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The advantage of packet switching vs. circuit switching. The following figure shows that many users are sharing a 4Mbps access link to the Internet. Suppose each user is either in active status that required data access rate of 100k Bytes/second, or in silence status that the user requires no data. Each user is active 5% of the time, and users are independent with each other in their activities.
a). If circuit switching is used, how many user can this access link support?
b). If packet switching is used and there are 8 users. How often is this access link idle? How often does this link serve exactly two users? You must provide the final numerical solution.
c). If packet switching is used and there are 30 users, how often does the access link be congested? You must provide the final numerical solution.
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