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i need a pdf file 
pdf document should consists of name ,id,name of the institution mail
 questions are:
1.using the layer models in figure 2.15 .describle the ordering and delivery of a pizza ,indicating the interacation at each level.
2.why is UDP needed ?why cant a user program directly access ?
3.find the period of the function f(t) = ( 10 cost)2
4.list the major disadvantages with the layered approach to protocols
5.a signal has a fundamental frequency of 1000Hz.what is its period?

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