This week we are working on a papper: OSI model 1. Describe layer 2（data link layer） of OSI model, what is the function and what is layer 2 responsible for. You need to focus on a simple point to point data link frame aspects.  2. Describe layer 3(network layer) of OSI model, the functionality and important functions. Use IP as an example. 3. Describe layer 4(transport layer) of OSI model. Focus on key functionality areas. Use TCP protocol as an example ...

1. This week we are working on a papper: OSI model
1. Describe layer 2（data link layer） of OSI model, what is the
function and what is layer 2 responsible for. You need to focus
on a simple point to point data link frame aspects.
2. Describe layer 3(network layer) of OSI model, the
functionality and important functions. Use IP as an example.
3. Describe layer 4(transport layer) of OSI model. Focus on key
functionality areas. Use TCP protocol as an example