[ns] Simulating WSN using Mannasim or the current Wireless system

[Farzaneh]

Hi Dears,

Do we have to use Mannasim for WSN simulating or we can just use the ordinary 
Wireless System in NS?
Do we have to use 802.15.4 (ZigBee) or we can use 802.11?
Thanks for your Kindness.