ELB

routing to route traffic from web servers to smart.com/api and from mobile devices to smart.com/mobile. A developer advises that the previous recommendation is not needed and that requests should be sent to api.smart.com and mobile.smart.com instead. Which of the following routing options were discussed? (select two)

• URL Path

• cookie value

• client IP

• web browser version

• hostname

You are responsible for an application that runs on multiple Amazon EC2 instances. In front of the instances is an Internet-facing load balancer that takes requests from clients over the internet and distributes them to the EC2 instances. A health check is configured to ping the index.html page found in the root directory for the health status. When accessing the website via the internet visitors of the website receive timeout errors. What should be checked first to resolve the issue?

• Security Groups

• IAM Roles

• The application is down

• The ALB is warming up

Your web application front end consists of 5 EC2 instances behind an Application Load Balancer. You have configured your web application to capture the IP address of the client making requests. When viewing the data captured you notice that every IP address being captured is the same, which also happens to be the IP address of the Application Load Balancer. What should you do to identify the true IP address of the client?

• Look into the X-Forward-Proto header in the backend

• Modify the front-end of the website so that the users send their IP in the requests

• Look into the X-Forward-For header in the backend

• Look into the client's cookie

You have an Application Load Balancer listening on port 80 registered with a single EC2 instance also listening on port 80. You plan on changing the listener. Which of the following options is not a supported listener?

• Websocket

• HTTP

• HTTPS

• TCP

Your company uses an Application Load Balancer to route incoming end-user traffic to applications hosted on Amazon EC2 instances. The applications capture incoming request information and store it in the Amazon Relational Database Service (RDS) running Microsoft SQL Server DB engines. Your team lead requested that you capture the clients IP address, how will you achieve that?

• We should change the client application to send their IP as part of the payloads

• Use the header X-Forwarded-For

• Use the header X-Forwarded-IP

• Change the security groups rules

You are running a cloud file storage website with an Internet-facing load balancer, which routes requests from users over the internet to 10 EC2 instances registered to the load balancer. Your users are complaining that your website always asks them to re-authenticate when they switch pages. You are puzzled because this behavior is not seen in your local machine or dev environment. What could be the reason?

• The Load Balancer does not have stickiness enabled

• The application must have a bug

• The EC2 instances log out users because the don't see their true IP's

• The Load Balancer does not have TLS enabled

New cloud-developers is learning to reap the benefits of elasticity, horizontal scalability, and high availability. They inherited a web application running in the us-east-1 region with three availability zones (us-east-1a, us-east1-b, and us-east-1c) whose incoming web traffic is routed by a load balancer. When one of the EC2 instances hosting the web application crashes, they realize that the load balancer continues to route traffic to that instance causing intermittent issues. Which of the following should the developer do to minimize this problem?

• Enable Health Checks

• Enable Stickiness

• Enable Multi AZ deployments

• Enable SSL

You are designing a high-performance application that requires millions of connections. You have several EC2 instances running Apache2 web servers and the application will require capturing the user’s original source IP address and source port without the use of X-Forwarded-For. Which of the following options will meet your needs?

• Application Load Balancer

• Network Load Balancer

• Elastic Load Balancer

• Classic Load Balancer

Your company has a load balancer in a VPC configured to be internet facing. The public DNS name assigned to the load balancer is myDns-1234567890.us-east-1.elb.amazonaws.com. When your client applications first load they capture the load balancer DNS name and resolve it to the IP address. The DNS name is a value used throughout other actions in the application. At load, client applications work well but unexpectedly stop working after a while. What is the reason for this?

• The load balancer is highly available and it's public IP may change. The DNS is constant

• Your security groups are not stable

• You need to enable stickiness

• You need to disable multi-AZ deployments

There are many clients complaining that the online trading application of an investment bank is always down. Your manager instructed you to re-design the architecture of the application to prevent the unnecessary service interruptions. To ensure high availability, you set up the application to use an ELB to distribute the incoming requests across an auto-scaled group of EC2 instances in two single Availability Zones.

In this scenario, what happens when an EC2 instance behind an ELB fails a health check?

• The EC2 instance gets terminated automatically by the ELB.

• The EC2 instance gets quarantined by the ELB for root cause analysis.

• The EC2 instance is replaced automatically by the ELB.

• The ELB stops sending traffic to the EC2 instance.