AWS Certified Solutions Architect – Associate Questions and Answers (Dumps and Practice Questions)

Question : When using the following AWS services, which should be implemented in multiple
Availability Zones for high availability solutions? Choose 2 answers
A. Amazon DynamoDB
B. Amazon Elastic Compute Cloud (EC2)
C. Amazon Elastic Load Balancing
D. Amazon Simple Notification Service (SNS)
E. Amazon Simple Storage Service (S3)

1. A,B
2. B,C
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4. D,E

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Question : Which features can be used to restrict access to data in S? Choose answers
A. Set an S3 ACL on the bucket or the object.
B. Create a CloudFront distribution for the bucket.
C. Set an S3 bucket policy.
D. Enable IAM Identity Federation
E. Use S3 Virtual Hosting

1. A,B
2. A,C
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4. D,E

Ans : 2
Exp :

Question : Which of the following are valid statements about Amazon S? Choose answers
A. S3 provides read-after-write consistency for any type of PUT or DELETE.
B. Consistency is not guaranteed for any type of PUT or DELETE.
C. A successful response to a PUT request only occurs when a complete object is saved.
D. Partially saved objects are immediately readable with a GET after an overwrite PUT.
E. S3 provides eventual consistency for overwrite PUTS and DELETES.

1. A,B
2. C,E
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4. C,D

Correct Answer : Get Lastest Questions and Answer : Exp: Q: What data consistency model does Amazon S3 employ?
Amazon S3 buckets in all Regions provide read-after-write consistency for PUTS of new objects and eventual consistency for overwrite PUTS and DELETES.
Amazon S3 buckets in the US Standard Region only provide read-after-write consistency when accessed through the Northern Virginia endpoint
(s3-external-1.amazonaws.com).

Question : You have a distributed application that periodically processes large volumes of data across
multiple Amazon EC2 Instances. The application is designed to recover gracefully from
Amazon EC2 instance failures. You are required to accomplish this task in the most costeffective
way. Which of the following will meet your requirements?

1. Spot Instances
2. Reserved instances
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4. On-Demand instances
Ans : 1
Exp : Amazon EC2 Spot instances are spare EC2 instances that you can bid on to run your cloud computing applications. Since Spot instances are often
available at a lower price, you can significantly reduce the cost of running your applications, grow your application's compute capacity and throughput for
the same budget, and enable new types of cloud computing applications.
Get the Best Value for Amazon EC2 Capacity
Spot instances run when your bid price exceeds the Spot price, and provide the reliability, security, performance, control, and elasticity of Amazon EC2, at
low market-driven prices.
Reduce Operating Costs
Reduce your operating costs by up to 50-90% with Spot, compared to On-Demand instances.

Question : Which of the following are characteristics of Amazon VPC subnets?

Choose 2 answers
A. Each subnet maps to a single Availability Zone
B. A CIDR block mask of /25 is the smallest range supported
C. Instances in a private subnet can communicate with the internet only if they have an Elastic IP.
D. By default, all subnets can route between each other, whether they are private or public
E. Each subnet spans at least 2 Availability zones to provide a high-availability environment

1. A,B
2. A,D
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4. C,E
5. A,E

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Explanation: Q. Within which Amazon EC2 region(s) is Amazon VPC available?
Amazon VPC is currently available in multiple Availability Zones in all Amazon EC2 regions.

Q. Can a VPC span multiple Availability Zones?
Yes.

Q. Can a subnet span Availability Zones?
No. A subnet must reside within a single Availability Zone.
Currently, Amazon VPC supports VPCs between /28 (in CIDR notation) and /16 in size. The IP address range of your VPC should not overlap with the IP address
ranges of your existing network.
Q. Is there a limit on how large or small a subnet can be?
The minimum size of a subnet is a /28 (or 14 IP addresses.) Subnets cannot be larger than the VPC in which they are created
with default vpc, amazon dhcp gives the instances a private ip, which cannot be routed out from the aws internet gateway (this device looks like IGW-xxxxxxx
via console). so unless the aws instances route to the internet thru the ipsec tunnel gateway (looks like VGW-xxxxxx), there are two ways to allow
connectivity out to the internet.
1) give vpc instances public elastic ip's, ensure a default route to the amazon internet gateway, then add a route for your private lan to the ipsec
termination gateway
2) set up a second instance with iptables masquerading, and then have default route to that device, while keeping the private lan route to the ipsec
termination point (back to your offic)
with #1, if instances have public eip, then may be connected to from the internet, if you are not careful with security groups.
with #2, all traffic is limited by the masquarading instance, which is then a point of failure. (by using amazons internet gateway, im sure they use
VRRP/HSRP/CARP/ETC, so its HA). also, although it has not happened to me personally, the private ip of the masq'ing box could change, and so you would need
to update dhcp lease info, and then force/wait to renew instance leases.

When you create each subnet, you provide the VPC ID and the CIDR block you want for the subnet. After you create a subnet, you can't change its CIDR block.
The subnet's CIDR block can be the same as the VPC's CIDR block (assuming you want only a single subnet in the VPC), or a subset of the VPC's CIDR block. If
you create more than one subnet in a VPC, the subnets' CIDR blocks must not overlap. The smallest subnet (and VPC) you can create uses a /28 netmask (16 IP
addresses), and the largest uses a /16 netmask (65,536 IP addresses).
Hence option C is out.
Hence Option A is out : You can create a VPC that spans multiple Availability Zones. For more information, seeCreating a VPC. After creating a VPC, you can
add one or more subnets in each Availability Zone. Each subnet must reside entirely within one Availability Zone and cannot span zones. Availability Zones
are distinct locations that are engineered to be isolated from failures in other Availability Zones. By launching instances in separate Availability Zones,
you can protect your applications from the failure of a single location. AWS assigns a unique ID to each subnet. Hence option A is out. And Option B is
correct.
When you create new subnets within a custom VPC, by default they can communicate with each other, across availability zones.

AWS Certified Solutions Architect – Associate Questions and Answers (Dumps and Practice Questions)

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