What is the minimum number of drives required for a non-degraded Raid 5 array?

What is the minimum number of drives required for a non-degraded Raid 5 array?

• 2
• 4
• 5
• 3

 

 

EXPLANATION

RAID 5 requires 3 disks. It consists of block-level data striping with distributed parity. This means that data is striped across multiple disks with fault-tolerant parity data written to each disk. If one disk fails, the array can reconstruct the data from the parity information. 

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In a computer device, which of the following types of memory has the fastest access time?

In a computer device, which of the following types of memory has the fastest access time?

• PCIe based SSD memory
• RAM
• CPU register
• CPU cache 

 

EXPLANATION

The faster the memory is the more expensive. Also the closer to the CPU is the lesser the latency would be. In this regard one can reasonably suggest which is the fastest memory only be looking by it size and location in the system.

The fastest memory block in a computer is the CPU register but it is also the smallest. It is followed by various levels of CPU cache. More info can be found here:
http://www.moreprocess.com/devices/computer-memory-hierarchy-internal-register-cache-ram-hard-disk-m...

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In computing security, which of the following describes a nonce?

In computing security, which of the following describes a nonce?

• A hacking algorythm
• No Other non-Critical Events
• A value used once
• A vector 

 

EXPLANATION

Typically, a nonce is some value that varies with time, although a very large random number is sometimes used. A nonce can be a time stamp, a visit counter on a Web page, or a special marker intended to limit or prevent the unauthorized replay or reproduction of a file.

SOURCE

http://searchsecurity.techtarget.com/definition/nonce

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What type of RAID is RAID-Z?

What type of RAID is RAID-Z?

• Hardware RAID
• Software RAID
• not a RAID
• Virtual RAID 

 

EXPLANATION

RAID-Z is a software raid achieved by

data/parity distribution scheme like RAID-5, but uses dynamic stripe width: every block is its own RAID stripe. It is primarily used by ZFS file system.
https://en.wikipedia.org/wiki/ZFS#RAID-Z

SOURCE

https://en.wikipedia.org/wiki/ZFS#RAID-Z

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In computing, what is an octet? Checkmark A byte that is 8 bits A group of 8x8 bits A byte that is 80 bits A short string of coding

In computing, what is an octet?

• A byte that is 8 bits
• A group of 8x8 bits
• A byte that is 80 bits
• A short string of coding

 

EXPLANATION

An octet is a byte, that is eight bits. This unit of digital information is often used in computing and telecommunications when the term byte might be ambiguous,
since historically there was no standard definition for the size of the byte. The usage of the old term octad(e) for 8 bits is no longer common today. (wiki)

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What is one of the primary weaknesses of symmetric cryptography?

What is one of the primary weaknesses of symmetric cryptography?

• Hard disk storage
• RAM memory requirement
• CPU processing speed
• Key Management 

EXPLANATION

Symmetric cryptography is usually fast and easy to implement. This is because encryption and decryption with a private key requires less complex computation than other types of cryptography. The significant disadvantage of symmetric encryption relate to the difficulties of managing the private key.
 

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Apple's Profile Manager is an example of what type of service?

Apple's Profile Manager is an example of what type of service?

• MDM
• ASM
• APPL
• DEP 

 

EXPLANATION

Apple's PRofile Manager is an example of a Mobile Device Management (MDM) service. Profile Manager can be used to control and distribute settings, apps and other content to Apple OSX and Apple iOS devices.

SOURCE

https://support.apple.com/profile-manager

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