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CSC02B2 2021 ST1 - Semester Test 1
Computer Science (CSC1B)
University of Johannesburg
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FACULTY OF SCIENCE
ACADEMY OF COMPUTER SCIENCE AND SOFTWARE ENGINEERING
MODULE CSC2B10/CSC02B
COMPUTER SCIENCE 2B
CAMPUS AUCKLAND PARK CAMPUS (APK)
ASSESSMENT SEMESTER TEST I
DATE: 2021-10-31 SESSION: 14:00 - 15:
ASSESOR(S): ME T. MOODLEY
MS M. FOURIE
MODERATOR: DR J. DU TOIT
DURATION: 90 MINUTES MARKS: 75
Please read the following instructions carefully:
Downloading and Reading time: 14:00 - 14:
Writing time: 14:10 - 15:
Upload time: 15:40 - 16:10 (No extra time will be awarded)
Test support is available on Discord: discord/fhe359ZEkq
Answers may be typed or hand-written and photographed.
Where possible, provide answers in the form of a list.
Where possible, upload your submission as a single PDF document.
Please DO NOT compress (ZIP, RAR, etc.) your submission.
Write cleanly and legibly.
You may use a non-programmable calculator to answer the questions.
This paper consists of 5 pages.
Upload all of your answers before the close of the submission time at 16:
Computer Science 2B Semester Test I 2021-10-
N2 N1 N
N
N
N
N
N
N
N
N
N
2Mbps
12Mbps
20Mbps
14Mbps
30Mbps
24Mbps
100Mbps
50Mbps
1Mbps 2Mbps
1Mbps
It is also determined that the distances between the nodes are as follows: (Please note that all working out must be shown, failure to do so may result in the student receiving zero for the question)
N1-N2: 24km
N1-N3: 36km
N1-N4: 12km
N4-N5: 14km
N3-N6: 32km
N6-N7: 28km
N7-N8: 88km
N6-N9: 62km
N9-N10: 98km
N10-N11: 4km
N11-N12: 2km
Answer the questions that follow: (a) Determine the approximate transmission rate when communicating between N5 [1] and N. (b) long (in seconds) will [2]Taking this approximate transmission rate into account, how it take to transfer a 36 Megabyte file from node N5 to N9? (c) propagates a signal [3]If it is determined that the medium installed in this network at a speed of 120 000 km/s. Calculate the propagation delay for communications between N5 to N9. (ROUND OFF TO SECOND NEAREST DECIMAL) (d) [4]Assuming that there is a nodal processing delay of 0 seconds and a queuing delay of 0 seconds, what will be the total time taken to transfer a 42 Megabyte file from from N5 to N9? Total: 10
QUESTION 3
(a) application layer consists of various architectures that facilitate the transfer of [9]The data between a host and server. Each architecture has advantages and disadvantages. List and describe each of these architectures along with one advantage and one disadvantage for each architecture.
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Computer Science 2B Semester Test I 2021-10-
(b) End System and Server. Using a diagram [6]The image below is an example of a illustrate the manner in which a non-persistent connection would occur between the End System and Server shown below. Assume that the user enters the URL: uj.ac/faculties/science/Pages/Departments.aspx.
Total: 15
QUESTION 4
(a) [8]Using the diagram provided below, discuss the manner in which a DNS name resolu- tion would make an iterated query. uj.ac is communicating with gaia.cs.umass , describe steps 1-
(b) [2]What does the transport services and protocols in a network provide? Total: 10
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Computer Science 2B Semester Test I 2021-10-
39 writeCommand(message); 40 ( E (2 marks) ) 41 readResponse (); 42 ( F (2 marks) ) 43 } 44 public static void main(String [] args) { 45 String server = "smtpmail.csc2b.uj.ac"; 46 SMTPClient client = new SMTPClient(server , ( G (1 mark) ) ); 47 client("Romeo","Juliet","It is the East , and Juliet is the sun"); 48 client (); 49 } 50 }
Total: 10
The End!
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CSC02B2 2021 ST1 - Semester Test 1
Course: Computer Science (CSC1B)
University: University of Johannesburg
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