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Friday, June 21, 2019

A DNS SPF record is for:

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A DNS SPF record is for:

  • Identifying mail server IP address(es) authorized to send on a domains behalf
  • Resolving an ip address from a fully qualified host name
  • Resolving the address of a mail server responsible for accepting mail messages on behalf of a domain
  • Resolving an alias name to a host 

A DNS SPF record is for:

EXPLANATION

A Sender Policy Framework (SPF) record is a type of Domain Name Service (DNS) TXT record that identifies which mail servers are permitted to send email on behalf of your domain. The purpose of an SPF record is to detect and prevent spammers from sending messages with forged From addresses on your domain.  

An SPF record is a Sender Policy Framework record. It's used to indicate to mail exchanges which hosts are authorized to send mail for a domain. It's defined in RFC 4408, and clarified by RFC 7208. SPF record format. SPF records are typically defined using the TXT record type.

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What was "SystemPro"

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What was "SystemPro"

  • The working title for AMD
  • The "first" real PC based Server.
  • The first chip from Intel
  • The first user group for system administrators 
What was "SystemPro"

EXPLANATION

Compaq SystemPro

The SystemPro from Compaq, released in November 1989, was arguably the first true PC based server. It supported Intel's 486 chip, a 32-bit bus, RAID disk and dual-processor support well before its main rivals. 



Innovative features

The SystemPro, along with the simultaneously released Compaq Deskpro 486, was one of the first two commercially available computer systems containing the new EISA bus. The SystemPro was also one of the first PC-style systems specifically designed as a network server, and as such was built from the ground up to take full advantage of the EISA bus. It included such features as multiprocessing (the original systems were asymmetric-only), hardware RAID, and bus-mastering network cards. All models of SystemPro used a full-height tower configuration, with eight internal hard drive bays. 

 

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In .NET, which of the following is NOT a value type?

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In .NET, which of the following is NOT a value type?

  • double
  • char
  • int
  • string

In .NET, which of the following is NOT a value type?

EXPLANATION

Main features of value types

A variable of a value type contains a value of the type. For example, a variable of the int type might contain the value 42. This differs from a variable of a reference type, which contains a reference to an instance of the type, also known as an object.
When you assign a new value to a variable of a value type, that value is copied. When you assign a new value to a variable of a reference type, the reference is copied, not the object itself.

Source

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/value-types

 

 
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In which version of Windows Server was Microsoft IPAM first released?

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In which version of Windows Server was Microsoft IPAM first released?

  • Windows Server 2012
  • Windows Server 2008
  • Windows Server 2012 R2
  • Windows Server 2003 
In which version of Windows Server was Microsoft IPAM first released?

EXPLANATION

 IPAM or IP Address Management is a solution introduced by Microsoft to Windows Server starting with 2012 which lets administrators manage their DHCP and DNS servers from a single console. Now that is a very simple explanation of the concept; IPAM can do a little more than just manage the servers like find available free addresses, view the address spaces from a single place, track an IP’s allocation by date and much more.

    This first post in the IPAM series will cover some basic topics regarding the product. In the next posts we will be installing it, configuring it and looking at some features. I am using Windows Server 2016 for the installation but most of the things are the same for 2012 and 2012 R2.
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Which CSS property is used to hide an element and will not affect the layout?

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Which CSS property is used to hide an element and will not affect the layout?

  • visibility: hidden;
  • display: none;
  • display: false;
  • visibility: false; 
Which CSS property is used to hide an element and will not affect the layout?

EXPLANATION

<!DOCTYPE html>
<html>
<head>
<style>
h2.a {
  visibility: visible;
}

h2.b {
  visibility: hidden;
}
</style>
</head>
<body>

<h1>The visibility Property</h1>

<h2 class="a">This heading is visible</h2>

<h2 class="b">This heading is hidden</h2>

<p>Notice that the hidden heading still takes up space on the page.</p>

</body>
</html>

 Output

The visibility Property

This heading is visible

Notice that the hidden heading still takes up space on the page.


Source

https://www.w3schools.com/CSSref/tryit.asp?filename=trycss_visibility

 

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