MSP Bank, Limited is a leading Japanese monetary institution that provides a full range of financial products and services to both institutional and individual customers. It is headquartered in Tokyo. MSP Bank is hosting their existing infrastructure on premise.
MSP bank has lot of web applications, databases and data warehouse built on Teradata, NoSQL databases, and other types of data stores. MSP bank has lot of data assets in terms of logs, documents; excel files, CSV files, PDF documents and others. MSP Bank wants to provide seamless integration with data security features between their on-premises IT environment and the AWS storage infrastructure. MSP bank considers AWS Storage Gateway to address the integration.
MSP Bank is looking at gateway interface which provides cloud-backed storage volumes that you can mount as Internet Small Computer System Interface (iSCSI) devices from your on-premises application servers. Also store data in Amazon Simple Storage Service (Amazon S3) and retain a copy of frequently accessed data subsets locally thereby offer a substantial cost savings on primary storage and minimize the need to scale your storage on-premises. How can this be achieved? select 2 options.

Answer options:

A.Volume Gateway
B.Cached Volumes
C.Stored Volumes 
D.File Gateway

Answer: A,B
Option A is correct. A volume gateway provides cloud-backed storage volumes that you can mount as Internet Small Computer System Interface (iSCSI) devices from your on-premises application servers. The gateway supports the following volume configurations:
Cached volumes – You store your data in Amazon Simple Storage Service (Amazon S3) and retain a copy of frequently accessed data subsets locally. Cached volumes offer a substantial cost savings on primary storage and minimize the need to scale your storage on- premises. You also retainlow-latency access to your frequently accessed data.
Stored volumes – If you need low-latency access to your entire dataset, first configure your on-premises gateway to store all your data locally. Then asynchronously back up point-in- time snapshots of this data to Amazon S3. This configuration provides durable and inexpensive offsite backups that you can recover to your local data center or Amazon EC2. For example, if you need replacement capacity for disaster recovery, you can recover the backups to Amazon EC2.
https://docs.aws.amazon.com/storagegateway/latest/userguide/WhatIsStorageGateway.html
Option B is correct. Cached volumes – You store your data in Amazon Simple Storage Service (Amazon S3) and retain a copy of frequently accessed data subsets locally. Cached volumes offer a substantial cost savings on primary storage and minimize the need to scale your storage on- premises. You also retain low-latency access to your frequently accessed data.
https://docs.aws.amazon.com/storagegateway/latest/userguide/WhatIsStorageGateway.html
Option C is incorrect. Stored volumes – If you need low-latency access to your entire dataset, first configure your on-premises gateway to store all your data locally. Then asynchronously back up point-in- time snapshots of this data to Amazon S3. This configuration provides durable and inexpensive offsite backups that you can recover to your local data center or Amazon EC2. For example, if you need replacement capacity for disaster recovery, you can recover the backups to Amazon EC2
https://docs.aws.amazon.com/storagegateway/latest/userguide/WhatIsStorageGateway.html
Option D is incorrect. A file gateway supports a file interface into Amazon Simple Storage Service (Amazon S3) and combines a service and a virtual software appliance. By using this combination, store and retrieve objects in Amazon S3 using industry-standard file protocols such as Network File System (NFS) and Server Message Block (SMB). The software appliance, or gateway, is deployed into your on-premisesenvironment as a virtual machine (VM) running on VMware ESXi or Microsoft Hyper-V hypervisor. The gateway provides access to objects in S3 as files or file share mount points. With a file gateway, you can do the following:
You can store and retrieve files directly using the NFS version 3 or 4.1 protocol.
You can store and retrieve files directly using the SMB file system version, 2 and 3 protocol.
You can access your data directly in Amazon S3 from any AWS Cloud application or service.
You can manage your Amazon S3 data using lifecycle policies, cross-region replication, and versioning. You can think of a file gateway as a file system mount on S3.
https://docs.aws.amazon.com/storagegateway/latest/userguide/WhatIsStorageGateway.html