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Q281. Your company has an on-premises multi-tier PHP web application, which recently experienced downtime due to a large burst In web traffic due to a company announcement Over the coming days, you are expecting similar announcements to drive similar unpredictable bursts, and are looking to find ways to quickly improve your infrastructures ability to handle unexpected increases in traffic.
The application currently consists of 2 tiers a web tier which consists of a load balancer and several Linux Apache web servers as well as a database tier which hosts a Linux server hosting a MySQL database. Which scenario below will provide full site functionality, while helping to improve the ability of your application in the short timeframe required?
A. Failover environment: Create an 53 bucket and configure it for website hosting. Migrate your DNS to Route53 using zone file import, and leverage Route53 DNS failover to failover to the 53 hosted website.
B. Hybrid environment: Create an AMI, which can be used to launch web servers in EC2. Create an Auto Scaling group, which uses the AMI to scale the web tier based on incoming traffic. Leverage Elastic Load Balancing to balance traffic between on-premises web servers and those hosted In AWS.
C. Offload traffic from on-premises environment: Setup a C|oudFront distribution, and configure CIoudFront to cache objects from a custom origin. Choose to customize your object cache behavior, and select a TIL that objects should exist in cache.
D. Migrate to AWS: Use VM Import/Export to quickly convert an on-premises web server to an AMI. Create an Auto Scaling group, which uses the imported AMI to scale the web tier based on incoming traffic. Create an RDS read replica and setup replication between the RDS instance and on-premises MySQL server to migrate the database.
Answer: C
Q282. Amazon SWF is designed to help users
A. Design graphical user interface interactions
B. Manage user identification and authorization
C. Store Web content
D. Coordinate synchronous and asynchronous tasks which are distributed and fault tolerant.
Answer: D
Q283. You have just set up yourfirst Elastic Load Balancer (ELB) but it does not seem to be configured properly. You discover that before you start using ELB, you have to configure the listeners for your load balancer. Which protocols does ELB use to support the load balancing of applications?
A. HTTP and HTTPS
B. HTTP, HTTPS , TCP, SSL and SSH
C. HTTP, HTTPS , TCP, and SSL
D. HTTP, HTTPS , TCP, SSL and SFTP
Answer: C
Explanation:
Before you start using Elastic Load BaIancing(ELB), you have to configure the listeners for your load balancer. A listener is a process that listens for connection requests. It is configured with a protocol and a port number for front-end (client to load balancer) and back-end (load balancer to back-end instance) connections.
Elastic Load Balancing supports the load balancing of applications using HTTP, HTTPS (secure HTTP), TCP, and SSL (secure TCP) protocols. The HTTPS uses the SSL protocol to establish secure connections over the HTTP layer. You can also use SSL protocol to establish secure connections over the TCP layer.
The acceptable ports for both HTTPS/SSL and HTTP/TCP connections are 25, 80, 443, 465, 587, and
1024-65535.
Reference:
http://docs.aws.amazon.com/E|asticLoadBaIancing/latest/DeveIoperGuide/elb-listener-config.htmI
Q284. A customer has a 10 GB AWS Direct Connect connection to an AWS region where they have a web application hosted on Amazon Elastic Computer Cloud (EC2). The application has dependencies on an on-premises mainframe database that uses a BASE (Basic Available. Sort stale Eventual consistency) rather than an ACID (Atomicity. Consistency isolation. Durability) consistency model.
The application is exhibiting undesirable behavior because the database is not able to handle the volume of writes. How can you reduce the load on your on-premises database resources in the most
cost-effective way?
A. Use an Amazon Elastic Map Reduce (EMR) S3DistCp as a synchronization mechanism between the on-premises database and a Hadoop cluster on AWS.
B. Modify the application to write to an Amazon SQS queue and develop a worker process to flush the queue to the on-premises database.
C. Modify the application to use DynamoDB to feed an EMR cluster which uses a map function to write to the on-premises database.
D. Provision an RDS read-replica database on AWS to handle the writes and synchronize the two databases using Data Pipeline.
Answer: A
Explanation:
Reference: https://aws.amazon.com/blogs/aws/category/amazon-elastic-map-reduce/
Q285. While creating a network in the VPC, which of the following is true of a NAT device?
