1.7 Encapsulation Principle
The result of what happens when you combine layering and packet switching
Each packet contains data from multiple layers
The principle by which you organize information in packets so that you can maintain layers, yet let them share the contents of packets
Each protocol layer has some headers, payload, footers
E.x. IP packet header: source addr, dest addr
To send TCP segment with IP, make the TCP format the payload of the IP packet (IP packet "encapsulates" the TCP segment)
Encapsulation
Browsing a web using a computer connected through WiFi
Generates an HTTP GET request
Payload of a TCP segment
Payload of IP packet
Payload of WiFi frame
Both correct
Encapsulation Flexibility
Able to layer recursively
Transport layer security (TLS)
Allows you to access private, protected network resources inside your office
TLS session is inside a TCP stream that terminates at the virtual private network gateway
How we take protocol layers and assemble them into packets in a way that's flexible and maintains their separation of concerns
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