1.C explanation; Cloud consumers that use cloud-based IT resources can generally lease them with a pay-for-use model. With this model, cloud consumers pay a usage fee for only the amount of the IT resource actually used, resulting in directly proportional costs. This gives an organization access to IT resources without having to purchase its own, resulting in reduced investment requirements 2.B explanation The availability of an IT resource is the probability that it will be accessible. The probability value is generally expressed with a percentage representing the amount of time that the IT resource is accessible during a given period. The percentage is calculated as follows: 1. Divide the amount of hours the IT resource was unavailable (within a measured period) by the total amount of hours within the measured period. 2. Multiply the value by 100. 3. Deduct the value from 100 3.D explanation; Horizontal scaling refers to the allocation or releasing of resources of the same type. The horizontal allocation of resources is referred to as scaling out and the horizontal releasing of resources is referred to as scaling in. Horizontal scaling is a common form of scaling within cloud environments 4.C explanation; Cloud-based IT resources that are used by a cloud consumer reside outside of the cloud consumer’s organizational boundary. To use the IT resources, the cloud consumer will generally need to trust them. As a result, the cloud consumer’s trust boundary is expanded beyond its organizational boundary to encompass the cloud. 5.C explanation; An organization will often have existing IT resources that are already paid for and operational. The prior investment that has been made in these on-premise IT resources is referred to as sunk costs. When comparing cloud-based IT resources to on-premise IT resources with sunk costs, the up-front costs for on-premise IT resources is significantly lower. It can therefore be more difficult to justify the leasing of cloud- based IT resources as an alternative 6.D explanation the fact that trust boundaries overlap can lead to opportunities for an attacker to attack IT resources shared by multiple cloud consumers 7.D explanation all r correct 8.B explanation Cloud A provides Cloud Service A as part of a failover system that encompasses a redundant implementation of Cloud Service A on Cloud B. If Cloud Service A on Cloud A fails, then Cloud Service A on Cloud B is automatically provisioned transparently to Cloud Service Consumer A. Each cloud has a specific level of reliability and availability that it guarantees for Cloud Service A. By spanning the failover system across both clouds, the overall reliability and availability will be higher than the maximum reliability and availability of either cloud 9.C explanation Different physical and virtual IT resources are dynamically assigned and reassigned according to cloud consumer demand, typically followed by execution through statistical multiplexing. Resource poolin.

1. 1.C
explanation; Cloud consumers that use cloud-based IT resources can generally lease them with a
pay-for-use model. With this model, cloud consumers pay a usage fee for only the amount of the
IT resource actually used, resulting in directly proportional costs. This gives an organization
access to IT resources without having to purchase its own, resulting in reduced investment
requirements
2.B
explanation
The availability of an IT resource is the probability that it will be accessible. The probability
value is generally expressed with a percentage representing the amount of time that the IT
resource is accessible during a given period. The percentage is calculated as follows: 1. Divide
the amount of hours the IT resource was unavailable (within a measured period) by the total
amount of hours within the measured period. 2. Multiply the value by 100. 3. Deduct the value
from 100
3.D
explanation;
Horizontal scaling refers to the allocation or releasing of resources of the same type. The
horizontal allocation of resources is referred to as scaling out and the horizontal releasing of
resources is referred to as scaling in. Horizontal scaling is a common form of scaling within
cloud environments
4.C
explanation;
Cloud-based IT resources that are used by a cloud consumer reside outside of the cloud
consumer’s organizational boundary. To use the IT resources, the cloud consumer will generally
need to trust them. As a result, the cloud consumer’s trust boundary is expanded beyond its
organizational boundary to encompass the cloud.
5.C
explanation;
An organization will often have existing IT resources that are already paid for and operational.
The prior investment that has been made in these on-premise IT resources is referred to as sunk
costs. When comparing cloud-based IT resources to on-premise IT resources with sunk costs,
the up-front costs for on-premise IT resources is significantly lower. It can therefore be more
difficult to justify the leasing of cloud- based IT resources as an alternative
6.D
explanation

