How-To "Check Network Adapter Details in Windows"

 We open a command prompt and type:

wmic nic get AdapterType, Name, Installed, MACAddress, PowerManagementSupported, Speed

The output will present all the network devices installed on our system as shown in Device Manager, including their MAC Address, the supported speed and their name.

How-To "Install Telnet on a Windows computer"

Since Telnet is not installed by default in Windows we can do so using the following procedure:

a. we press Start and then type cmd, Right-click on it and choose "Run As Administrator".

b. we execute the command: 

dism /online /Enable-Feature /FeatureName:TelnetClient

and the telnet utility is ready to be executed as a command from the command prompt!!!