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Q1. Please select the Amazon EC2 resource which cannot be tagged.
A. images (AM|s, kernels, RAM disks)
B. Amazon EBS volumes
C. Elastic IP addresses
D. VPCs
Answer: C
Q2. An application hosted at the EC2 instance receives an HTTP request from ELB. The same request has an X-Forvvarded-For header, which has three IP addresses. Which system's IP will be a part of this header?
A. Previous Request IP address.
B. Client IP address.
C. All of the answers listed here.
D. Load Balancer IP address.
Answer: C
Explanation:
When a user sends a request to ELB over HTTP/HTTPS, the request header log at the instance will only receive the IP of ELB. This is because ELB is the interceptor between the EC2 instance and the client request. To get the client IP, use the header X-Forvvarded-For in header. The client IP address in the
X-Fonzvarded-For request header is followed by the IP addresses of each successive proxy that passes along the request. The last IP address is the IP address that connects to the back-end application instance. e.g. if the HTTP request already has a header when it reaches the Load Balancer, the IP address from which the request came is appended at the end of the header followed by the IP address of the Load Balancer. In such cases, the X-Forvvarded-For request header takes the following form:
X-Fonzvarded-For: cIientIPAddress, previousRequestIPAddress, LoadBaIancerIPAddress. Reference:
http://docs.aws.amazon.com/E|asticLoadBaIancing/Iatest/DeveIoperGuide/TerminologyandKeyConcepts. html
Q3. What is the network performance offered by the c4.8xIarge instance in Amazon EC2?
A. 20 Gigabit
B. 10 Gigabit
C. Very High but variable
D. 5 Gigabit
Answer: B
Explanation:
Networking performance offered by the c4.8xIarge instance is 10 Gigabit. Reference: http://aws.amazon.com/ec2/instance-types/
Q4. A user is running a batch process which runs for 1 hour every day. Which of the below mentioned options is the right instance type and costing model in this case if the user performs the same task for the whole year?
A. EBS backed instance with on-demand instance pricing.
B. EBS backed instance with heavy utilized reserved instance pricing.
C. EBS backed instance with low utilized reserved instance pricing.
D. Instance store backed instance with spot instance pricing.
Answer: A
Explanation:
For Amazon Web Services, the reserved instance helps the user save money if the user is going to run the same instance for a longer period. Generally if the user uses the instances around 30-40% annually it is recommended to use RI. Here as the instance runs only for 1 hour daily it is not recommended to have RI as it will be costlier. The user should use on-demand with EBS in this case.
Reference: http://aws.amazon.com/ec2/purchasing-options/reserved-instances/
Q5. You have set up an Elastic Load Balancer (ELB) with the usual default settings, which route each request independently to the application instance with the smallest load. However, someone has asked you to bind a user's session to a specific application instance so as to ensure that all requests coming from the user during the session will be sent to the same application instance. AWS has a feature to do this. What is it called?
A. Connection draining
B. Proxy protocol
C. Tagging
D. Sticky session
Answer: D
Explanation:
An Elastic Load BaIancer(ELB) by default, routes each request independently to the application instance
with the smallest load. However, you can use the sticky session feature (also known as session affinity), which enables the load balancer to bind a user's session to a specific application instance. This ensures that all requests coming from the user during the session will be sent to the same application instance. The key to managing the sticky session is determining how long your load balancer should consistently route the user's request to the same application instance. If your application has its own session cookie, then you can set Elastic Load Balancing to create the session cookie to follow the duration specified by the appIication's session cookie. If your application does not have its own session cookie, then you can set Elastic Load Balancing to create a session cookie by specifying your own stickiness duration. You can associate stickiness duration for only HTTP/HTTPS load balancer listeners.
An application instance must always receive and send two cookies: A cookie that defines the stickiness duration and a special Elastic Load Balancing cookie named AWSELB, that has the mapping to the application instance.
Reference: http://docs.aws.amazon.com/E|asticLoadBaIancing/latest/DeveIoperGuide/TerminoIogyandKeyConcepts. htmI#session-stickiness
Q6. Can a user get a notification of each instance start / terminate configured with Auto Scaling?
A. Yes, if configured with the Launch Config
B. Yes, always
C. Yes, if configured with the Auto Scaling group
D. No
Answer: C
Explanation:
The user can get notifications using SNS if he has configured the notifications while creating the Auto Scaling group.
