See how your data is "encapsulated" as it travels down the network stack.
You clicked a link to google.com. Your computer is preparing the request. Watch how it wraps your request in headers for each layer.
The software you are using (like Chrome) creates the raw data. In this case, an HTTP Request asking for a specific web page.
The exam will ask what happens at each layer. Remember:
• Transport handles port numbers and error checking.
• Network handles IP addresses and routing.
• Link is the physical hardware (NIC, Cables, MAC addresses).