A company's VPC has Amazon EC2 instances that are communicating with AWS services over the public internet. The company needs to change the connectivity so that the communication
does not occur over the public intemet.
The company deploys AWS PrivateLink endpoints in the VPC. After the deployment of the PrivateLink endpoints, the EC2 instances can no longer communicate at all with the required AWS
services.
Which combination of steps should a network engineer take to restore communication with the AWS services? (Select TWO.)
Answer : B, C
To use AWS PrivateLink, you need to create interface type VPC endpoints for the services that you want to access privately from your VPC1. These endpoints appear as elastic network interfaces (ENIs) with private IPs in your subnets2. To enable DNS resolution for these endpoints, you need to set the enableDnsSupport attribute to True for your VPC, and enable DNS support for each endpoint3. You also need to ensure that the VPC endpoint policy allows communication between your VPC and the service4. You do not need to create any route table entries or Route 53 hosted zones for the endpoints, as they are not required for PrivateLink5.
AWS PrivateLink FAQs -- Amazon Web Services 2: AWS PrivateLink and service endpoint - Amazon EC2 Overview and Networking Introduction for Telecom Companies 3: VPC Endpoints: Secure and Direct Access to AWS Services 4: AWS PrivateLink and service endpoint - Amazon EC2 Overview and Networking Introduction for Telecom Companies 5: AWS Private Link vs VPC Endpoint - Stack Overflow
A company is deploying a non-web application on an AWS load balancer. All targets are servers located on-premises that can be accessed by using AWS Direct Connect. The company wants to ensure that the source IP addresses of clients connecting to the application are passed all the way to the end server.
How can this requirement be achieved?
An organization is replacing a tape backup system with a storage gateway. there is currently no connectivity to AWS. Initial testing is needed.
What connection option should the organization use to get up and running at minimal cost?
Answer : A
An organization launched an IPv6-only web portal to support IPv6-native mobile clients. Front-end instances launch in an Amazon VPC associated with an appropriate IPv6 CIDR. The VPC IPv4 CIDR is fully utilized. A single subnet exists in each of two Availability Zones with appropriately configured IPv6 CIDR associations. Auto Scaling is properly configured, and no Elastic Load Balancing is used.
Customers say the service is unavailable during peak load times. The network engineer attempts to launch an instance manually and receives the following message: ''There are not enough free addresses in subnet 'subnet-12345677' to satisfy the requested number of instances.''
What action will resolve the availability problem?
Answer : B
You deploy an Amazon EC2 instance that runs a web server into a subnet in a VPC. An Internet gateway is attached, and the main route table has a default route (0.0.0.0/0) configured with a target of the Internet gateway.
The instance has a security group configured to allow as follows:
Protocol: TCP
Port: 80 inbound, nothing outbound
The Network ACL for the subnet is configured to allow as follows:
Protocol: TCP
Port: 80 inbound, nothing outbound
When you try to browse to the web server, you receive no response.
Which additional step should you take to receive a successful response?
A media company is implementing a news website for a global audience. The website uses Amazon CloudFront as its content delivery network. The backend runs on Amazon EC2 Windows instances behind an Application Load Balancer (ALB). The instances are part of an Auto Scaling group. The company's customers access the website by using service example com as the CloudFront custom domain name. The CloudFront origin points to an ALB that uses service-alb.example.com as the domain name.
The company's security policy requires the traffic to be encrypted in transit at all times between the users and the backend.
Which combination of changes must the company make to meet this security requirement? (Choose three.)
Answer : B, D, E
A company is hosting an application on Amazon EC2 instances behind a Network Load Balancer (NLB). A solutions architect added EC2 instances in a second Availability Zone to improve the availability of the application. The solutions architect added the instances to the NLB target group.
The company's operations team notices that traffic is being routed only to the instances in the first Availability Zone.
What is the MOST operationally efficient solution to resolve this issue?
Answer : A
When adding instances in a new Availability Zone to an existing Network Load Balancer (NLB), it is important to ensure that the new Availability Zone is enabled on the NLB. This will allow traffic to be routed to instances in both Availability Zones. This can be done by editing the settings of the NLB and selecting the new Availability Zone from the list of available zones.