Creating a 100Mb of file using DD

I'm not more on using dd since then on linux, but this time DD command is one the most useful tool on linux. I'm looking a way where i can create a 100Mb file for testing uploading and downloading for our network, so dd comes in my mind..here's how i do it.

1. go to /tmp or any directory you want to uphold the 100Mb file 

2. dd if=/dev/zero of=100MBfile bs=1M count=100

3. or dd if=/dev/zero of=100Mbfile bs=100M count=1

Legend : 

dd - convert and copy file -> man dd

of=FILE - write to file instead stdout

bs=BYTES - read and write Bytes at a time 

count=BLOCKS - copy only BLOCKS input blocks