While I studying for the CCNA exam I came across a topic known as 802.1q trunk to router which is also commonly referred to router-on-a-stick or ROAS. This being a vital topic for the exam I wanted to write this how-to article in hopes that it aids others in their studies.
Simply put, if you have multiple VLANS and you wish for hosts to communicate with one another then you need to implement a layer 3 device such as a Router to perform routing between the VLANS.
Routing in this scenario is easily accomplished by implementing ROAS. Make sure you have the following