Newbie - memory usage

Hi all, a revently installed debian on my server that has 2 gb ram.
when i write free from console, i can see:

total used free shared buffers cached
Mem: 905400 555020 350380 0 102888 297764
-/+ buffers/cache: 154368 751032
Swap: 1951888 0 1951888

why in the total field i see only 905400 ?

another question, must i activare the swap ?

thanks a lot to all.

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