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2 NICs and the Hostname



I have 2 NICs installed in my system and a Primary name + domain name for each that have different names under Adapter 1 and 2 respectively. I understand that this is so to allow ping with a specific IP or by using the alias. But, why does the HostName field has an IP address under it.  Why  is there  only a Host Name tab? I notice when changing it, the change is reflected when I input command lines in one of the many terminal programs. For example, it was [root firstname_used] and when I changed it, it became [root second_used]  Is the Hostname tab primary for this. I assumed that it identified the entire computer as one and could be referenced through the network as I do by pinging a NIC. Can someone enlighten me in this matter? Thanks. 

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