Now we have CentOS 7 minimal installed and the IP configured, first thing we want to do is upgrade ( update + enable obsoletes processing during updates)
yum update && yum upgrade
If you find the prompt for ‘Do you want to install those blah blah’ annoying, do this:
yum -y update && yum -y upgrade
It is however always a good idea to check and see what is actually getting updated.
Next we want to install telnet:
yum install telnet -y