AWS SAA-C01题库：实例扩展与云计算定义

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include static content. They may also contain client-side scripts. Because your storage on Amazon S3 is

virtually unlimited you can scale infinitely. You also do not need to service dynamic content so a database

is not needed.

Reduced Redundancy Storage (RRS) is an Amazon S3 storage option that enables customers to reduce

their costs by storing noncritical, reproducible data at lower levels of redundancy than Amazon S3’s

standard storage.

The two answers are correct as using RRS doesn't alter the solution to the problem in any way. Reference:

http://docs.aws.amazon.com/AmazonS3/latest/dev/WebsiteHosting.html

QUESTION 40

You have designed an application which does the following.

. It checks for new items in an S3 bucket once per hour.

. If new items exist, a message is added to an SQS queue.

. It has several EC2 instances which retrieve messages from the SQS queue, parse the file, and send you

an email containing the relevant information from the file.

You upload a test file to the bucket, wait a couple hours and find that you have hundreds of emails from the

application.

Which of the following is the most likely cause for this volume of email? (Choose 2 answers)

A. To keep multiple instances from processing the same SQS message, your application must delete the

SQS message after processing it.

B. Messages are not being deleted following processing.

C. You are being spammed

D. Your SQS queue is not large enough

Correct Answer: AB

Section: (none)

Explanation

Explanation/Reference:

Explanation: Many instances can poll a single queue, but to keep multiple instances from processing the

same SQS message, your application must delete the SQS message after processing it. While SQS does

not guarantee a message will be processed only once, the same message being processed many times is

probably an indication that the message is not being

deleted following processing Reference:

http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-how-i t-

works.html#sqs-basic-requirements

QUESTION 41

You are leading the design of your company's AWS cloud environment. Your requirements make it clear

that a few departments will require a low latency network and up to 10GB of performance. You decide that

Placement Groups would be a good option for these departments. What requirements for EC2 instances

should be met when deployed in Placement Groups? (Choose 2 answers)

A. EC2 instances must be in multi-AZ for fault tolerance.

B. EC2 instances must be reserved instances.

C. EC2 instances must be in a single Availability Zone.

D. Choose instance types that support enhanced networking .

Correct Answer: CD

Section: (none)

Explanation

Explanation/Reference:

Explanation: A placement group is a logical grouping of instances within a single Availability Zone.

Placement groups are recommended for applications that benefit from low network latency, high network

throughput, or both. To provide the lowest latency, and the highest packet-

per-second network performance for your placement group, choose an instance type that supports

enhanced networking.

Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html

QUESTION 42

You are designing a web application that needs to be highly available and handle a high percentage of read

traffic. You are planning on designing a multi-AZ environment for high availability. You are considering

using read replicas to help offset some of the read traffic. Your client wants to discuss multiple options for

handling large amounts of read traffic. What other option can you suggest to handle the read traffic?

A. Promote the standby server to a read replica when needed.

B. Store read traffic on Redshift.

C. Use Elasticache to cache frequently used data.

D. Use DynamoDB to handle read traffic.

Correct Answer: C

Section: (none)

Explanation

Explanation/Reference:

Explanation: Amazon ElastiCache is a web service that makes it easy to deploy and run Memcached or

Redis protocol-compliant server nodes in the cloud. Amazon ElastiCache improves the performance of web

applications by allowing you to retrieve information from a fast, managed, in-memory system, instead of

relying entirely on slower disk-based databases. Amazon ElastiCache is ideally suited as a front-end for

Amazon Web Services like Amazon RDS and Amazon DynamoDB, providing extremely low latency for

high performance applications and offloading some of the request volume while these services provide

long lasting data durability. Reference: https://aws.amazon.com/elasticache/faqs/

QUESTION 43

Which of the following would be considered features of using Elastic Load Balancing to automatically

distribute incoming application traffic across multiple Amazon EC2 instances? (Choose 3 answers)

A. Elastic Load Balancing automatically scales its request handling capacity to meet the demands of

application traffic.

B. Elastic Load Balancing ensures that only healthy Amazon EC2 instances receive traffic by detecting

unhealthy instances and rerouting traffic across the remaining healthy instances.

C. Using Elastic Load Balancing you can quickly deploy and manage applications in the AWS cloud

without worrying about the infrastructure that runs those applications.

D. Elastic Load Balancing works with Amazon Virtual Private Cloud (VPC) to provide robust networking

and security features.