2. the fact that trust boundaries overlap can lead to opportunities for an attacker to attack IT
resources shared by multiple cloud consumers
7.D
explanation
all r correct
8.B
explanation
Cloud A provides Cloud Service A as part of a failover system that encompasses a redundant
implementation of Cloud Service A on Cloud B. If Cloud Service A on Cloud A fails, then
Cloud Service A on Cloud B is automatically provisioned transparently to Cloud Service
Consumer A. Each cloud has a specific level of reliability and availability that it guarantees for
Cloud Service A. By spanning the failover system across both clouds, the overall reliability and
availability will be higher than the maximum reliability and availability of either cloud
9.C
explanation
Different physical and virtual IT resources are dynamically assigned and reassigned according to
cloud consumer demand, typically followed by execution through statistical multiplexing.
Resource pooling is commonly achieved through multitenancy technology, and therefore
encompassed by this multitenancy characteristic.
10.B
explanation
Cloud-based environments rely heavily on the use of system-level and custom service agents to
perform much of the runtime monitoring and measuring required to ensure that features, such as
elastic scaling and pay-for-use billing, can be carried out instantaneously.
11.C,D
explanation
Workload Prioritization – workloads are scheduled, queued, discarded, and distributed
workloads according to their priority levels
12.c
explanation
Cloud computing emerged from a combination of business drivers and technology innovations.
Business drivers: Capacity Planning Cost reduction and Operating Overhead Organizational
Agility Technology Innovations: Grid Computing Technology Clustering Technology
Virtualization Technology
13.C
14.A

3. 15.c
16.b
17.
Solution
1.C
explanation; Cloud consumers that use cloud-based IT resources can generally lease them with a
pay-for-use model. With this model, cloud consumers pay a usage fee for only the amount of the
IT resource actually used, resulting in directly proportional costs. This gives an organization
access to IT resources without having to purchase its own, resulting in reduced investment
requirements
2.B
explanation
The availability of an IT resource is the probability that it will be accessible. The probability
value is generally expressed with a percentage representing the amount of time that the IT
resource is accessible during a given period. The percentage is calculated as follows: 1. Divide
the amount of hours the IT resource was unavailable (within a measured period) by the total
amount of hours within the measured period. 2. Multiply the value by 100. 3. Deduct the value
from 100
3.D
explanation;
Horizontal scaling refers to the allocation or releasing of resources of the same type. The
horizontal allocation of resources is referred to as scaling out and the horizontal releasing of
resources is referred to as scaling in. Horizontal scaling is a common form of scaling within
cloud environments
4.C
explanation;
Cloud-based IT resources that are used by a cloud consumer reside outside of the cloud
consumer’s organizational boundary. To use the IT resources, the cloud consumer will generally
need to trust them. As a result, the cloud consumer’s trust boundary is expanded beyond its
organizational boundary to encompass the cloud.
5.C
explanation;
An organization will often have existing IT resources that are already paid for and operational.
The prior investment that has been made in these on-premise IT resources is referred to as sunk

4. costs. When comparing cloud-based IT resources to on-premise IT resources with sunk costs,
the up-front costs for on-premise IT resources is significantly lower. It can therefore be more
difficult to justify the leasing of cloud- based IT resources as an alternative
6.D
explanation
the fact that trust boundaries overlap can lead to opportunities for an attacker to attack IT
resources shared by multiple cloud consumers
7.D
explanation
all r correct
8.B
explanation
Cloud A provides Cloud Service A as part of a failover system that encompasses a redundant
implementation of Cloud Service A on Cloud B. If Cloud Service A on Cloud A fails, then
Cloud Service A on Cloud B is automatically provisioned transparently to Cloud Service
Consumer A. Each cloud has a specific level of reliability and availability that it guarantees for
Cloud Service A. By spanning the failover system across both clouds, the overall reliability and
availability will be higher than the maximum reliability and availability of either cloud
9.C
explanation
Different physical and virtual IT resources are dynamically assigned and reassigned according to
cloud consumer demand, typically followed by execution through statistical multiplexing.
Resource pooling is commonly achieved through multitenancy technology, and therefore
encompassed by this multitenancy characteristic.
10.B
explanation
Cloud-based environments rely heavily on the use of system-level and custom service agents to
perform much of the runtime monitoring and measuring required to ensure that features, such as
elastic scaling and pay-for-use billing, can be carried out instantaneously.
11.C,D
explanation
Workload Prioritization – workloads are scheduled, queued, discarded, and distributed
workloads according to their priority levels
12.c
explanation
Cloud computing emerged from a combination of business drivers and technology innovations.

5. Business drivers: Capacity Planning Cost reduction and Operating Overhead Organizational
Agility Technology Innovations: Grid Computing Technology Clustering Technology
Virtualization Technology
13.C
14.A
15.c
16.b
17.