Chuck,Altif,Priscilla.....save me.....

it says in my book BCRAN

"a loopback interface is a virtual interface that never goes down ,therefore 
it is an ideal line to use as the reference when using the ip unnumbered 
command"

i don`t understand ... a loopback interface dosen`t go 
anywhere????...how,why would i reference this ....Can i have a real world 
example as i don`t seem to understand WHY i would do this....

sorry i`m being a bit thick

thanks to ALL in advance
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