Functional dependence: what is it?

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The concept of functional dependence appears in several contexts of mathematics and logic and refers to certain mathematical entities can be expressed as mathematical functions of other entities. The concept of functional dependence is a generalization of the concept of linear dependence. It is said that a set of functions is functionally dependent when there is a functional relationship between …

What is a Loopback plug?

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A loopback plug allows us to test if the Ethernet transmission and reception electronics are working correctly, with it we can easily locate damaged ports in network cards or in a switch. In addition, this tool is necessary for laboratory or test environments, in which we need our Ethernet network adapter to detect connection to the cable and if is …

What are the Functional Testing?

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The functional tests are usually the last tests that are carried out at the time of giving the pass to production to any type of software. This type of tests are also called “Black Box”, since the “Tester” focuses on analyzing the input and output data to define test cases that will be ready before the start of these. The …

What are VPN Concentrators?

Software
In today’s society, any company needs to be up-to-date on all the topics of networks, computing and technology, to offer a better service to its customers and to have greater security and be protected from computer attacks that may come from outside. In addition, a better network system and better equipment makes it easier for employees to carry out their …

Referential Integrity

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This topic is one of the most important aspects to add consistency to database designs. Integrity constraints help maintain the semantic consistency of the data. Integrity constraints provide a means of ensuring that modifications made to the database by authorized users do not cause loss of data consistency. That is, they protect the database against accidental damage. One of those …

What is a Domain Controller?

Software
Normally the Windows operating system saves the passwords of the users in a file called SAM in the folder \WINDOWS\system32\config\ So far we’re doing fine: We have a computer that keeps its own passwords on its own hard drive. A domain controller is a computer in which all the passwords of network users are stored centrally. Each computer will still …