networking, computer science homework help

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Task

Provide
short answers to the following six questions. Your answers should be
clear, concise and to the point. Prepare a single document (MS Word or
PDF, NOT both) along with title page and submit it online using
Turnitin.

Question 1: Discuss the advantages and disadvantages of star, bus, and mesh physical topologies. Provide real examples of each type. (5 marks)

Question 2:
Explain encapsulation and decapsulation in a five layer TCP/IP protocol
suite. How does multiplexing and de-multiplexing differ from
encapsulation and decapsulation? (5 Marks)

Question 3: Calculate the approximate bit rate and signal level(s) for a 6.8 MHz bandwidth system with a signal to noise ratio of 132. (5 Marks)

Question 4:
Explain why the OSI model is better than the TCP/IP model. Why hasn’t
it taken over from the TCP/IP model? Discuss the advantages and
disadvantages of both models. (5 Marks)

Question 5: What
is the total delay (latency) for a frame of size 5 million bits that is
being sent on a link with 10 routers each having a queuing time of 3.5
µs and a processing time of 1.8 µs. The length of the link is 1900 km,
the speed of light inside the link is 2.2 x 108 m/s, the link has a
bandwidth of 8 Mbps. Which component(s) of the total delay is/are
dominant? Which one(s) is/are negligible? (5 Marks)

Question 6:
According to RFC1939, a POP3 session is one of the following states:
closed, authorization, transaction or update. Draw a diagram and explain
to show these four states and how POP3 moves between them. (5 Marks)