined, less scalable for dynamic environments.

Dynamic Routing (BGP):Automatically exchanges routes, ideal for hybrid setups.

Evaluate Options:

A:Static routes work but require manual updates; less efficient.

B:BGP dynamically propagates routes, ensuring correct routing; best fit.

C:LPG is for intra-region peering, not on-premises connectivity; incorrect.

D:Service Gateway is for OCI services, not on-premises; incorrect.

Conclusion:BGP ensures scalable, accurate routing through the DRG.

The DRG supports transitive routing with dynamic protocols like BGP. The Oracle Networking Professional study guide states, "For transitive routing between VCNs and on-premises networks via a DRG, configuring BGP on the DRG and CPE enables automatic route propagation, ensuring traffic is correctly routed" (OCI Networking Documentation, Section: Dynamic Routing Gateway). BGP is preferred over static routes for hybrid cloud scenarios.

Requirement:Private, secure access to OIC from a private subnet.

Endpoint Types:

Public:Internet-based; violates policy.

Service Gateway:For OCI services like Object Storage, not OIC.

Private:VCN-internal access to services; fits OIC.

Regional:Ambiguous, not specific; incorrect.

Evaluate Options:

A:Public internet; incorrect.

B:Wrong service target; incorrect.

C:Private within VCN; correct.

D:Undefined scope; incorrect.

Conclusion:Private Endpoint ensures secure connectivity.

Private Endpoints secure OIC access. The Oracle Networking Professional study guide notes, "A Private Endpoint allows applications in a private subnet to access Oracle Integration Cloud (OIC) within the OCI network, avoiding public internet exposure" (OCI Networking Documentation, Section: Private Endpoints). This meets the security policy directly.

Requirements:Isolated segments, efficient IP use, easy management.

Options Analysis:

A:Separate VCNs waste IPs, high overhead; inefficient.

B:Subnets with NSGs optimize IP use, simplify control; correct.

C:Compartments are for IAM, not network isolation; incorrect.

D:VM firewalls are complex, less secure; unsuitable.

Conclusion:Subnets with NSGs are most efficient.

Subnets and NSGs provide tenant isolation. The Oracle Networking Professional study guide states, "For multi-tenant applications, use separate private subnets within a VCN and enforce isolation with NSGs and routing rules, optimizing IP utilization and management" (OCI Networking Documentation, Section: VCN Design). This balances security and efficiency.

Goal:Protect web servers from SQL injection using Network Firewall.

Firewall Features:

Stateful Inspection:Basic traffic tracking, limited exploit detection.

IDPS:Detects and prevents exploits via signatures.

URL Filtering:Blocks URLs, not payload-based attacks.

Geo-location:Blocks regions, not specific threats.

Evaluate Options:

A:Default IPS lacks SQL injection specificity; insufficient.

B:IDPS with custom signatures targets SQL injection; most suitable.

C:URL Filtering doesn’t address SQL injection payloads; incorrect.

D:Geo-location is broad, not precise; ineffective.

Conclusion:IDPS with custom rules is the best feature.

IDPS in OCI Network Firewall is designed for exploit prevention. The Oracle Networking Professional study guide explains, "The Intrusion Detection and Prevention System (IDPS) uses signatures to detect and block specific threats like SQL injection, with custom rule sets for tailored protection" (OCI Networking Documentation, Section: Network Firewall IDPS). This ensures precise defense against web exploits.

Requirements:Quick, cheap, encrypted VPN; interim before FastConnect.

VPN Options:

Static VPN:Simple, native, low cost.

Third-Party Appliance:Complex, costly.

Service Gateway:Not for VPN; incorrect.

BGP VPN:Dynamic, more setup; less quick.

Evaluate Options:

A:Static VPN is fast, secure, budget-friendly; correct.

B:Appliance adds cost and complexity; incorrect.

C:Misaligned use of Service Gateway; incorrect.

D:BGP is overkill for pilot; less efficient.

Conclusion:Static VPN via DRG is most suitable.

Static VPN is ideal for quick setups. The Oracle Networking Professional study guide notes, "A Site-to-Site VPN with static routing via DRG provides a fast, encrypted connection for short-term needs, minimizing cost and setup time" (OCI Networking Documentation, Section: Site-to-Site VPN). This fits the pilot project perfectly.

Goal: Balance security and performance with encryption in a VCN.

Option A: TLS only to the load balancer leaves internal traffic unencrypted, risking exposure—insufficient security.

Option B: mTLS everywhere maximizes security but adds significant overhead (e.g., certificate management), impacting performance—overkill.

Option C: NSGs/Security Lists control access but don’t encrypt traffic—lacks protection for sensitive data.

Option D: TLS between OKE and Compute secures app-tier communication. Oracle Database Vault ensures ADB traffic is encrypted efficiently, leveraging built-in features—balanced approach.

Conclusion: Option D optimizes security and performance.

Oracle states:

"Use TLS for application traffic between tiers. Autonomous Database with Database Vaultprovides encryption in transit and at rest, minimizing overhead."This supports Option D. Reference:Security in OCI Networking - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Concepts/securityoverview.htm).

Context: Tunnel flapping over FastConnect vs. public internet.

Option A: Congestion/packet loss is less likely over FastConnect’s dedicated link than the unpredictable public internet—correct.

Option B: Mismatched keys/parameters would prevent tunnel establishment, not flapping—equally likely in both.

Option C: MTU issues cause fragmentation in both scenarios—equally likely.

Option D: BGP flapping is more relevant with FastConnect’s dynamic routing—more likely here.

Conclusion: Option A is less likely over FastConnect.

Oracle notes:

"FastConnect provides a stable, dedicated connection, reducing congestion and packet loss compared to public internet VPNs."This supports Option A. Reference:IPSec over FastConnect - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/settingupIPSec.htm#fastconnect).

Symptoms:VPN tunnel drops intermittently despite stable internet and IKE settings.

VPN Components:Requires IKE (UDP 500/4500) and ESP (IP 50) traffic.

Evaluate Options:

A:Incorrect CPE IP would prevent tunnel establishment, not intermittent drops; incorrect.

B:DRG outage would cause full downtime, not intermittent; unlikely.

C:Security rules blocking IKE/ESP intermittently (e.g., rate limiting) is common; most likely.

D:NAT-Traversal issues typically prevent initial setup, not intermittent drops; less likely.

Conclusion:Security rule misconfiguration is the most probable cause.

VPN stability depends on unblocked IKE and ESP traffic. The Oracle Networking Professional study guide notes, "Intermittent VPN tunnel drops are often caused by security rules or firewalls blocking IKE (UDP 500/4500) or ESP (IP Protocol 50) traffic" (OCI Networking Documentation, Section: Site-to-Site VPN Troubleshooting). This aligns with the scenario’s symptoms.

Problem: Instance in private subnet can’t reach Object Storage despite Service Gateway and routing.

Option A: Service Gateway enables private access; public IP isn’t required—incorrect.

Option B: Security lists/NSGs act as firewalls; if outbound traffic to Object Storage CIDR isn’t allowed, connectivity fails—most likely and correct.

Option C: Service Gateway defaults to all OCI services unless restricted; less likely given setup verification—incorrect.

Option D: Oracle Cloud Agent is for management, not connectivity—incorrect.

Conclusion: Option B is the most probable cause.

Oracle states:

"For private access to Object Storage via a Service Gateway, ensure security lists or NSGs allow outbound traffic to the Object Storage CIDR block."This supports Option B. Reference:Service Gateway Troubleshooting - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/servicegateway.htm#troubleshooting).

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.