What is the minimum number of disks required for RAID1?

What is the minimum number of disks required for RAID1?

• 2
• 1
• 4 or 5
• 3 

 

EXPLANATION

RAID 1 (mirroring) – the basic idea of such a solution is the replication (mirroring) of two or more discs. It means that while using RAID 1, an exact copy (or mirror) is created on two or more discs. Such a solution gives good read performance and reliability, but storage capacity must be compartmentalized. The reason for this is that the total storage must be equal to the capacity of the smallest disk. i.e.: in the case of an array composed of 3 discs – 250GM, 500GB and 1TB – the usable space will be equal to 250GB.

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Which encoding would allow you to transmit binary data over an ASCII-only communications channel?

Which encoding would allow you to transmit binary data over an ASCII-only communications channel?

• Unicode
• bytecode
• Base64
• ISO-8851-1 

 

EXPLANATION

Base64 is a format that encodes arbitrary binary data into ASCII characters (letters, digits and limited punctuation).  These characters then can be decoded back into binary at the other end.
  This allows transmitting binary data over channels that normally only allow ASCII (such as email or display terminals).  Base64 takes up 1/3 more space than the equivalent binary format.

SOURCE

https://en.wikipedia.org/wiki/Base64

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What is the maximum possible file size (to the nearest gigabyte) for a file on a FAT32 volume?

What is the maximum possible file size (to the nearest gigabyte) for a file on a FAT32 volume?

• 8GB
• 16GB
• 4GB
• 32GB 

EXPLANATION

The maximum possible size for a file on a FAT32 volume is 4 GB minus 1 byte or 4,294,967,295 (232 − 1) bytes. This limit is a consequence of the file length entry in the directory table and would also affect huge FAT16 partitions with a sufficient sector size.[1] Large video files, DVD images and databases easily exceed this limit.
https://en.wikipedia.org/wiki/File_Allocation_Table

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What is the minimum number of drives required by RAID 60?

What is the minimum number of drives required by RAID 60?

• 10
• 4
• 8
• 6 

 

EXPLANATION

RAID 60 requires a minimum of 8 drives, since it is 2 RAID 6 configurations (which each require 4 disks).

SOURCE

https://docs.oracle.com/cd/E19494-01/820-1260-15/appendixf.html#50548797_31043

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What is the disk fault tolerance in a minimally sized RAID 50 array?

What is the disk fault tolerance in a minimally sized RAID 50 array?

• 1 MAX
• 3 MAX
• NONE
• 2 MAX 

EXPLANATION

RAID 50, also called RAID 5+0, combines the straight block-level striping of RAID 0 with the distributed parity of RAID 5. As a RAID 0 array striped across RAID 5 elements, maximum fault tolerance is 1 in each RAID 5. Then the maximum fault tolerance is 2.

SOURCE

https://en.wikipedia.org/wiki/Nested_RAID_levels

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Which of these files will not fit in a 32GB flashdrive formatted as FAT32?

Which of these files will not fit in a 32GB flashdrive formatted as FAT32?

• 10 .msi files with 1000MB each
• All of them would fit just fine
• 3 .tar.gz files with 5GB each
• A .zip file with 1024MB 

 

EXPLANATION

Since your flash drive is formatted with the FAT32 file system, any file that is larger than 4GB will not be placed there. This type of a file system has a built-in limitation on the size of the files that it may contain. Although the total size of the files that you can copy to a FAT32 drive could be as large as 2TB (or the physical capacity of the drive, whichever is smaller), the size of each individual file may not exceed 4GB.

This limitation may sound silly: why would anyone design a system that would not allow for the larger files? The problem is, when the FAT32 file system was designed (that was back in the days of Windows 95), no one anticipated that we would have such large files in use today. Or, maybe the designers hoped that by the time such large files became common, the use of the FAT32 system would be replaced by more modern systems.

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Which of the following storage interconnect standards is network-routable?

Which of the following storage interconnect standards is network-routable?

• SAS
• iSCSI
• SCSI
• Fiber Channel 

EXPLANATION

From Techtarget.com:
iSCSI works by transporting block-level data between an iSCSI initiator on a server and an iSCSI target on a storage device. The iSCSI protocol encapsulates SCSI commands and assembles the data in packets for the TCP/IP layer. Packets are sent over the network using a point-to-point connection. Upon arrival, the iSCSI protocol disassembles the packets, separating the SCSI commands so the operating system (OS) will see the storage as a local SCSI device that can be formatted as usual. Today, some of iSCSI's popularity in small to midsize businesses (SMBs) has to do with the way server virtualization makes use of storage pools. In a virtualized environment, the storage pool is accessible to all the hosts within the cluster and the cluster nodes nodes communicate with the storage pool over the network through the use of the iSCSI protocol.

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In the M.2 interface standard, which card slot standard does NOT support a card measurement of 2230?

In the M.2 interface standard, which card slot standard does NOT support a card measurement of 2230?

• A
• B
• M
• E 

EXPLANATION

While the A, B, and E style card slots each support cards with a measurement of 2230 (22mm wide, 30mm long), the M style does not.
Source: Arstechnica

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