Exam FCP_WCS_AD-7.4 topic 1 question 32 discussion

Incorrect Options: B. NAT Gateway: A NAT Gateway is for outbound internet traffic from private subnets, not for inbound access. C. Adding a route to the default VPC route table forwarding all traffic to the internet gateway: While an internet gateway and a proper route configuration are essential for internet connectivity, this alone does not provide a front-end endpoint for inbound traffic. You still need a publicly accessible component (like a load balancer or a server with a public IP) to accept requests from the internet. Therefore, the correct combination that ensures both high availability and internet reachability is to deploy a load balancer (A) and host the servers across multiple AZs (D).

Add a route to the default virtual public cloud (VPC) route table forwarding all traffic to the internet gateway: This option is essential for making web servers reachable from the internet. It ensures that traffic from the VPC is routed correctly to the internet via the Internet Gateway (IGW). Without this configuration, the servers won’t be able to send or receive traffic from the internet, regardless of their availability setup. However, this does not guarantee high availability by itself, but it is a necessary step to enable internet access.

For me C make senses, if we want an instance to be reacheable from Internet, at least we need a default route pointing IGW for the traffic come back. D because if we want high availability we need to deploy the instances at least in 2 AZ.

A, D should be correct Network Load Balancer: Deploying a network load balancer ensures that incoming traffic is distributed across multiple web servers, providing high availability and redundancy. This setup helps in managing traffic efficiently and maintaining service uptime even if some servers fail (Option A). Multiple Availability Zones: Deploying web servers in multiple availability zones (AZs) enhances fault tolerance and availability. If one AZ goes down, servers in other AZs can continue to handle the traffic, ensuring the web application remains accessible (Option D). Other Options Analysis: Option B is incorrect because NAT Gateways are used to provide internet access to instances in private subnets, not to make private addresses reachable from the internet. Option C is not sufficient on its own for high availability. Adding a route to the default VPC route table forwarding traffic to the internet gateway makes the VPC internet-accessible but does not ensure high availability.