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Q249. You have been using T2 instances as your CPU requirements have not been that intensive. However you now start to think about larger instance types and start looking at M and IV|3 instances. You are a little confused as to the differences between them as they both seem to have the same ratio of CPU and memory. Which statement below is incorrect as to why you would use one over the other?
A. M3 instances are less expensive than M1 instances.
B. IV|3 instances are configured with more swap memory than M instances.
C. IV|3 instances provide better, more consistent performance that M instances for most use-cases.
D. M3 instances also offer SSD-based instance storage that delivers higher I/O performance.
Answer: B
Explanation:
Amazon EC2 allows you to set up and configure everything about your instances from your operating system up to your applications. An Amazon Nlachine Image (AMI) is simply a packaged-up environment that includes all the necessary bits to set up and boot your instance.
M1 and M3 Standard instances have the same ratio of CPU and memory, some reasons below as to why you would use one over the other.
IV|3 instances provide better, more consistent performance that M instances for most use-cases. M3 instances also offer SSD-based instance storage that delivers higher I/O performance.
M3 instances are also less expensive than M1 instances. Due to these reasons, we recommend M3 for applications that require general purpose instances with a balance of compute, memory, and network resources.
However, if you need more disk storage than what is provided in M3 instances, you may still find M1 instances useful for running your applications.
Reference: https://aws.amazon.com/ec2/faqs/
Q250. In Amazon AWS, which of the following statements is true of key pairs?
A. Key pairs are used only for Amazon SDKs.
B. Key pairs are used only for Amazon EC2 and Amazon CIoudFront.
C. Key pairs are used only for Elastic Load Balancing and AWS IAM.
D. Key pairs are used for all Amazon services.
Answer: B
Explanation:
Key pairs consist of a public and private key, where you use the private key to create a digital signature, and then AWS uses the corresponding public key to validate the signature. Key pairs are used only for Amazon EC2 and Amazon CIoudFront.
Reference: http://docs.aws.amazon.com/generaI/latest/gr/aws-sec-cred-types.html
Q251. Your team has a tomcat-based Java application you need to deploy into development, test and production environments. After some research, you opt to use Elastic Beanstalk due to its tight integration with your developer tools and RDS due to its ease of management. Your QA team lead points out that you need to roll a sanitized set of production data into your environment on a nightly basis. Similarly, other software teams in your org want access to that same restored data via their EC2 instances in your VPC .The
optimal setup for persistence and security that meets the above requirements would be the following.
A. Create your RDS instance as part of your Elastic Beanstalk definition and alter its security group to allow access to it from hosts in your application subnets.
B. Create your RDS instance separately and add its IP address to your appIication's DB connection strings in your code Alter its security group to allow access to it from hosts within your VPC's IP address block.
C. Create your RDS instance separately and pass its DNS name to your app's DB connection string as an environment variable. Create a security group for client machines and add it as a valid source for DB traffic to the security group of the RDS instance itself.
D. Create your RDS instance separately and pass its DNS name to your's DB connection string as an environment variable Alter its security group to allow access to It from hosts In your application subnets.
Answer: A
Q252. Which DNS name can only be resolved within Amazon EC2?
A. Internal DNS name
B. External DNS name
C. Global DNS name
D. Private DNS name
Answer: A
Q253. What does Amazon E|astiCache provide?
A. A senrice by this name doesn't exist. Perhaps you mean Amazon C|oudCache.
B. A virtual server with a huge amount of memory.
C. A managed In-memory cache service.
D. An Amazon EC2 instance with the Memcached software already pre-installed.
Answer: C
Q254. A user has configured ELB with two EBS backed EC2 instances. The user is trying to understand the DNS access and IP support for ELB. Which of the below mentioned statements may not help the user understand the IP mechanism supported by ELB?
A. The client can connect over IPV4 or IPV6 using Dualstack
B. Communication between the load balancer and back-end instances is always through IPV4
C. ELB DNS supports both IPV4 and IPV6
D. The ELB supports either IPV4 or IPV6 but not both
Answer: D
Explanation:
Elastic Load Balancing supports both Internet Protocol version 6 (IPv6) and Internet Protocol version 4 (IPv4). Clients can connect to the user’s load balancer using either IPv4 or IPv6 (in EC2-Classic) DNS. However, communication between the load balancer and its back-end instances uses only IPv4. The user can use the Dualstack-prefixed DNS name to enable IPv6 support for communications between the client and the load balancers. Thus, the clients are able to access the load balancer using either IPv4 or IPv6 as their indMdual connectMty needs dictate.
Reference: http://docs.aws.amazon.com/EIasticLoadBaIancing/latest/DeveIoperGuide/UserScenariosForEC2.html
Q255. A user has created an EBS volume with 1000 IOPS. What is the average IOPS that the user will get for most of the year as per EC2 SLA if the instance is attached to the EBS optimized instance?
A. 950
B. 990
C. 1000
D. 900
Answer: D
Explanation:
As per AWS SLA if the instance is attached to an EBS-Optimized instance, then the Provisioned IOPS volumes are designed to deliver within 10% of the provisioned IOPS performance 99.9% of the time in a given year. Thus, if the user has created a volume of 1000 IOPS, the user will get a minimum 900 IOPS 99.9% time of the year.
Reference: http://aws.amazon.com/ec2/faqs/
Q256. You have just been given a scope for a new client who has an enormous amount of data(petabytes) that he constantly needs analysed. Currently he is paying a huge amount of money for a data warehousing company to do this for him and is wondering if AWS can provide a cheaper solution. Do you think AWS has a solution for this?
A. Yes. Amazon SimpIeDB
B. No. Not presently
C. Yes. Amazon Redshift
D. Yes. Your choice of relational AMIs on Amazon EC2 and EBS
Answer: C
Explanation:
Amazon Redshift is a fast, fully managed, petabyte-scale data warehouse service that makes it simple and cost-effective to efficiently analyze all your data using your existing business intelligence tools. You can start small for just $0.25 per hour with no commitments or upfront costs and scale to a petabyte or more for $1,000 per terabyte per year, less than a tenth of most other data warehousing solutions. Amazon Redshift delivers fast query performance by using columnar storage technology to improve I/O efficiency and parallelizing queries across multiple nodes. Redshift uses standard PostgreSQL JDBC and ODBC drivers, allowing you to use a wide range of familiar SQL clients. Data load speed scales linearly with cluster size, with integrations to Amazon S3, Amazon DynamoDB, Amazon Elastic MapReduce, Amazon Kinesis or any SSH-enabled host.
Reference: https://aws.amazon.com/running_databases/#redshift_anchor