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Q31. – (Topic 3) 

A system admin is planning to encrypt all objects being uploaded to S3 from an application. The system admin does not want to implement his own encryption algorithm; instead he is planning to use server side encryption by supplying his own key (SSE-C.. Which parameter is not required while making a call for SSE-C? 

A. x-amz-server-side-encryption-customer-key-AES-256 

B. x-amz-server-side-encryption-customer-key 

C. x-amz-server-side-encryption-customer-algorithm 

D. x-amz-server-side-encryption-customer-key-MD5 

Answer:

Explanation: 

AWS S3 supports client side or server side encryption to encrypt all data at rest. The server side encryption can either have the S3 supplied AES-256 encryption key or the user can send the key along with each API call to supply his own encryption key (SSE-C.. When the user is supplying his own encryption key, the user has to send the below mentioned parameters as a part of the API calls: x-amz-server-side-encryption-customer-algorithm: Specifies the encryption algorithm x-amz-server-side-encryption-customer-key: To provide the base64-encoded encryption key x-amz-server-side-encryption-customer-key-MD5: To provide the base64-encoded 128-bit MD5 digest of the encryption key 

Q32. – (Topic 3) 

A root account owner has given full access of his S3 bucket to one of the IAM users using the bucket ACL. When the IAM user logs in to the S3 console, which actions can he perform? 

A. He can just view the content of the bucket 

B. He can do all the operations on the bucket 

C. It is not possible to give access to an IAM user using ACL 

D. The IAM user can perform all operations on the bucket using only API/SDK 

Answer:

Explanation: 

Each AWS S3 bucket and object has an ACL (Access Control List. associated with it. An ACL is a list of grants identifying the grantee and the permission granted. The user can use ACLs to grant basic read/write permissions to other AWS accounts. ACLs use an Amazon S3–specific XML schema. The user cannot grant permissions to other users (IAM users. in his account. 

Q33. – (Topic 3) 

A user has launched an EC2 instance from an instance store backed AMI. If the user restarts the instance, what will happen to the ephermal storage data? 

A. All the data will be erased but the ephermal storage will stay connected 

B. All data will be erased and the ephermal storage is released 

C. It is not possible to restart an instance launched from an instance store backed AMI 

D. The data is preserved 

Answer:

Explanation: 

A user can reboot an EC2 instance using the AWS console, the Amazon EC2 CLI or the Amazon EC2 API. Rebooting an instance is equivalent to rebooting an operating system. However, it is recommended that the user use Amazon EC2 to reboot the instance instead of running the operating system reboot command from the instance. When an instance launched from an instance store backed AMI is rebooted all the ephermal storage data is still preserved. 

Q34. – (Topic 3) 

George has shared an EC2 AMI created in the US East region from his AWS account with Stefano. George copies the same AMI to the US West region. Can Stefano access the copied AMI of George’s account from the US West region? 

A. No, copy AMI does not copy the permission 

B. It is not possible to share the AMI with a specific account 

C. Yes, since copy AMI copies all private account sharing permissions 

D. Yes, since copy AMI copies all the permissions attached with the AMI 

Answer:

Explanation: 

Within EC2, when the user copies an AMI, the new AMI is fully independent of the source AMI; there is no link to the original (source. AMI. AWS does not copy launch the permissions, user-defined tags or the Amazon S3 bucket permissions from the source AMI to the new AMI. Thus, in this case by default Stefano will not have access to the AMI in the US West region. 

Q35. – (Topic 3) 

A user is trying to create a PIOPS EBS volume with 4000 IOPS and 100 GB size. AWS does not allow the user to create this volume. What is the possible root cause for this? 

A. The ratio between IOPS and the EBS volume is higher than 30 

B. The maximum IOPS supported by EBS is 3000 

C. The ratio between IOPS and the EBS volume is lower than 50 

D. PIOPS is supported for EBS higher than 500 GB size 

Answer:

Explanation: 

A provisioned IOPS EBS volume can range in size from 10 GB to 1 TB and the user can provision up to 4000 IOPS per volume. The ratio of IOPS provisioned to the volume size requested should be a maximum of 30; for example, a volume with 3000 IOPS must be at least 100 GB. 

Q36. – (Topic 2) 

A user has launched an EBS backed EC2 instance. What will be the difference while performing the restart or stop/start options on that instance? 

