Which of the following is true of IMAP?

Which of the following is true of IMAP?

• It uses port 110
• It sends and receives email
• It can only be used to send email
• It leaves messages on the mail server 

EXPLANATION

Unlike POP3, IMAP does not directly download and then remove messages from the mail server. Instead, it leaves the email on the server so that messages can be retrieved from various locations. IMAP is used only to retrieve email and uses port 143.
Here is some further discussion about this question

SOURCE

https://www.siteground.com/tutorials/email/pop3-imap-smtp-ports.htm

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What Linux command sets a files permission?

What Linux command sets a files permission?

• properties
• rights
• chmod
• attrib 

EXPLANATION

In order to make this practical, a method had to be devised to protect the users from each other. After all, you could not allow the actions of one user to crash the computer, nor could you allow one user to interfere with the files belonging to another user.
This lesson will cover the following commands:
chmod - modify file access rightssu - temporarily become the superuserchown - change file ownershipchgrp - change a file's group ownership

SOURCE

http://linuxcommand.org/lc3_lts0090.php

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Which of the following does ROBOCOPY stand for?

Which of the following does ROBOCOPY stand for?

• Recursive File Copy
• Robust File Copy
• Read Only Block Option Copy
• Robot Copy 

EXPLANATION

ROBOCOPY, or "Robust File Copy", is a command-line directory and/or file replication command

SOURCE

https://en.wikipedia.org/wiki/Robocopy

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Which of these is NOT a PHP class?

Which of these is NOT a PHP class?

• PDO
• XMLReader
• ErrorLog
• DateTime 

 

EXPLANATION

"ErrorLog" is the correct answer.  PHP has a function called "error_log", but it returns true/false and there is no object-oriented version like there is with some of the other classes.
PDO is a PHP extension for working with databases. XMLReader and DateTime are also classes, though they both have procedural versions too.

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Which of these is NOT a utility that lets you create a bootable live USB drive for Linux?

Which of these is NOT a utility that lets you create a bootable live USB drive for Linux?

• LiveUSB Install
• UNetbootin
• GotLive
• LiLi 

EXPLANATION

LinuxLive USB Creator (also known as Lili) is a free and open-source software for Windows that can be used to install various Linux compilations, versions and distributions to a USB Flash Drive. The end result is a Bootable Live USB (in some cases with Persistence as well). UNetbootin allows you to create bootable Live USB drives for Ubuntu and other Linux distributions without burning a CD.

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Cloud solutions that can tolerate failures yet still provide service are referred to as what?

Cloud solutions that can tolerate failures yet still provide service are referred to as what?

• Highly available
• Highly portable
• PaaS
• IaaS 

EXPLANATION

High availability ensures that cloud solutions are always accessible. This means eliminating single points of failure, such as storing data on a single hard disk or single network connections.

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What MySQL feature allows for queries to be run periodically in the background, independent of a front-end program?

What MySQL feature allows for queries to be run periodically in the background, independent of a front-end program?

• MySQL Automatic Events
• MySQL Task Manager
• MySQL Event Scheduler
• MySQL Scheduled Tasks 

 

EXPLANATION

The MySQL Event Scheduler allows for queries to be run in the background at scheduled times, either as a one-off or recurring event.

SOURCE

https://dev.mysql.com/doc/refman/5.7/en/events-overview.html

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