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Nt1310 Unit 3 Assignment

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ASSIGNMENT-3

1) A path in a digital circuit-switched network has a data rate of I Mbps. The exchange of 1000 bits is required for the setup and teardown phases. The distance between two parties is 5000 km. Answer the following questions if the propagataion speed is 2 X 108 m:
a. What is the total delay if 1000 bits of data are exchanged during the data transfer phase?
b. What is the total delay if 100,000 bits of data are exchanged during the data transfer phase?
c. What is the total delay if 1,000,000 bits of data are exchanged during the data transfer phase?
d. Find the delay per 1000 bits of data for each of the above cases and compare them. What can you infer? Book Name: Data and Communication Networking …show more content…
With immediate release, it sends a token upon completion; the earliest it can then transmit again is 200µs later, when the token has completed a circuit. The station can thus transmit at most 82/282 =29% of the time, for an effective bandwidth of 29Mbps.With delayed release, the sender waits 200µs after beginning the transmission for the beginning of the frame to come around again; at this point the sender sends the token. The token takes another 200µs to travel around before the original station could transmit again (assuming no other stations transmit). This yields an efficiency of 82/400 = 20%

3) Calculate the bandwidth ×delay product for the following links. Use one-way delay, measured from first bit sent to first bit received.
(a) A 10-Mbps Ethernet with a delay of 10 μs.
(b) A 10-Mbps Ethernet with a single store-and-forward switch like that of
Exercise 18(a), packet size 5,000 bits, and 10 μs per link propagation delay.
(c) A 1.5-Mbps T1 link, with a transcontinental one-way delay of 50 ms.
(d) A 1.5-Mbps T1 link through a satellite in geosynchronous orbit, …show more content…
Alternatively, each link can hold 100 bits and the switch can hold 5000 bits.
(c) 1.5×106bits/sec×50×10−3 sec = 75,000 bits = 9375 bytes
(d) This was intended to be through a satellite, i.re. between two ground stations, not to a satellite; this ground-to-ground interpretation makes the total one-way travel distance 2 ×35,900,000 meters. With a propagation speed of c= 3 ×108meters/sec, the one-way propagation delay is thus2 × 35,900,000/ c= 0.24 sec. Bandwidth×delay is thus 1.5×106bits/sec×0.24sec = 360,000 bits≈ 45 Kbytes

4) A client uses TCP to send data to a server. The data consist of 16 bytes. Calculate the efficiency of this transmission at the TCP level (ratio of useful bytes to total bytes). Calculate the efficiency of transmission at the IP level. Assume no options for the IP header. Calculate the efficiency of transmission at the data link layer. Assume no options for the IP header and use Ethernet at the data link layer.
Book Name: TCP/IP Protocol Suite
Author Name: Behrouz A. Forouzan
Chapter-15

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