How did the han dynasty provide those who traded along the silk road protection?

The Silk Road had many raiders who took everything they were trading which basically ruined the whole point of trading anything.

To prevent this, the Han Dynasty realized they needed to protect the traders from being robbed. 

They extended the Great Wall of China to protect the trade route :)

To have a bunch of countries to team up, and communicate not let the communist break them apart and take over the world