Why use more than one ip#?

I was wondering what are the advantages or disadvantages of use more than one IP address on a web server? I have a server with one IP# that is running Bind for our Name Server, Apache and using name based virtual domains. My Host Provider has given me 4 other IP#'s and I wonder if there are any advantages/ disadvantages to using one IP# for Bind, and another IP# for Virtual domains?

 

 

 

 

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