Abstract
When designing a local area network (LAN), establishing performance characteristics of the network before putting it into use is of paramount importance; it gives the designer the freedom and flexibility to adjust various parameters of the network in the planning rather than the operational phase. However, it is hard to predict the performance of the LAN unless a detailed analysis of a similar network is available. Information on a similar network is generally hard to come by so that performance modeling of the LAN must be carried out.
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Problems
Problems
-
6.1
Describe briefly the seven layers of the OSI model.
-
6.2
Compare and contrast controlled access and random access protocols.
-
6.3
Explain how token ring works.
-
6.4
In a Cambridge ring with a data rate of 5 Mbps, each slot has 37 bits. If 50 stations are connected to the ring and the average internodal distance is 20 m, how many slots can the ring carry? Assume a propagation speed of 2.5 × 108 m/s and that there is a 1-bit delay at each station.
-
6.5
For a token-passing ring, assume the following parameters:
No. of stations
=
50
Transmission rate
=
1 Mbps
Mean packet length
=
1,000 bits (exponentially distributed)
Length of the ring
=
2 km
Token length
=
24 bits
Header length
=
0 bit
Bit delay
=
1 bit
Propagation delay
=
5 μs/km
Calculate the mean delay of a message for exhaustive service discipline for ρ = 0.1, 0.2, …, 0.9.
-
6.6
For both constant exponential packet distributions, calculate the mean delay for a token bus LAN with the following parameters:
No. of stations
=
50
Transmission rate
=
5 Mbps
Mean packet length
=
1,000 bits
Bus length
=
1 km
Token length
=
96 bits
Header length
=
0 bit
Bit latency
=
1 bit
Propagation delay
=
5 μs/km
Try cases for ρ = 0.1, 0.2, …, 0.9 and assume exhaustive service discipline.
-
6.7
Explain how CSMA/CD protocol works.
-
6.8
Repeat problem 6.6 for the CSMA/CD protocol.
-
6.9
(a) Assuming an exhaustive service discipline, calculate the average transfer delay of a token bus with the following parameters.
No. of stations
=
40
Transmission rate
=
1 Mbps
Mean packet length
=
500 bits (exponentially distributed)
Cable length
=
4 km
Token length
=
96 bits
Header length
=
0 bit
Bit delay
=
1 bit
Propagation delay
=
2 μs/km
Traffic intensity
=
0.4
(b) Repeat part (a) for a CSMA/CD bus LAN.
-
6.10
Rework Problem 6.6 for the case of a constant packet length of 1,000 bits.
- 6.11
-
6.12
For the unslotted nonpersistent CSMA/CD, plot the throughput S versus offered local G. Take a = 0.01 and b = 5a.
-
6.13
Repeat 6.12 for slotted nonpersistent CSMA/CD.
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Sadiku, M.N.O., Musa, S.M. (2013). Local Area Networks. In: Performance Analysis of Computer Networks. Springer, Cham. https://doi.org/10.1007/978-3-319-01646-7_6
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DOI: https://doi.org/10.1007/978-3-319-01646-7_6
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