What is the transfer rate of a standard USB 2.0 Device?

What is the transfer rate of a standard USB 2.0 Device?

• 250 Mbit/s
• 480 Mbit/s
• 100 Mbit/s
• 1 Gbit/s 

EXPLANATION

The now-aging USB 2.0 standard can theoretically transfer data at a very high 480 megabits per second (mbps), or 60 megabytes per second (MBps). That’s impressive, but not as much as the newer USB 3.0, which can handle up to 5gbps (640MBps)—over ten times as fast as the 2.0 maximum.

Release versions

Name	Release date	Maximum transfer rate	Note
USB 0.7	November 11, 1994	?	Pre-release
USB 0.8	December 1994	?	Pre-release
USB 0.9	April 13, 1995	Full Speed (12 Mbit/s)	Pre-release
USB 0.99	August 1995	?	Pre-release
USB 1.0-RC	November 1995	?	Release Candidate
USB 1.0	January 15, 1996	Full Speed (12 Mbit/s), Low Speed (1.5 Mbit/s)
USB 1.1	August 1998	Full Speed (12 Mbit/s)[35]
USB 2.0	April 2000	High Speed (480 Mbit/s)
USB 3.0/3.1 Gen 1/3.2 Gen 1×1	November 2008	SuperSpeed USB (5 Gbit/s)	Also referred to as USB 3.1 Gen 1[27] and USB 3.2 Gen 1×1
USB 3.1 Gen 2/3.2 Gen 2×1	July 2013	SuperSpeed USB 10Gbps (10 Gbit/s)	Includes new USB 3.1 Gen 2[27] which is later also named USB 3.2 Gen 2×1
USB 3.2 Gen 1×2	August 2017	SuperSpeed USB 10Gbps (10 Gbit/s)	Includes new USB 3.2 Gen 1×2
USB 3.2 Gen 2×2	August 2017	SuperSpeed USB 20Gbps (20 Gbit/s)	Includes USB 3.2 Gen 2×2 multi-link modes[36][not in citation given]
USB 4	TBD Estimated TBA	(40 Gbit/s)

SOURCE

https://www.pcworld.com/article/2360306/usb-3-0-speed-real-and-imagined.html

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What is the main function of BIOS?

What is the main function of BIOS?

• To enable the graphics card
• To load the operating system
• To upgrade drivers
• To enable the network card 

EXPLANATION

BIOS uses Flash memory, a type of ROM. The BIOS software has a number of different roles, but its most important role is to load the operating system.
When you turn on your computer and the microprocessor tries to execute its first instruction, it has to get that instruction from somewhere.

SOURCE

https://computer.howstuffworks.com/bios1.htm

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What is the intended range for a Class 1 Bluetooth transceiver?

What is the intended range for a Class 1 Bluetooth transceiver?

• 33 meters
• 100 meters
• 500 meters
• 10 meters 

EXPLANATION

  Range of Bluetooth is dependant on its class and primarily there are three classes of Bluetooth:

•     Class 1 transmitting at 100 mW with a range of 100 meters or 328 feet.
•     Class 2 transmiting at 2.5 mW with a range of 10 meters or 33 feet (most Bluetooth headsets and headphones are common Class 2 devices).
•     Class 3 transmitting at 1 mW with a range of fewer than 10 meters.

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What is the purpose of an Exchange Autodiscover?

What is the purpose of an Exchange Autodiscover?

• It is the Microsoft version of an MX record, which tells the interwebs where mail goes and stuff...
• To pool then auto populate mail info into outlook.
• allow exchange OWA to allow users easier login.
• to establish initial connections to Exchange user mailboxes. 

EXPLANATION

Exchange Autodiscover is a web service that helps Microsoft Exchange administrators configure user profile settings for clients running Outlook 2007, Outlook 2010, or Outlook 2013 and mobile phones running Windows Mobile 6.1 or later.
Introduced in Exchange Server 2007, the primary purpose of the Exchange Autodiscover service is to establish initial connections to Exchange user mailboxes. Once

SOURCE

https://searchwindowsserver.techtarget.com/definition/Exchange-Autodiscover-service

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You wish to place a video on a webpage such that it will be playable directly in the browser. Which is the most suitable file type to use?

You wish to place a video on a webpage such that it will be playable directly in the browser. Which is the most suitable file type to use?

• .rm (Realmedia)
• .webm (WebM)
• .flv (Adobe Flash)
• .mov (Quicktime) 

 

EXPLANATION

Most modern browsers can play the .webm file format directly, without the need for any special plugins. Many can also play .mp4 (MPEG 4) or Ogg files directly, so that could also be an option. However, support for these is not as universal.
WebM is actually a subformat of the Matroska container, with video in VP8 or VP9  encoding, and audio in Vorbis. or Opus. VP8 and Vorbis will give the widest compatibility.
The older standards of Realmedia, Quicktime, and Flash Video required special plugins to be installed, and in some cases these plugins suffered numerous security vulnerabilities. Thus, their use is to be discouraged. 

Support for WebM on legacy hardware is good, provided that a modern browser is installed. MPEG 4 is less likely to work in browsers on older operating systems, although the free VLC Media Player can play the downloaded files if streaming is not possible.

https://fileinfo.com/extension/webm

SOURCE

https://developer.mozilla.org/en-US/docs/Web/HTML/Supported_media_formats

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