1. What is a protocol data unit (PDU) ? Give PDUs of each layer

These practice questions are designed based on the lectures completed to the date.  30% of the final score 
is allocated for completing tutorials.   
1. What is a protocol data unit (PDU) ? Give PDUs of each layer  
2. What is the purpose of adding a header at the each layer to form a PDU?  
3. The following figure shows the headers of TCP and UDP protocols. Referring these headers comment on the reliability and speed of both the protocols. 


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