DEA-1TT5 Associate - Information Storage and Management (Version 5.0) Questions and Answers

Gateways are an essential component of an IoT architecture, providing the connection between user devices and the network. Gateways act as a bridge between the device layer and the cloud layer, enabling the remote monitoring and control of user devices. Gateways also provide security features such as data encryption and authentication, which helps protect user data. Additionally, gateways provide additional features, such as data aggregation and protocol conversion, which can help increase the efficiency of the overall IoT architecture.

A hypervisor is a layer of software that runs directly on top of a physical server and provides a virtualization layer. It allows multiple virtual machines (VMs) to run on the same physical hardware, sharing the underlying resources such as CPU, memory, and storage. The hypervisor isolates the VMs from each other and provides a virtual machine monitor (VMM) that manages the virtual machines' access to physical resources. The VMM is responsible for managing the VMs' creation, configuration, and removal, as well as their access to the physical resources of the host system. T

To calculate MTTR, we need to convert the hours into minutes. Here are the steps:

• Monday: Port 7 was down from 4 PM to 11 PM. That’s 7 hours or 420 minutes.
• Wednesday: Port 7 was down from 2 PM to 10 PM. That’s 8 hours or 480 minutes.
• Friday: Port 7 was down from 5 AM to11 AM. That’s 6 hours or 360 minutes.
• Total corrective maintenance time = 420 + 480 + 360 = 1260 minutes
• Number of repairs = 3
• MTTR = Total corrective maintenance time / Number of repairs
• MTTR = 1260 / 3 = 420 minutes

Therefore, the MTTR of Port 7 is 420 minutes.

Cyber recovery is a process of restoring critical data and systems in the event of a cyber attack. This goal of this process is to ensure that a copy of the data is always available, even if the original data has been corrupted or compromised. This can be done by isolating a copy of the data and keeping it separate from the original. This ensures that the data is always available should a cyber attack occur, allowing the business to quickly restore the original data and continue operations.

According to 1, vulnerabilities are weaknesses that can be exploited by attackers to compromise the confidentiality, integrity, or availability of data or systems. Vulnerabilities can exist at various levels of a data center environment, such as applications, operating systems, networks, devices, and physical infrastructure.

One of the ways to manage vulnerabilities in a data center environment is to minimize the attack surfaces and maximize the work factors1. This means that you should reduce the number of entry points and exposure areas that an attacker can exploit (attack surfaces) and increase the amount of effort and resources that an attacker needs to overcome your defenses (work factors). This can be achieved by applying various security measures such as patching, hardening, encryption, authentication, authorization, monitoring, auditing, and testing.

According to the web search results, I/O performance is a measure of how fast data can be transferred between a storage device and a host system1. It depends on various factors such as the type of storage device, the interface, the workload, and the response time12.

The four storage devices you mentioned are:

• SCM: Storage Class Memory, a type of persistent memory that can retain data even when power is lost. It can support both byte-level and block-level data access and has speeds nearly as fast as DRAM3.
• SSD: Solid State Drive, a type of flash-based storage device that uses NAND chips to store data. It has no moving parts and offers faster read/write speeds than HDDs. It can use different interfaces such as SATA or NVMe45.
• DRAM: Dynamic Random Access Memory, a type of volatile memory that loses data when power is lost. It is used as main memory in computers and offers very fast access speeds but consumes more power than SCM3.
• SATA: Serial ATA, an interface standard for connecting storage devices such as HDDs or SSDs to a host system. It offers lower bandwidth and performance than NVMe but is more widely compatible4.

the correct order of I/O performance from lowest to highest among these storage devices is B. SATA–> SSD–> SCM --> DRAM. This is because SATA has lower bandwidth than NVMe which most SSDs use; SSDs have lower latency than HDDs but higher latency than SCM; SCM has lower latency than SSDs but higher latency than DRAM; and DRAM has the lowest latency and highest bandwidth among them all.