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Which concept focuses on operating highly available workloads in the cloud?
A. Security
B. Operational excellence
C. Reliability
D. Resource hierarchy
正解：C
解説：
Reliabilityin cloud design ensures workloads can recover quickly from disruptions and continue operating as expected. This concept focuses on high availability, fault tolerance, and disaster recovery. Reliability requires implementing redundancy, backup strategies, and robust monitoring.
Security ensures data protection, operational excellence covers continuous improvement, and resource hierarchy refers to organizational structures, but none focus specifically on availability and resilience.
By prioritizing reliability, organizations design cloud architectures capable of withstanding failures at multiple layers-compute, storage, networking, and even regions. This design principle ensures customer trust and compliance with service-level agreements.
質問 # 21
An organization is going through the process of selecting a new enterprise resource management (ERM) vendor. The organization has already selected the vendor and is now preparing to go through the onboarding process. Which specific issues should be discussed between the organization and the vendor during this phase?
A. Identifying the business need the vendor will address
B. Deciding how to respond to the request for proposal (RFP)
C. Ensuring the vendor has securely destroyed all confidential information
D. Verifying the details of the contract and arrangements for data transfer
正解：D
解説：
Once a vendor has been selected, the onboarding phase requirescontractual verification and technical arrangements for data transfer. This step ensures that service levels, compliance requirements, encryption standards, and responsibilities are clearly defined before operations begin.
Options such as identifying the business need or responding to the RFP are pre-selection activities. Ensuring secure destruction of data is relevant to offboarding, not onboarding. Therefore, the most critical onboarding task is verifying the contract details and ensuring secure data transfer agreements.
Discussing these issues protects the organization from legal disputes, ensures smooth technical integration, and supports compliance with frameworks such as GDPR and PCI DSS. It also defines the scope of vendor accountability in case of security incidents.
質問 # 22
A customer requests that a cloud provider physically destroys any drives storing their personal data. What must the provider do with the drives?
A. It should use cryptographic erasure to securely remove any personal data from the drives.
B. It should use degaussing tools to securely remove any personal data from the drives.
C. It should destroy them only if dedicated hardware disposal is specified in the contract.
D. It should destroy them only if the contract includes hardware disposal insurance.
正解：C
解説：
Cloud providers typically manage multi-tenant infrastructure, where physical hardware is shared among customers. Therefore, drives are not destroyed for each customer unless explicitly required in thecontract. If the customer's agreement specifies dedicated hardware disposal, then the provider must comply by physically destroying the drives.
Cryptographic erasure and degaussing are valid sanitization methods, but they may not meet the specific contractual requirement of physical destruction. Insurance clauses are unrelated to disposal.
This question underscores the importance of negotiating contractual terms in cloud agreements. Customers handling highly sensitive or regulated data may require physical destruction, while others may accept logical erasure. Clear agreements ensure both compliance and alignment of security responsibilities.
質問 # 23
Which cloud computing service model allows customers to run their own application code without configuring the server environment?
A. Software as a service (SaaS)
B. Data science as a service (DSaaS)
C. Platform as a service (PaaS)
D. Infrastructure as a service (IaaS)
正解：C
解説：
Platform as a Service (PaaS) allows customers to focus on writing and deploying code without managing the underlying infrastructure. The provider manages the operating system, runtime, and middleware, enabling faster development cycles and reduced administrative overhead.
IaaS would require the customer to configure servers and operating systems, SaaS provides ready-to-use applications, and DSaaS is a specialized category for analytics.
By abstracting the infrastructure, PaaS accelerates innovation and reduces operational burden but also limits flexibility in some cases. Security responsibilities under PaaS focus on application-level controls, while the provider handles infrastructure-level protections.
質問 # 24
Which data destruction technique involves encrypting the data, followed by encrypting the resulting keys with a different engine, and then destroying the keys resulting from the second encryption round?
A. One-way hashing
B. Degaussing
C. Overwriting
D. Cryptographic erasure
正解：D
解説：
Cryptographic erasure is a secure data sanitization technique that relies on encryption. The process involves encrypting the data, encrypting the keys with a second layer, and then destroying the encryption keys.
Without the keys, the encrypted data becomes unreadable and is effectively destroyed, even though the storage media remains intact.
One-way hashing is used for password storage, not full data destruction. Degaussing is for magnetic media, and overwriting involves physically writing new data over existing sectors.
Cryptographic erasure is widely used in cloud environments where physical media cannot be easily destroyed or reclaimed by customers. It ensures compliance with data retention and privacy regulations while maintaining environmental sustainability by allowing reuse of storage hardware.
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