2. ARQ Protocols: Stop and Wait/Go Back N/Selective Repeat a. Why are we studying these protocols: Stop and Wait, Go Back N and Selective Repeat? b. Why do the protocols need sequence numbers (SN) to operate? c. Why do we need ACKs? d. Why do the protocols require a Timer? e. What are 3 different events that can cause the timer to expire in the ARQ protocols?

The “rule of 72” is used to approximate the time required for prices to double due to inflation. if the inflation rate is r%, then the rule of 72 estimates that prices will double in 72/r years. for instance, at an inflation rate of 6%, prices double in about 72/6 or 12 years. write a program to test the accuracy of this rule. for each interest rate from 1% to 20%, the program should display the rounded value of 72/r and the actual number of years required for prices to double at an r% inflation rate. (assume prices increase at the end of each year.)

Which of these is an example of an integrated presentation? a. a table created in powerpoint b. an image pasted into powerpoint c. a caption created in powerpoint d. an excel chart pasted into powerpoint

Explain how email technologies enable the exchange of messages between users. find out the typical parts of an email address and explain each part.