A. For restart it does not charge for an extra hour, while every stop/start it will be charged as a separate hour 

B. Every restart is charged by AWS as a separate hour, while multiple start/stop actions during a single hour will be counted as a single hour 

C. For every restart or start/stop it will be charged as a separate hour 

D. For restart it charges extra only once, while for every stop/start it will be charged as a separate hour 

Answer:

Explanation: 

For an EC2 instance launched with an EBS backed AMI, each time the instance state is changed from stop to start/ running, AWS charges a full instance hour, even if these transitions happen multiple times within a single hour. Anyway, rebooting an instance AWS does not charge a new instance billing hour. 

Topic 3, Volume C 

154. – (Topic 3) 

A user has created a VPC with a public subnet. The user has terminated all the instances which are part of the subnet. Which of the below mentioned statements is true with respect to this scenario? 

A. The user cannot delete the VPC since the subnet is not deleted 

B. All network interface attached with the instances will be deleted 

C. When the user launches a new instance it cannot use the same subnet 

D. The subnet to which the instances were launched with will be deleted 

Answer:

Explanation: 

A Virtual Private Cloud (VPC. is a virtual network dedicated to the user’s AWS account. A user can create a subnet with VPC and launch instances inside that subnet. When an instance is launched it will have a network interface attached with it. The user cannot delete the subnet until he terminates the instance and deletes the network interface. When the user terminates the instance all the network interfaces attached with it are also deleted. 

Q37. – (Topic 2) 

A root account owner has created an S3 bucket testmycloud. The account owner wants to allow everyone to upload the objects as well as enforce that the person who uploaded the object should manage the permission of those objects. Which is the easiest way to achieve this? 

A. The root account owner should create a bucket policy which allows the IAM users to upload the object 

B. The root account owner should create the bucket policy which allows the other account owners to set the object policy of that bucket 

C. The root account should use ACL with the bucket to allow everyone to upload the object 

D. The root account should create the IAM users and provide them the permission to upload content to the bucket 

Answer:

Explanation: 

Each AWS S3 bucket and object has an ACL (Access Control List. associated with it. An ACL is a list of grants identifying the grantee and the permission granted. The user can use ACLs to grant basic read/write permissions to other AWS accounts. ACLs use an Amazon S3–specific XML schema. The user cannot grant permissions to other users in his account. ACLs are suitable for specific scenarios. For example, if a bucket owner allows other AWS accounts to upload objects, permissions to these objects can only be managed using the object ACL by the AWS account that owns the object. 

Q38. – (Topic 2) 

A user has launched a large EBS backed EC2 instance in the US-East-1a region. The user wants to achieve Disaster Recovery (DR. for that instance by creating another small instance in Europe. How can the user achieve DR? 

A. Copy the running instance using the “Instance Copy” command to the EU region 

B. Create an AMI of the instance and copy the AMI to the EU region. Then launch the instance from the EU AMI 

C. Copy the instance from the US East region to the EU region 

D. Use the “Launch more like this” option to copy the instance from one region to another 

Answer:

Explanation: 

To launch an EC2 instance it is required to have an AMI in that region. If the AMI is not available in that region, then create a new AMI or use the copy command to copy the AMI from one region to the other region. 

Q39. – (Topic 3) 

A user is using Cloudformation to launch an EC2 instance and then configure an application after the instance is launched. The user wants the stack creation of ELB and AutoScaling to wait until the EC2 instance is launched and configured properly. How can the user configure this? 

A. It is not possible that the stack creation will wait until one service is created and launched 

B. The user can use the HoldCondition resource to wait for the creation of the other dependent resources 

C. The user can use the DependentCondition resource to hold the creation of the other dependent resources 

D. The user can use the WaitCondition resource to hold the creation of the other dependent resources 

Answer:

Explanation: 

AWS Cloudformation is an application management tool which provides application modelling, deployment, configuration, management and related activities. AWS CloudFormation provides a WaitCondition resource which acts as a barrier and blocks the creation of other resources until a completion signal is received from an external source, such as a user application or management system. 

Q40. – (Topic 3) 

A user has configured an HTTPS listener on an ELB. The user has not configured any security policy which can help to negotiate SSL between the client and ELB. What will ELB do in this scenario? 

A. By default ELB will select the first version of the security policy 

B. By default ELB will select the latest version of the policy 

C. ELB creation will fail without a security policy 

D. It is not required to have a security policy since SSL is already installed 

Answer:

Explanation: 

Elastic Load Balancing uses a Secure Socket Layer (SSL. negotiation configuration which is known as a Security Policy. It is used to negotiate the SSL connections between a client and the load balancer. If the user has created an HTTPS/SSL listener without associating any security policy, Elastic Load Balancing will, bydefault, associate the latest version of the ELBSecurityPolicy-YYYY-MM with the load balancer. 

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