AWS-SysOps Exam
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Q131. - (Topic 3)
A user has configured ELB with a TCP listener at ELB as well as on the back-end instances. The user wants to enable a proxy protocol to capture the source and destination IP information in the header. Which of the below mentioned statements helps the user understand a proxy protocol with TCP configuration?
A. If the end user is requesting behind a proxy server then the user should not enable a proxy protocol on ELB
B. ELB does not support a proxy protocol when it is listening on both the load balancer and the back-end instances
C. Whether the end user is requesting from a proxy server or directly, it does not make a difference for the proxy protocol
D. If the end user is requesting behind the proxy then the user should add the “isproxy” flag to the ELB Configuration
Answer: A
Explanation:
When the user has configured Transmission Control Protocol (TCP. or Secure Sockets Layer (SSL. for both front-end and back-end connections of the Elastic Load Balancer, the load balancer forwards the request to the back-end instances without modifying the request headers unless the proxy header is enabled. If the end user is requesting from a Proxy Protocol enabled proxy server, then the ELB admin should not enable the Proxy Protocol on the load balancer. If the Proxy Protocol is enabled on both the proxy server and the load balancer, the load balancer will add another header to the request which already has a header from the proxy server. This duplication may result in errors.
Q132. - (Topic 2)
A user is planning to evaluate AWS for their internal use. The user does not want to incur any charge on his account during the evaluation. Which of the below mentioned AWS services would incur a charge if used?
A. AWS S3 with 1 GB of storage
B. AWS micro instance running 24 hours daily
C. AWS ELB running 24 hours a day
D. AWS PIOPS volume of 10 GB size
Answer: D
Explanation:
AWS is introducing a free usage tier for one year to help the new AWS customers get started in Cloud. The free tier can be used for anything that the user wants to run in the Cloud. AWS offers a handful of AWS services as a part of this which includes 750 hours of free micro instances and 750 hours of ELB. It includes the AWS S3 of 5 GB and AWS EBS general purpose volume upto 30 GB. PIOPS is not part of free usage tier.
Q133. - (Topic 2)
A user is running one instance for only 3 hours every day. The user wants to save some cost with the instance. Which of the below mentioned Reserved Instance categories is advised in this case?
A. The user should not use RI; instead only go with the on-demand pricing
B. The user should use the AWS high utilized RI
C. The user should use the AWS medium utilized RI
D. The user should use the AWS low utilized RI
Answer: A
Explanation:
The AWS Reserved Instance provides the user with an option to save some money by paying a one-time fixed amount and then save on the hourly rate. It is advisable that if the user is having 30% or more usage of an instance per day, he should go for a RI. If the user is going to use an EC2 instance for more than 2200-2500 hours per year, RI will help the user save some cost. Here, the instance is not going to run for less than 1500 hours. Thus, it is advisable that the user should use the on-demand pricing.
Q134. - (Topic 3)
An organization has configured Auto Scaling with ELB. There is a memory issue in the application which is causing CPU utilization to go above 90%. The higher CPU usage triggers an event for Auto Scaling as per the scaling policy. If the user wants to find the root cause inside the application without triggering a scaling activity, how can he achieve this?
A. Stop the scaling process until research is completed
B. It is not possible to find the root cause from that instance without triggering scaling
C. Delete Auto Scaling until research is completed
D. Suspend the scaling process until research is completed
Answer: D
Explanation:
Auto Scaling allows the user to suspend and then resume one or more of the Auto Scaling processes in the Auto Scaling group. This is very useful when the user wants to investigate a configuration problem or some other issue, such as a memory leak with the web application and then make changes to the application, without triggering the Auto Scaling process.
Q135. - (Topic 2)
A user has developed an application which is required to send the data to a NoSQL database. The user wants to decouple the data sending such that the application keeps processing and sending data but does not wait for an acknowledgement of DB. Which of the below mentioned applications helps in this scenario?
