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IT210Assignment3.docx|
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Question Three |
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Assignment 3
Deadline: Wednesday 28/11/2018 @ 23:59
[Total Mark for this Assignment is 6]
Computer Networks
IT210
College of Computing and Informatics
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Question One
2.75 Marks
Learning Outcome(s):
Demonstrate protocol configuration, network-addressing schemes and analyze packet transmission.
An organization is assigned the IP address 14.24.75.0/26. The organization needs two subblocks: the first subblock with 15 devices, and the second one with 10 devices. Address space of the first subblock follows the address space of the second subblock.
a) What is the first address of the first subblock?
b) What is the last address of the first subblock?
c) What is the total number of addresses in the first subblock?
d) What is the first address of the second subblock?
e) What is the last address of the second subblock?
f) What is the total number of addresses in the second subblock?
g) What is the network address of the first subblock?
h) Can we add a third subblock with 44 devices? Explain.
Show or explain how to get your answers. Final answers should be in decimal dotted notation.
* Do not provide any drawings/figures in your answers. Otherwise your work is awarded a zero mark.
Question Two
2 Marks
Learning Outcome(s):
Demonstrate protocol configuration, network-addressing schemes and analyze packet transmission.
Based on the figure below, fill out the following routing tables using OSPF routing protocol.
R2 Forwarding Table R3 Forwarding Table
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Destination Network |
Next Router |
Cost |
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N1 |
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10 |
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N2 |
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4 |
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N3 |
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6 |
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N4 |
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9 |
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Destination Network |
Next Router |
Cost |
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N1 |
R2 |
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N2 |
R2 |
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N3 |
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N4 |
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Question Three
0.75 Marks
Learning Outcome(s):
Recognize the layered approach for networking.
Reliability can be achieved by adding error control services to the transport layer. What are the responsibilities of the error control at the Transport layer? List three responsibilities.
Question Four
0.5 Marks
Learning Outcome(s):
Illustrate network protocols including Transport Control Protocol / Internet Protocol.
There are different transport layer protocols including Stop-and-Wait, GBN, and SR.
1) How efficiency is improved in GBN compared to Stop-and-Wait?
2) How efficiency is improved in SR compared to GBN?
