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Monday, April 30, 2018

Computers need to maintain certain settings (for example, date, time, some hardware settings, etc.) even when they are completely powered off. Such settings are used at start-up (among other uses). Where are these settings stored and maintained?

Computers need to maintain certain settings (for example, date, time, some hardware settings, etc.) even when they are completely powered off. Such settings are used at start-up (among other uses). Where are these settings stored and maintained?

  • In the BIOS
  • In Zone 0 of the hard drive
  • In the CMOS
  • In the Operating System 

 
Computers need to maintain certain settings (for example, date, time, some hardware settings, etc.) even when they are completely powered off. Such settings are used at start-up (among other uses). Where are these settings stored and maintained?

EXPLANATION

CMOS, which stands for "Complementary Metal-Oxide Semiconductor", is a battery-powered semiconductor chip that stores information such as date, time and certain hardware settings. A tiny battery, similar to a watch battery, is what allows the CMOS to maintain information while the machine is powered off. As they are typically designed to last about ten years, and since most computers get scrapped before then, this is why you probably haven't had to replace many CMOS batteries.


While the BIOS uses data from the CMOS, these are two separate things. See the following for more information on the difference between the two and how they work together: http://www.computerhope.com/issues/ch001360.htm

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Saturday, April 28, 2018

How many kibibytes (KiB) are in 1 tebibyte (TiB)?

How many kibibytes (KiB) are in 1 tebibyte (TiB)?

  • 1,073,741,824 KiB
  • 1,048,576 KiB
  • 10,240,000,000 KiB
  • 1,000,000 KiB 

 
How many kibibytes (KiB) are in 1 tebibyte (TiB)?

EXPLANATION

The interpretation of the older term "kilobyte" to denote 1024 bytes, conflicting with the SI definition of the prefix kilo (1000), is still common, mostly in informal computer science contexts
1 kibibyte = 1,024 bytes
1 mebibyte = 1,024 kibibytes
1 gibibyte = 1,024 mebibytes = 1,048,576 kibibytes
1 tebibyte = 1,024 gibibytes = 1,048,576 mebibytes = 1,073,741,824 kibibytes
https://en.wikipedia.org/wiki/Kibibyte

SOURCE

https://en.wikipedia.org/wiki/Kibibyte
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What TCP port is SFTP or Secure File Transfer Protocol commonly used on?

What TCP port is SFTP or Secure File Transfer Protocol commonly used on?

  • 7777
  • 69
  • 22
  • 21 

 
What TCP port is SFTP or Secure File Transfer Protocol commonly used on?

EXPLANATION

Secure File Transfer Protocol is commonly placed on 22 as it is also known as File Transfer Protocol on SSH. Not to be confused with File Transfer Protocol over TLS/SSL or FTPS, as there are no answers for ports 989 or 990.
 For more information, see:
https://support.apple.com/en-us/HT202944
https://www.infobyip.com/tcpportchecker.php
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What are the tones called when you press a key on your telephone?

What are the tones called when you press a key on your telephone?

  • Multiple Frequency Tone Signal
  • Dual Signal Tone Frequency
  • Dual Tone Multiple Frequency (MF4)
  • Single Tone Frequency 
What are the tones called when you press a key on your telephone?

EXPLANATION

DTMF (dual tone multi-frequency) is the beeping signal to the phone company that you generate when you press an ordinary telephone's touch keys.

https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling

SOURCE


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What is DCL used for in SQL?


What is DCL used for in SQL?

  • Monitor database transactions
  • Solving deadlock situations
  • Control access to data stored in a database
  • Control database size and archiving schedule 

 

EXPLANATION

A data control language (DCL) is a syntax similar to a computer programming language used to control access to data stored in a database (Authorization). In particular, it is a component of Structured Query Language (SQL).
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