A. You have to administer the NAT Gateway Service provided by AWS.
B. You can choose to use any of the three kinds of NAT devices offered by AWS for special purposes.
C. You can use a NAT device to enable instances in a private subnet to connect to the Internet.
D. You are recommended to use AWS NAT instances over NAT gateways, as the instances provide better availability and bandwidth.
Answer: C
Explanation:
You can use a NAT device to enable instances in a private subnet to connect to the Internet (for example, for software updates) or other AWS services, but prevent the Internet from initiating connections with the instances. AWS offers two kinds of NAT devices u a NAT gateway or a NAT instance. We recommend NAT gateways, as they provide better availability and bandwidth over NAT instances. The NAT Gateway service is also a managed service that does not require your administration efforts. A NAT instance is launched from a NAT AM. You can choose to use a NAT instance for special purposes.
Reference: http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/vpc-nat.html
Q286. An AWS customer runs a public blogging website. The site users upload two million blog entries a month. The average blog entry size is 200 KB. The access rate to blog entries drops to negligible 6 months after publication and users rarely access a blog entry 1 year after publication. Additionally, blog entries have a high update rate during the first 3 months following publication, this drops to no updates after 6 months. The customer wants to use CIoudFront to improve his user's load times.
Which of the following recommendations would you make to the customer?
A. Duplicate entries into two different buckets and create two separate CIoudFront distributions where 53 access is restricted only to Cloud Front identity
B. Create a CIoudFront distribution with "US" Europe price class for US/ Europe users and a different CIoudFront distribution with AI I Edge Locations' for the remaining users.
C. Create a CIoudFront distribution with 53 access restricted only to the CIoudFront identity and partition the blog entry's location in 53 according to the month it was uploaded to be used with CIoudFront behaviors.
D. Create a CIoudFronI distribution with Restrict Viewer Access Forward Query string set to true and minimum TTL of 0.
Answer: C
Q287. How are the EBS snapshots saved on Amazon 53?
A. Exponentially
B. Incrementally
C. EBS snapshots are not stored in the Amazon 53
D. Decrementally
Answer: B
Q288. A read only news reporting site with a combined web and application tier and a database tier that receives large and unpredictable traffic demands must be able to respond to these traffic fluctuations automatically. What AWS services should be used meet these requirements?
A. Stateless instances for the web and application tier synchronized using Elasticache Memcached in an autoscaimg group monitored with CIoudWatch. And RDSwith read replicas.
B. Stateful instances for the web and application tier in an autoscaling group monitored with CIoudWatch and RDS with read replicas.
C. Stateful instances for the web and application tier in an autoscaling group monitored with CIoudWatch. And multi-AZ RDS.
D. Stateless instances for the web and application tier synchronized using EIastiCache Memcached in an autoscaling group monitored with CIoudWatch and multi-AZ RDS.
Answer: A
Q289. A company is building a voting system for a popular TV show, viewers win watch the performances then visit the show's website to vote for their favorite performer. It is expected that in a short period of time after the show has finished the site will receive millions of visitors. The visitors will first login to the site using their Amazon.com credentials and then submit their vote. After the voting is completed the page will display the vote totals. The company needs to build the site such that can handle the rapid influx of traffic while maintaining good performance but also wants to keep costs to a minimum. Which of the design patterns below should they use?
A. Use Cloud Front and an Elastic Load balancer in front of an auto-scaled set of web servers, the web servers will first can the Login With Amazon service to authenticate the user then process the users vote and store the result into a multi-AZ Relational Database Service instance.
B. Use CIoudFront and the static website hosting feature of 53 with the Javascript SDK to call the Login With Amazon service to authenticate the user, use IAM Roles to gain permissions to a DynamoDB table to store the users vote.
C. Use Cloud Front and an Elastic Load Balancer in front of an auto-scaled set of web servers, the web servers will first call the Login with Amazon service to authenticate the user, the web servers will process the users vote and store the result into a DynamoDB table using IAM Roles for EC2 instances to gain permissions to the DynamoDB table.
D. Use Cloud Front and an Elastic Load Balancer in front of an auto-scaled set of web servers, the web servers will first call the Login. With Amazon service to authenticate the user, the web sewers win process the users vote and store the result into an SQS queue using IAM Roles for EC2 Instances to gain permissions to the SQS queue. A set of application sewers will then retrieve the items from the queue and store the result into a DynamoDB table.
Answer: D
Q290. In regards to IAM you can edit user properties later, but you cannot use the console to change the
A. user name
B. password
C. default group
Answer: A