Different between alive and active host

[Man8]

From Credential-less host Discovery, it mentioned that "the Shazzam probe scans a host that is alive but not active".

How to define alive and active?

What is the different between alive and active?

https://docs.servicenow.com/bundle/newyork-it-operations-management/page/product/discovery/reference...

[adilrathore]

Alive means no ports on the device are open, but at least one port responded.  Active means at least one port on the device is open. Here is the reference document:

ShazzamResult - Global

[Man8]

Thanks Adilrathore

I am a bit confusing 

For "Alive means no ports on the device are open, but at least one port responded."

If no ports are open, how will be at least one port responded?

[Fares K]

Suppose you want to SSH on a server.
If the port 22 is closed, it will refuse the connection --> Alive

Consider it like this : if you can ping it, it's alive, if you can connect to it, it's active. 

[Man8]

Thanks Fares

I understood your example.

Just wanna know more specific 

How many port will discovery try to make connection before confirming the device is not active? What are the ports?

and what port will be used to identify the device is alive?