Fixing Internet Connectivity Issue
Question
You are helping a customer troubleshoot a problem.
The customer has several Oracle Linux servers in a private subnet within a Virtual Cloud Network (VCN)
The servers are configured to periodically communicate to the Internet to get security patches for applications installed on them.
The servers are unable to reach the internet.
An Internet Gateway has been deployed in the public subnet in the VCN and the appropriate routes are configured in the Route Table associated with the public subnet.
Based on cost considerations, which option will fix this issue? (Choose the best answer)
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D.D.
The problem is that the Oracle Linux servers in the private subnet of the Virtual Cloud Network (VCN) are unable to reach the internet to get security patches for applications installed on them. An Internet Gateway has already been deployed in the public subnet of the VCN, and the appropriate routes are configured in the Route Table associated with the public subnet.
Option A: Create a NAT gateway in the VCN and configure the NAT gateway as the route target for the private subnet.
This option involves creating a NAT (Network Address Translation) gateway in the VCN and configuring the NAT gateway as the route target for the private subnet. NAT allows private IP addresses to communicate with the public internet by translating the private IP addresses to public IP addresses. This would allow the servers in the private subnet to communicate with the internet to get the necessary security patches. This option is a good choice for cost considerations since it only involves creating a NAT gateway and does not require additional resources.
Option B: Create another Internet Gateway and configure it as route target for the private subnet.
This option involves creating another Internet Gateway and configuring it as the route target for the private subnet. However, this option is not recommended since each VCN can only have one Internet Gateway, and creating another Internet Gateway would violate this rule.
Option C: Create a Public Load Balancer in front of the servers and add the servers to the Backend Set of the Public Load Balancer.
This option involves creating a Public Load Balancer in front of the servers and adding the servers to the Backend Set of the Public Load Balancer. However, this option is not recommended since load balancers are typically used for distributing traffic across multiple servers for high availability and scalability, not for enabling servers to communicate with the internet.
Option D: Implement a NAT instance in the public subnet of the VCN and configure the NAT instance as the route target for the private subnet.
This option involves implementing a NAT instance in the public subnet of the VCN and configuring the NAT instance as the route target for the private subnet. However, this option is not recommended since NAT instances are outdated and are no longer recommended for new deployments. The recommended approach is to use NAT gateways instead.
Therefore, the best option for fixing this issue based on cost considerations is to choose option A: Create a NAT gateway in the VCN and configure the NAT gateway as the route target for the private subnet. This option allows the servers in the private subnet to communicate with the internet to get the necessary security patches while also being cost-effective.
