Job teriminated due to communication in the midle of the process, data loded partially into destidation table, what is best approach?

Hi can any one suggest me how to resolve the below issue

If Job failure occurred in the middle of the process due to network issue and data loaded partially from source to dwh.

When we restart the job process, I don't want to load data that has already been loaded.

for example in detail :

I've got about 100 million rows that I'm moving in SSIS 2012 via a Data Flow Task.  It's pretty much a straight table data copy from source to destination. 

Due to communication problem job has been terminated and loaded 50million records into destination table.

to resolve this issue what is the best approach

please share your ideas from your experience.

thanks in advance

HarSan

HarSan