In computer graphics, what is alpha compositing?

In computer graphics, what is alpha compositing?

• Removing unused image information from a layer and use it to enhance another one (8bit to 16bit)
• Combining an image with a background to create the appearance of partial or full transparency
• Combining images to achieve pseudo 3D look
• Removing a range of colors in RGB from an image for a stylized look

EXPLANATION

Alpha compositing is the process of combining an image with a background to create the appearance of partial or full transparency. 

It is often useful to render image elements in separate passes, and then combine the resulting multiple 2D images into a single, final image called the composite.

 For example, compositing is used extensively when combining computer-rendered image elements with live footage.               

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How many usable networks and hosts can be created using a 192.168.2.1/26 subnet?

 How many usable networks and hosts can be created using a 192.168.2.1/26 subnet?

• 4 Networks and 62 hosts
• 4 Networks and 64 Hosts
• 4 Hosts and 64 Networks
• 4 Networks and 192 Hosts      

EXPLANATION

a /26 CIDR in a class C network will provide 4 Networks and 62 usable hosts. This is calculated by the number of bits borrowed to create the network, in this case its 2 bits borrowed to create the Networks multiplied by the power of 2, 2^2=4 and the number of bits remaining for the hosts,  in the last octet 2^6 =64. 

Since you need to subtract 2 for the network and broad cast, it would be 64-2=62

2^(h-2) 

The Subnet mask would be 255.255.255.192 

In binary it would be , note that there are 8 bits in each Octet and borrowed 2bits, 8+8+8+2= 192

11111111.11111111.11111111.11000000

SinceSince

SOURCE

https://www.chabotcollege.edu/faculty/netacad/prot/sem1/study_sheets/detIPadd.htm          

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In Windows Server 2012 and later, which PowerShell cmdlet creates a new NIC team?

 In Windows Server 2012 and later, which PowerShell cmdlet creates a new NIC team?

• Add-NetLbfoTeam
• New-NetLbfoTeam
• Set-NewNICTeam
• New-LbfoTeam               

EXPLANATION

The New-NetLbfoTeam cmdlet creates a new NIC team that consists of one or more network adapters.

SOURCE

https://technet.microsoft.com/en-us/library/jj130847(v=wps.630).aspx

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What is the maximum user mailbox size for an Office 365 E3 license?

What is the maximum user mailbox size for an Office 365 E3 license?

• 50 GB
• 100 GB
• 1 TB
• Unlimited 

EXPLANATION

Simple question, something I learned recently as I was solving an issue with a user's mailbox.

User mailbox storage limit for an E3 license is 100 GB, it's archive limit is unlimited and its address list limit is 1000.

SOURCE

https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits

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What is the minimum PowerShell version that supports Desired State Configuration?

What is the minimum PowerShell version that supports Desired State Configuration?

• 2.0
• 4.0
• 5.0
• 3.0       

EXPLANATION

Desired State Configuration (DSC) was first included in Powershell Version 4 (a part of Windows Management Framework (WMF) 4.0) and further improved in later versions. 

DSC enables you to declare your computer configuration in scripts and then apply that configuration to computers programmatically. The computers are configured to the desired state and remain in the desired state. 

The configuration can be applied to one or many computers, making sure they're always compliant with your requirements.

Reference: https://msdn.microsoft.com/en-us/powershell/dsc/overview        

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If you enter the Linux command pwd, what happens?

 If you enter the Linux command pwd, what happens?

• You display your current working directory.
• You display a list of users logged into the system.
• You interactively change your system password.
• You send a file to the attached printer.               

EXPLANATION

The pwd is an acronym for print working directory. The pwd command is considered as one of the most frequently used commands on Linux, AIX, HP-UX, *BSD, and other UNIX like operating systems along with the ls, and cd commands.

https://www.cyberciti.biz/faq/pwd-linux-unix-command-examples/

SOURCE

https://www.cyberciti.biz/faq/pwd-linux-unix-command-examples/

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The traditional sector size for a HDD is 512 bytes. What is the first generation Advanced Format sector size?

The traditional sector size for a HDD is 512 bytes. What is the first generation Advanced Format sector size?

• 4096 bytes
• 1024 bytes
• 2048 bytes
• 8192 bytes         

EXPLANATION

Advanced Format is a generic term pertaining to any disk sector format used to store data on magnetic disks in hard disk drives (HDDs) that exceeds 512 to 528 bytes per sector, such as the 4096-byte (4 KiB) sectors of the first-generation Advanced Format hard disk drives.      

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