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Loop, is a word. We could say that the Earth loops the sun. Because the Earth in his orbit, has always the same path, so is going nowhere, its looping and never stop. Around and around, year by year. Looping the sun.

A loopback, is back, because someone is checking it. Back in his office or node or house. Testing it, and checking if the loop is good or not. For example: God was checking the universe, and say: lets loop all planets to the sun. Set loopback to earth at 395 days, set loopback to Pluton to... etc.

As he is checking it, testing it, creating it, etc... its making a loopback.

Null, is a logically concept.

As a loop or loopback could be theorical, logical, or physical (mathematics, hardware, or software) null is always logical.

Null is like a void, a dead end, a trash without recovery. All that is dropped there, you never see it again.

The way more easly to undertand, is that in maths, null is the same to say zero: 0.

In computers a null interface, device, cable, etc... is going to nowhere.

And all to a null int. will be losted.

Equal if we want it to multiply some number by zero (null).

43213421145678765432 x 0 = 0.

That means that no matter what is the number, the amount, or the data... it wont exist at the end.

If i say that tomorrow i will be driving on the null freeway, that is suicide.

If i say that now im playing revolver null Russian roullete... means that my gun doesnt have any ammo. XD.

Have a nice day !

:D

LM.

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Q: What is the difference between a null and loop-back interface?
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