Which layer of the OSI model is responsible for managing and terminating the connections between the local and remote application?

Which layer of the OSI model is responsible for managing and terminating the connections between the local and remote application?

• Application layer
• Network layer
• Data link layer
• Session layer 

EXPLANATION

The session layer controls the dialogues (connections) between computers.
It establishes, manages and terminates the connections between the local and remote application.

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In a Unix environment, what is a daemon?

In a Unix environment, what is a daemon?

• A multicore processor type for Linux OS
• A type of virus or malware
• A different user interface or desktop
• A program that runs as a background process

 

EXPLANATION

Wikipedia entry: A daemon is a computer program that runs as a background process,
rather than being under the direct control of an interactive user.

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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?

• IaaS
• Highly portable
• PaaS
• Highly available 

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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A user can receive email but cannot send any. Which protocol, responsible for sending email, is potentially not configured properly?

A user can receive email but cannot send any. Which protocol, responsible for sending email, is potentially not configured properly?

• SNMP
• FTP
• POP3
• SMTP

EXPLANATION

The simple mail transfer protocol (SMTP) is probably not configured properly.
When troubleshooting, you need to confirm the SMTP setting because it is responsible for sending mail. POP3 receives mail, so wouldn't be responsible for the send issue, unless you are using Outlook (where POP3 authentication is required before email can be sent over SMTP). FTP sends files to remote computers and SNMP is used to manage networks.
FTP and SNMP are not responsible for users sending or receiving email.

SOURCE

http://searchexchange.techtarget.com/definition/SMTP

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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 

 

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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