Linux Yum command help needed

[NFT]

Hi there,

I am happy to be a part of this network.It has been very useful so far.I am preparing for RHCE & I have been using Centos 7 for practice.But the Yum commands are not functioning.It says "Forbidden". Kindly update on this.I am very soon going to appear for this exam and linuxzoo has been very helpful so far.

Thanks & regards,
Firasath.