A. AWS Simple Notification Service
B. AWS Simple Workflow
C. AWS Simple Queue Service
D. AWS Simple Query Service
Answer: C
Explanation:
Amazon Simple Queue Service (SQS. is a fast, reliable, scalable, and fully managed message queuing service. SQS provides a simple and cost-effective way to decouple the components of an application. In this case, the user can use AWS SQS to send messages which are received from an application and sent to DB. The application can continue processing data without waiting for any acknowledgement from DB. The user can use SQS to transmit any volume of data without losing messages or requiring other services to always be available.
Q136. - (Topic 1)
You are attempting to connect to an instance in Amazon VPC without success You have already verified that the VPC has an Internet Gateway (IGW) the instance has an associated Elastic IP (EIP) and correct security group rules are in place.
Which VPC component should you evaluate next?
A. The configuration of a NAT instance
B. The configuration of the Routing Table
C. The configuration of the internet Gateway (IGW)
D. The configuration of SRC/DST checking
Answer: B
Explanation: Reference:
http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/UserScenariosF orVPC.html
Q137. - (Topic 3)
A user is observing the EC2 CPU utilization metric on CloudWatch. The user has observed some interesting patterns while filtering over the 1 week period for a particular hour. The user wants to zoom that data point to a more granular period. How can the user do that easily with CloudWatch?
A. The user can zoom a particular period by selecting that period with the mouse and then releasing the mouse
B. The user can zoom a particular period by double clicking on that period with the mouse
C. The user can zoom a particular period by specifying the aggregation data for that period
D. The user can zoom a particular period by specifying the period in the Time Range
Answer: A
Q138. - (Topic 1)
You have started a new job and are reviewing your company's infrastructure on AWS You notice one web application where they have an Elastic Load Balancer (&B) in front of web instances in an Auto Scaling Group When you check the metrics for the ELB in CloudWatch you see four healthy instances In Availability Zone (AZ) A and zero in AZ B There are zero unhealthy instances.
What do you need to fix to balance the instances across AZs?
A. Set the ELB to only be attached to another AZ
B. Make sure Auto Scaling is configured to launch in both AZs
C. Make sure your AMI is available in both AZs
D. Make sure the maximum size of the Auto Scaling Group is greater than 4
Answer: B
Q139. - (Topic 3)
A user has a weighing plant. The user measures the weight of some goods every 5 minutes and sends data to AWS CloudWatch for monitoring and tracking. Which of the below mentioned parameters is mandatory for the user to include in the request list?
A. Value
B. Namespace
C. Metric Name
D. Timezone
Answer: B
Explanation:
AWS CloudWatch supports the custom metrics. The user can always capture the custom data and upload the data to CloudWatch using CLI or APIs. The user can publish the data to CloudWatch as single data points or as an aggregated set of data points called a statistic set. The user has to always include the namespace as part of the request. The user can supply a file instead of the metric name. If the user does not supply the timezone, it accepts the current time. If the user is sending the data as a single data point it will have parameters, such as value. However, if the user is sending as an aggregate it will have parameters, such as statistic-values.
Q140. - (Topic 3)
A user has created a VPC with the public and private subnets using the VPC wizard. The VPC has CIDR
20.0.0.0/16. The public subnet uses CIDR 20.0.1.0/24. The user is planning to host a web server in the public subnet (port 80. and a DB server in the private subnet (port 3306.. The user is configuring a security group for the public subnet (WebSecGrp. and the private subnet (DBSecGrp.. Which of the below mentioned entries is required in the private subnet database security group (DBSecGrp.?
A. Allow Inbound on port 3306 for Source Web Server Security Group (WebSecGrp.
B. Allow Inbound on port 3306 from source 20.0.0.0/16
C. Allow Outbound on port 3306 for Destination Web Server Security Group (WebSecGrp.
D. Allow Outbound on port 80 for Destination NAT Instance IP
Answer: A
Explanation:
A user can create a subnet with VPC and launch instances inside that subnet. If the user has created a public private subnet to host the web server and DB server respectively, the user should configure that the instances in the private subnet can receive inbound traffic from the public subnet on the DB port. Thus, configure port 3306 in Inbound with the source as the Web Server Security Group (WebSecGrp.. The user should configure ports 80 and 443 for Destination 0.0.0.0/0 as the route table directs traffic to the NAT instance from the private subnet.