Reference: http://docs.aws.amazon.com/AutoScaIing/latest/DeveIoperGuide/GettingStartedTutoriaI.html
Q7. A web company is looking to implement an external payment service into their highly available application deployed in a VPC Their application EC2 instances are behind a public lacing ELB Auto scaling is used to add additional instances as traffic increases under normal load the application runs 2 instances in the
Auto Scaling group but at peak it can scale 3x in size. The application instances need to communicate with the payment service over the Internet which requires whitelisting of all public IP addresses used to communicate with it. A maximum of 4 whitelisting IP addresses are allowed at a time and can be added through an API.
How should they architect their solution?
A. Route payment requests through two NAT instances setup for High Availability and whitelist the Elastic IP addresses attached to the MAT instances.
B. Whitelist the VPC Internet Gateway Public IP and route payment requests through the Internet Gateway.
C. Whitelist the ELB IP addresses and route payment requests from the Application servers through the ELB.
D. Automatically assign public IP addresses to the application instances in the Auto Scaling group and run a script on boot that adds each instances public IP address to the payment validation whitelist API.
Answer: D
Q8. Which one of the following can't be used as an origin server with Amazon CIoudFront?
A. A web server running in your infrastructure
B. Amazon S3
C. Amazon Glacier
D. A web server running on Amazon EC2 instances
Answer: C
Explanation:
Amazon CIoudFront is designed to work with Amazon S3 as your origin server, customers can also use Amazon C|oudFront with origin sewers running on Amazon EC2 instances or with any other custom origin.
Reference: http://docs.aws.amazon.com/AmazonCIoudFront/latest/DeveIoperGuide/distribution-web.html
Q9. Using Amazon IAM, can I give permission based on organizational groups?
A. Yes but only in certain cases
B. No
C. Yes always
Answer: C
Q10. You have recently joined a startup company building sensors to measure street noise and air quality in urban areas. The company has been running a pilot deployment of around 100 sensors for 3 months each sensor uploads 1KB of sensor data every minute to a backend hosted on AWS.
During the pilot, you measured a peak or 10 IOPS on the database, and you stored an average of 3GB of sensor data per month in the database.
The current deployment consists of a load-balanced auto scaled Ingestion layer using EC2 instances and a PostgreSQL RDS database with 500GB standard storage.
The pilot is considered a success and your CEO has managed to get the attention or some potential investors. The business plan requires a deployment of at least IOOK sensors which needs to be supported by the backend. You also need to store sensor data for at least two years to be able to compare year over year Improvements.
To secure funding, you have to make sure that the platform meets these requirements and leaves room for further scaling. Which setup win meet the requirements?
A. Add an SQS queue to the ingestion layer to buffer writes to the RDS instance
B. Ingest data into a DynamoDB table and move old data to a Redshift cluster
C. Replace the RDS instance with a 6 node Redshift cluster with 96TB of storage
D. Keep the current architecture but upgrade RDS storage to 3TB and IOK provisioned IOPS
Answer: C
Q11. Which of the below mentioned options is not available when an instance is launched by Auto Scaling with EC2 Classic?
A. Public IP
B. Elastic IP
C. Private DNS
D. Private IP
Answer: B
Explanation:
Auto Scaling supports both EC2 classic and EC2-VPC. When an instance is launched as a part of EC2 classic, it will have the public IP and DNS as well as the private IP and DNS.
Reference: http://docs.aws.amazon.com/AutoScaIing/latest/DeveIoperGuide/GettingStartedTutoriaI.html
Q12. Making your snapshot public shares all snapshot data with everyone. Can the snapshots with AWS Market place product codes be made public?
A. No
B. Yes
Answer: B
Q13. If an Amazon EBS volume is the root device of an instance, can I detach it without stopping the instance?
A. Yes but only if Windows instance
B. No
C. Yes
D. Yes but only if a Linux instance
Answer: B
Q14. Does Amazon RDS allow direct host access via Telnet, Secure Shell (SSH), or Windows Remote Desktop Connection?
A. Yes
B. No
C. Depends on if it is in VPC or not
Answer: B
Q15. Which DNS name can only be resolved within Amazon EC2?
A. Public DNS name
B. Internal DNS name
C. External DNS name
D. Global DNS name
Answer: B
Explanation:
Only Internal DNS name can be resolved within Amazon EC2. Reference:
http://docs.amazonwebservices.com/AWSEC2/latest/UserGuide/using-instance-addressing.htmI