WHM - Block An IP

I am looking for an easy, yet effective way of blocking an IP from connecting to my server. My server logs show a single IP connecting to my server via SSH and having login failures using dozens of different log in names.

Can you suggest a quick/easy way to block this IP from hitting my server?

I am running WHM/cPanel on CentOS 3.4.

TIA!

 

 

 

 

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