You must show all work for numeric questions and explain your answers for credit

Question

You must show all work for numeric questions and explain your answers for credit. 1. Imagine that you have trained your pet goat, Bitey, to carry a box of five pre-loaded USB drives to you when you're desperate for a movie. These USB drives each contain 8 gigabytes of information. The goat can travel to your side, wherever you may be, at 10 km per hour. a) What is Bitey's effective data rate if you are 5 km away? b) What if you are 40 km away? Remember tha data rate is measured in bits/second bps. Make sure you are careful with your units. 2. A client and server (both on the Earth's surface) use a satellite network to communicate, with the satellite at an altitude of 60,000 km. What is the best case delay in response to a request? In other words, from the time the client transmits its request, how long before it receives the response? Remember that radio waves travel at the speed of light -3x10"8 meters/second. 3. Which of the OSI layers handles each of the following? a) Providing reliable service over 1 link b) Providing reliable service end to end (from source to destination) c) Translating data types between different representations on the source and destination machines d) Choosing the path from the source to the destination in a subnet e) Representing bit values over 1 hop f) Providing unreliable bit pipe

Explanation / Answer

1. It takes 30 minutes for bitey to travel 5kn so bit rate is 40GB/30mins = 40*10^9 / (30*60) = 22.22 MBps = 177,777,777.77 bps

It takes 4 hours to travel 40 km so the bit rate is 40GB/4hrs = 40*10^9 / (4*60*60) = 2.7 MBps.= 22,222,222.216 bps.

2. The best case propagation delay is = 120000*1000/(3*10^8)= 0.4sec

3a. Data Link layer

b. Transport Layer

c. Physical layer

d. Network layer

e. Physical Layer

f. Session layer

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