Correct Answer: ABD

Section: (none)

Explanation

Explanation/Reference:

Explanation: Elastic Load Balancing works with Amazon Virtual Private Cloud (VPC) to provide robust

networking and security features. Elastic Load Balancing ensures that only healthy Amazon EC2 instances

receive traffic by detecting unhealthy instances and rerouting traffic across the remaining healthy instances.

Elastic Load Balancing automatically scales its request handling capacity to meet the demands of

application traffic.

CloudFront delivers your content through a worldwide network of edge locations. Using Elastic Beanstalk,

you can quickly deploy and manage applications in the AWS Cloud without worrying about the

infrastructure that runs those applications.

Reference: https://aws.amazon.com/elasticloadbalancing/

QUESTION 44

You have been assigned to a client with an existing AWS cloud environment. They have a VPC with

multiple web servers in a public subnet and database servers in a private subnet. They purchased reserved

Linux instances up-front but are finding they underestimated their workload and would like to scale now.

What can you do with these instances to scale them without violating the term agreement of these

instances?

Change to a larger instance of any type.

Change to Spot instances of a larger type.

C. Change to a larger instance within the same instance family.

D. Change to On-Demand instances of a larger type.

Correct Answer: C

Section: (none)

Explanation

Explanation/Reference:

Explanation: A Reserved Instance (RI) is an EC2 offering that provides you with a significant discount on

EC2 usage when you commit to a one-year or three-year term. You can modify the Availability Zone of the

RI, change the scope of the RI from Availability Zone to region (and vice-versa), change the network

platform from EC2-VPC to EC2-Classic (and vice versa) or modify instance sizes within the same instance

family (on the Linux/Unix platform).

Reference: https://aws.amazon.com/ec2/faqs/

QUESTION 45

You are designing an AWS VPC for a large healthcare organization. The majority of the departments will

require basic, low to medium throughput for their day to day operations. But the Radiology and MRI group

continually sends very large imaging files and requires low latency and up to 10 Gbps throughput in a single

availability zone. What configuration will best meet these requirements?

A. Create the Radiology/MRI instances in a Read Replica Group.

B. Use a VPN for Radiology/MRI.

C. Create the Radiology/MRI instances in a Placement Group.

D. Use Direct Connect for Radiology/MRI.

Correct Answer: C

Section: (none)

Explanation

Explanation/Reference:

Explanation: A placement group is a logical grouping of instances within a single Availability

Zone. Placement groups are recommended for applications that benefit from low network latency, high

networkthroughput, or both. To provide the lowest latency, and the highest

packet-per-second network performance for your placement group, choose an instance type that supports

enhanced networking.

Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html

QUESTION 46

You have taken over an account where the client has an existing AWS cloud environment. They have an

RDS backend using MySQL. They have a medium sized instance for their database and are using

magnetic volumes for their storage. Due to a recent innovation by the company they are expecting an

exponential increase in traffic on their website. You plan on scaling up by increasing the instance size of

the database and adding read replicas. What other step can you take to scale up the environment?

A. Upgrade from Magnetic storage to General Purpose (SSD).

B. Make sure backups are done during off peak hours.

C. Create a multi-AZ environment.

D. Use an Elastic Load Balancer to route traffic efficiently.

Correct Answer: A

Section: (none)

Explanation

Explanation/Reference:

Explanation: To handle a higher load in your database, you can vertically scale up your master database

quickly by moving to a larger instance size. If you are using magnetic storage you can scale up vertically by

upgrading to General Purpose (SSD) storage or even Provisioned IOPS (SSD). To scale horizontally you

can add read replicas to offload read traffic.

Reference:

https://aws.amazon.com/blogs/database/scaling-your-amazon-rds-instance-vertically-and-h orizontally/

QUESTION 47

You've been assigned to a client in the process of designing their AWS Virtual Private Cloud. The technical

staff for the client has a basic knowledge of AWS. One of the admins is proposing the use of Network

Address Translation (NAT) instances for use with private subnets. You bring up the more recent

emergence of NAT Gateways to provide internet access to private subnets. What benefits can using a NAT

Gateway instead of a NAT instance provide? (Choose 2 answers)

A. NAT Gateway provides better availability.

B. NAT Gateway provides higher bandwidth.

C. NAT Gateway requires less administrative effort than NAT instances.

D. NAT Gateways provide auto scaling .

Correct Answer: AC

Section: (none)

Explanation

Explanation/Reference:

Explanation: NAT gateways provides better availability, and requires less administrative effort. For common

use cases, it is recommend that you use a NAT gateway rather than a NAT instance. NAT gateways are in

each Availability Zone and are implemented with redundancy. NAT instances use a script to manage

failover. NAT Gateways are high bandwidth and support bursts of up to 10Gbps. NAT instance bandwidth

is dependent on the bandwidth of the instance type but are typically lower bandwidth than NAT Gateways.

