Which version of Apple's desktop OS changed the name from OS X to macOS?

Which version of Apple's desktop OS changed the name from OS X to macOS?

• Sierra
• El Capitan
• Mavericks
• Snow Leopard 

EXPLANATION

Sierra, also known as macOS 10.12, is the 13th version of OS X, released on September 20, 2016. It followed El Capitan (OS X 10.11) and is preceded by macOS High Sierra. Sierra was the first version of OS X that Appleofficially labeled "macOS" instead of OS X.
Like other incremental releases of Apple's desktop operating system, Sierra built on previous versions, incorporating the same user interface and adding several new features. Notably, Sierra was designed to work more seamlessly with other Apple devices, such as iPhones and Apple Watches. For example, Sierra was the first version of macOS to support Universal Clipboard, which allows you to copy something on your phone and paste it on your Mac, or vice versa. It also supports automatic log in to your Mac using an Apple Watch. Safari, the web browser included with macOS Sierra, supports Apple Pay using an iPhone or Apple Watch.
Sierra also increased iCloud integration by syncing the Desktop and Documents folders with iCloud drive. This makes it easier to keep files consistent across multiple Macs. It was also the first version of Apple's desktop OS to include Siri, Apple's voice assistant that was introduced in iOS. Siri can be accessed by clicking the icon in the right side of the menu bar or by pressing and holding Command+Space Bar. You can speak commands, such as "Show my Downloads folder" or "Make the screen brighter," instead of performing the actions with your keyboard and mouse.
NOTE: Before Mac OS X (introduced in 2001), Apple's desktop operating system was called "Mac OS." With the release of Mountain Lion (OS X 10.8) in 2012, Apple changed the name from Mac OS X to just "OS X." The switch to "macOS" with Sierra marks a return to the "Mac OS" name, while using the same naming convention as Apple's other operating systems – iOS, watchOS, and tvOS.

SOURCE

http://fortune.com/2016/06/13/apple-mac-os-sierra/

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As a general rule, when working with Access Control Lists (ACLs), the last line of the file should...

As a general rule, when working with Access Control Lists (ACLs), the last line of the file should...

• Contain a full stop[Explicitly deny].
• Implicitly allow all.
• Be an implicit deny.
• Only allow you. 

EXPLANATION

Explicitly deny all traffic with an EtherType ACE, then IP and ARP traffic is denied; only physical protocol traffic, such as auto-negotiation, is still allowed.
The file can contain blank lines.
As the last rule a general ban is inserted automatically.
To make it obvious, an explicit deny should be entered anyway as the last rule. The rules are checked sequentially from the “top down”. The first relevant rule determines the result (“first match”).

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In Windows, what does does WMI stand for?

In Windows, what does does WMI stand for?

• Windows Management Instrumentation
• Windows Machine Interface
• Windows Management Infrastructure
• Windows Management Interface 

EXPLANATION

Windows Management Instrumentation consists of a set of extensions to the Windows Driver Model that provides an operating system interface through which instrumented components provide information and notification. WMI is Microsoft's implementation of the Web-Based Enterprise Management (WBEM) and Common Information Model (CIM) standards from the Distributed Management Task Force (DMTF).

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What does IaaS stand for?

What does IaaS stand for?

• Infrastructure as a Service
• Infrastructure as a System
• Infrastructure as a Storage
• Infrastructure as a Server

EXPLANATION

IaaS Definition

IaaS offers businesses and organisations various services and solutions such as pay-as-you-go Cloud storage, networking and VM’s (Virtual Machines).

It offers a cloud-based alternative to on-premise infrastructure so that business don’t have to invest in expensive and on-site equipment.

To put that into simpler language; picture your I.T department for a moment. Do they have a server room somewhere in the building?

That’s on-premise infrastructure.

Now imagine that room wasn’t there anymore and those ‘servers’ were virtual machines on the internet. That’s IaaS.

Infrastructure as a Service delivered over the internet.
Benefits Of IaaS

Having on site infrastructure (like servers) is expensive, labour intensive, takes up valuable office space and with depreciation of hardware isn’t a great long-term investment.

It can often involve an expensive up-front cost for the physical hardware plus the cost of installing and then, on a day to day basis, maintaining it.

The benefit of IaaS is that you only need to buy what you need as you need it, purchasing more as your business expands.

This makes it a flexible and scalable solution that can be upgraded or replaced as per business demands compared to expensive physical hardware, that due to its high initial cost you may need to ‘get the most out of’, even if it’s long past it’s best.
Examples of IaaS

    Microsoft Azure,
    Amazon Web Services (AWS),
    DigitalOcean,
    Linode,
    Rackspace,
    Cisco Metapod,
    Google Compute Engine (GCE)

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In computing, what is a "bus"?

In computing, what is a "bus"?

• Boolean Undulated Synchronization.
• The part of the memory that processes data
• A communication system that transfers data between components inside a computer or between computers
• Binary Unified System

EXPLANATION

Bus :-bidirectional universal switch
use to transfer data or power between computer components inside a computer or between computer.
point to point connection.

The bus contains multiple wires (signal lines) with addressing information describing the memory location of where the data is being sent or retrieved. Each wire in the bus carries a bit(s) of information, which means the more wires a bus has, the more information it can address. For example, a computer with a 32-bit address bus can address 4 GB of memory, and a computer with a 36-bit bus can address 64 GB of memory.

Types of computer buses

A bus is either a parallel or serial bus, and either an internal bus (local bus) or an external bus (expansion bus).
Internal bus vs. external bus

An internal bus enables the communication between internal components, such as a video card and memory. An external bus is capable of communicating with external components, such as a USB or SCSI device.
Parallel bus vs. serial bus


A computer bus can transmit its data using either a parallel or serial method of communication. With a parallel bus, data is transmitted several bits at a time. However, with a serial bus, the data is transferred one bit at a time.
Bus speeds

A computer or device's bus speed is measured in MHz, e.g., an FSB may operate at a frequency of 100 MHz. The throughput of a bus is measured in bits per second or megabytes per second.

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