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Q1.

A Network Engineer is provisioning a subnet for a load balancer that will sit in front of a fleet of application servers in a private subnet. There is limited IP space left in the VPC CIDR. The application has few users now but is expected to grow quickly to millions of users.

What design will use the LEAST amount of IP space, while allowing for this growth?

AUse two /29 subnets for an Application Load Balancer in different Availability Zones.

BUse one /29 subnet for the Network Load Balancer. Add another VPC CIDR to the VPC to allow for future growth.

CUse two /28 subnets for a Network Load Balancer in different Availability Zones.

DUse one /28 subnet for an Application Load Balancer. Add another VPC CIDR to the VPC to allow for future growth.

Answer: C

Q2.

An AWS CloudFormation template is being used to create a VPC peering connection between two existing operational VPCs, each belonging to a different AWS account. All necessary components in the 'Remote' (receiving) account are already in place.

The template below creates the VPC peering connection in the Originating account. It contains these components:

AWSTemplateFormation Version: 2010-09-09

Parameters:

Originating VCId:

Type: String

RemoteVPCId:

Type: String

RemoteVPCAccountId:

Type: String

Resources:

newVPCPeeringConnection:

Type: 'AWS::EC2::VPCPeeringConnection'

Properties:

VpcdId: !Ref OriginatingVPCId

PeerVpcId: !Ref RemoteVPCId

PeerOwnerId: !Ref RemoteVPCAccountId

Which additional AWS CloudFormation components are necessary in the Originating account to create an operational cross-account VPC peering connection with AWS CloudFormation? (Select two.)

AResources:NewEC2SecurityGroup:Type: AWS::EC2::SecurityGroup

BResources:NetworkInterfaceToRemoteVPC:Type: ''AWS::EC2NetworkInterface''

CResources:newEC2Route:Type: AWS::EC2::Route

DResources:VPCGatewayToRemoteVPC:Type: ''AWS::EC2::VPCGatewayAttachment''

EResources:newVPCPeeringConnection:Type: 'AWS::EC2VPCPeeringConnection'PeerRoleArn: !Ref PeerRoleArn

Answer: C, E

See the explanation below.

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_EC2.html

Q3.

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?

AUse a Network Load Balancer to automatically preserve the source IP address.

BUse a Network Load Balancer and enable the X-Forwarded-For attribute.

CUse a Network Load Balancer and enable the ProxyProtocol v2 attribute.

DUse an Application Load Balancer to automatically preserve the source IP address in the X-Forwarded-For header.

Answer: C

See the explanation below.

https://docs.aws.amazon.com/elasticloadbalancing/latest/network/load-balancer-target-groups.html#proxy-protocol

Q4.

A bank built a new version of its banking application in AWS using containers that content to an on-premises database over VPN connection. This application version requires users to also update their client application. The bank plans to deprecate the earlier client version. However, the company wants to keep supporting earlier clients through their on-premises version of the application to serve a small portion of the customers who haven't yet upgraded.

What design will allow the company to serve both newer and earlier clients in the MOST efficient way?

AUse an Amazon Route 53 multivalue answer routing policy to route older client traffic to the on-premises application version and the rest of the traffic to the new AWS based version.

BUse a Classic Load Balancer for the new application. Route all traffic to the new application by using an Elastic Load Balancing (ELB) load balancer DNS. Define a user-agent-based rule on the backend servers to redirect earlier clients to the on-premises application.

CUse an Application Load Balancer for the new application. Register both the new and earlier applications as separate target groups and use path-based routing to route traffic based on the application version.

DUse an Application Load Balancer for the new application. Register both the new and earlier application backends as separate target groups. Use header-based routing to route traffic based on the application version.

Answer: D

Q5.

An organization is using a VPC endpoint for Amazon S3. When the security group rules for a set of instances were initially configured, access was restricted to allow traffic only to the IP addresses of the Amazon S3 API endpoints in the region from the published JSON file. The application was working properly, but now is logging a growing number of timeouts when connecting with Amazon S3. No internet gateway is configured for the VPC.

Which solution will fix the connectivity failures with the LEAST amount of effort?

ACreate a Lambda function to update the security group based on AmazonIPSpaceChanged notifications.

BUpdate the VPC routing to direct Amazon S3 prefix-list traffic to the VPC endpoint using the route table APIs.

CUpdate the application server's outbound security group to use the prefix-list for Amazon S3 in the same region.

DCreate an additional VPC endpoint for Amazon S3 in the same route table to scale the concurrent connections to Amazon.

Answer: C

See the explanation below.

https://aws.amazon.com/blogs/aws/subscribe-to-aws-public-ip-address-changes-via-amazon-sns/

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