networking, computer science homework help

User Generated

cnaxnwfnhenou87

Computer Science

Description

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)

User generated content is uploaded by users for the purposes of learning and should be used following Studypool's honor code & terms of service.

Explanation & Answer

Hallow there..Here is the completed assignmentHave a thorough look at it and let me know of any changes or explations if needed

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)
Merits of star topology
Contributes in monitoring network central management
Easy to add and remove new nodes without affecting performance of the entire network.
The sends signals are transmitted directly to the intended destination.
Demerit of star topology
Use of the switch or additional routers increases the total cost of the network
Performance of the star topology depends on the central device capacity
Merit of bus topology
It’s a low cost topology compared to other topology
Easy to develop and to set up bus topology extensions
Require least amount of cables to set up
Demerits of Bus topology
Bus topology offer less security due to transmission of signals from the source to all computers
Its maintence cost get higher with passing of time
Contains a limitation to the quantity of nodes that can be added to the network
Troubleshooting is not effective in detecting fault in bus topology
Merits of Mesh topology

Can be expanded without causing major changes to the other nodes performance
Mesh topology can withstand high content traffic.
A failure to the Mesh topology does not destroy or affecting the data

Example of mesh topology
Wave Relay and Firetide

Full Mesh and partial mesh Topology
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)

Encapsulation involves wrapping, hide and protect useful data from any probable interference of
misuse at the same time it makes the utilization of the system easy by packeting data that can be
used by other systems. The process start from the topmost layer called application layer to the
lowest layer referred as the physical layer and put data in the form that protocol can understand to
enable it to arrange the data into different interfaces. While, decapsulation is exact reverse of the
encapsulation process by unlocking and opening packaged data. It start from the physical layer to
the application layer which is the uppermost layer. It makes the required data available to the users.

Multiplexing is a many-to-one process.
Multiplex...


Anonymous
Just what I needed. Studypool is a lifesaver!

Studypool
4.7
Trustpilot
4.5
Sitejabber
4.4

Related Tags