I am looking good:
/test 192.168.1.100(rw,sync)
On client machine:
mount 192.168.1.100:/test /mnt/nfs
That is rather strange

I can conclude that your server is 192.168.1.100?
I would think you exports file is incorrect.
Then you only allow your server itself to mount it.
Are there any other access restrictions? Like attributes?