Reference: http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_NAT_Instance.html

QUESTION 48

You've been placed in charge of your company's VPC. Part of your plan is to develop efficient use of auto

scaling of EC2 instances and a key to this will be bootstrapping for newly created instances. You want to

configure new instances as quickly as possible to get them in to service efficiently upon startup. What

benefits of bootstrapping can you utilize? (Choose 3 answers)

A. Bootstrapping can enroll an instance into a directory service.

B. Bootstrapping can install application software.

C. Bootstrapping can increase network throughput.

D. Bootstrapping can apply patches and OS updates.

Correct Answer: ABD

Section: (none)

Explanation

Explanation/Reference:

Explanation: When you launch an instance in Amazon EC2, you have the option of passing user data to the

instance that can be used to perform common automated configuration tasks and even run scripts after the

instance starts. You can pass two types of user data to Amazon EC2: shell scripts and cloud-init directives.

Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/user-data.html

QUESTION 49

You are helping a client design a static website which will potentially grow exponentially in the

first few years of existence. You outline the benefits of using S3 to host this Website. What characteristics

of S3 elasticity and scalability can you feature? (Choose 2 answers)

A. S3 supports an unlimited number of files in a bucket.

B. S3 bucket names can be replicated in multiple regions.

C. S3 asynchronously replicates information to all availability zones within a region.

D. S3 asynchronously replicates information to other regions.

Correct Answer: AC

Section: (none)

Explanation

Explanation/Reference:

Explanation: With Amazon S3, you can store as much data as you want and access it when needed. S3

supports and unlimited number of files in a bucket so it is not necessary to know your storage needs up

front or try to estimate. S3 can be scaled quickly and appropriately to meet the storage demands of your

environment. S3 asynchronously replicates information to all availability zones within a region. Amazon S3

scales to support very high request rates. If your request rate grows steadily, Amazon S3 automatically

partitions your buckets as needed to support higher request rates.

Reference:

http://docs.aws.amazon.com/AmazonS3/latest/dev/request-rate-perf-considerations.html

QUESTION 50

You run a stateless web application with the following components:

. An Elastic Load Balancer.

. Web/Application servers on EC2.

. A MySQL RDS database with 3000 provisioned IOPS.

You notice that the average response time for users is increasing. Looking at CloudWatch, you observe

97% CPU usage on the Web/Application servers and 20% CPU usage on the database. The average

number of database disk operations varies between 1000 and 1500. How would you improve performance?

(Choose 2 answers)

A. Use Auto Scaling to add additional Web/Application servers based on CPU load threshold

B. Use Amazon RDS Read Replicas to improve your IOPS

C. Choose a different EC2 instance type for the Web/Application servers with a more appropriate CPU/

Memory ratio

D. Increase your provisioned IOPS to 5000

Correct Answer: AC

Section: (none)

Explanation

Explanation/Reference:

Explanation: Because of the 97% CPU usage on the Web/Application servers using larger instance types

or using auto scaling to add more servers will alleviate this problem.

You have 3000 provisioned IOPS and the average number of database disk operations varies between

1000 and 1500 so you do not need to change your database at all.

Reference: https://d0.awsstatic.com/whitepapers/aws-web-hosting-best-practices.pdf

QUESTION 51

You are setting up your company's Virtual Private Cloud (VPC). It is time to select the virtual hardware and

the software to be provisioned for the instances you will launch within the VPC. You will do this by selecting

the Instance Types and Amazon Machine Images (AMI). Which item is not defined by the AMI?

Virtual CPUs

B. Operating system

C. The initial state of any patches

D. Application or System Software

Correct Answer: A

Section: (none)

Explanation

Explanation/Reference:

Explanation: An Amazon Machine Image (AMI) is a template that contains a software configuration (for

example, an operating system, an application server, and applications). The AMI includes the operating

system, initial state of any patches, and any application software. For example, you can select an AMI that

has SQL Server. The virtual CPUs are not part of the AMI but are defined by the instance type.

Reference:

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instances-and-amis.html

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