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Oracle Cloud Infrastructure 2024 Networking Professional Sample Questions (Q12-Q17):

NEW QUESTION # 12
For maximum security, how should you subnet a VCN with a public web server, private app server, and DB server?

A. Single public subnet for web, single private for app & DB
B. Separate public & private subnets for each server
C. All subnets in the same Availability Domain
D. Overlapping public & private subnet address spaces

Answer: D

Explanation:
Isolation: This approach physically separates the public web server, which is directly accessible from the internet, from the private app and DB servers. This minimizes the attack surface and ensures that even if the web server is compromised, the internal servers remain secure.
Control: You can configure security lists for each subnet with specific ingress and egress rules, further restricting access to each server based on its specific needs.
Best Practices: This aligns with security best practices in cloud environments, where segmentation and isolation are fundamental principles.
Here are the drawbacks of the other options:
A) Single public subnet for web, single private for app & DB:
This exposes the app and DB servers indirectly through the web server, increasing the attack surface.
Granular control of network access becomes difficult.
B) Overlapping public & private subnet address spaces:
This creates unnecessary complexity and potential for misconfiguration.
It offers no clear security benefit compared to separate subnets.
D) All subnets in the same Availability Domain:
This increases the risk of a single event impacting all servers.
Availability is improved by placing servers in different Availability Domains and connecting them through private subnets across those domains.

NEW QUESTION # 13
When creating a Service Gateway endpoint for inter-tenancy communication, what approach reflects the principle of least privilege?

A. Allow access to all resources in the destination tenancy for specific users.
B. Grant access to specific resources in the destination tenancy for all users.
C. Grant broad access to all resources in the source tenancy.
D. Specify the allowed resources in both the source and destination tenancies.

Answer: D

Explanation:
A). Granting broad access to all resources in the source tenancy: This grants excessive and unnecessary access, creating a significant security risk.C. Allowing access to all resources in the destination tenancy for specific users: While better than option A, it still grants broader access than necessary to users, exposing more resources than required.D. Granting access to specific resources in the destination tenancy for all users: This gives all users access to specific resources, but it doesn,t limit access based on individual user needs, potentially exceeding the minimum required permissions.Option B is the most secure and adheres to the principle of least privilege by:
Specifying allowed resources in the source tenancy: Limits access to specific resources, preventing unauthorized access from other source resources.
Specifying allowed resources in the destination tenancy: Grants access only to the necessary resources within the other tenancy, minimizing the attack surface and potential damage.

NEW QUESTION # 14
You are experiencing connectivity issues between an on-premises network and a private subnet in your OCI VCN. What information can you obtain from OCI flow logs to help diagnose the problem?

A. Detailed packet capture data for each flow.
B. Security list rules applied to the subnet and associated security groups.
C. Route table entries and next hop information for the subnet.
D. Source and destination IP addresses of all network traffic.

Answer: D

Explanation:
Source and destination IP addresses: Knowing the IP addresses involved in communication attempts can help identify:
Whether traffic is reaching the intended target subnet or getting dropped somewhere.
If source IPs from your on-premises network are even attempting to reach the subnet.
Potential asymmetric routing issues where traffic flows differently in each direction.
While other options offer valuable information:
Detailed packet capture data (B): Flow logs generally don,t capture full packet contents, but might offer header information depending on your configuration. It,s less relevant for initial troubleshooting.
Security list rules (C): Can help identify if rules are blocking legitimate traffic, but won,t pinpoint routing or reachability issues directly.
Route table entries (D): Provide insights into routing paths, but without source and destination IP information, it,s hard to correlate them to specific traffic attempts.

NEW QUESTION # 15
For fine-grained control over access to OCI resources through the VPN connection. Which OCI service can help in achieving this?

A. Security List on the VCN
B. Site-to-Site VPN with advanced encryption options
C. Service Gateway with access control lists (ACLs)
D. Dynamic Routing Gateway (DRG) route tables

Answer: A

Explanation:
Granular Control: Security Lists offer specific inbound and outbound traffic filtering rules based on source IP addresses, destination IP addresses, ports, and protocols. This allows you to precisely control which resources within your VCN can be accessed from your on-premises network via the VPN tunnel.
Direct Enforcement: Security List rules are applied directly at the VCN level, ensuring granular control over traffic flow before it reaches specific resources within the VCN.
Flexibility: You can create multiple Security Lists with different rules to apply to different subnets or resources within your VCN, providing flexible access control based on your specific needs.
Integration with VPN: Security Lists work seamlessly with Site-to-Site VPN connections, allowing you to leverage granular access control alongside the secure tunnel established by the VPN.
Other options might contribute to security, but they don,t directly address fine-grained control through the VPN connection:
B). Service Gateway with access control lists (ACLs): Service Gateway primarily manages outbound internet traffic within a VCN, not specifically controlling access through VPN connections.C. Dynamic Routing Gateway (DRG) route tables: DRG route tables control overall routing between VCNs and attached networks, not granular access control within a specific VCN.D. Site-to-Site VPN with advanced encryption options: While encryption protects data transmission, it doesn,t provide the level of granular access control offered by Security Lists within the VCN.

NEW QUESTION # 16
A security list rule is blocking inbound traffic to an instance in a public subnet. Which of the following OCI Networking tools can help you diagnose the issue?

A. Network Security Groups (NSGs)
B. Service Gateway
C. Route Tables
D. Network Analytics

Answer: A

Explanation:
Route Tables: Define routing paths within your VCN, not specifically related to security rules blocking traffic.
Network Analytics: While offering insights into network traffic patterns, it wouldn,t pinpoint the specific security list rule causing the issue.
Service Gateway: Manages connections between OCI and other cloud providers or on-premises networks, not directly relevant to security list rules within a VCN.
Network Security Groups (NSGs): Are the primary mechanism for controlling inbound and outbound traffic to your resources in OCI. By examining the NSGs associated with the affected instance, you can:
Review security list rules: Identify the specific rule blocking the desired traffic, analyzing its source, protocol, port, and direction.
Test and troubleshoot: Temporarily disable or modify rules to isolate the problematic rule and confirm its impact.
Inspect logs: Analyze NSG logs for details about blocked traffic attempts, including source IP addresses and protocols.
Therefore, NSGs provide the most direct and relevant information for diagnosing and resolving issues related to security list rules blocking inbound traffic.

NEW QUESTION # 17
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