University of Johannesburg

• ACSSE 3A

• FACULTY OF SCIENCE ACADEMY OF COMPUTER SCIENCE AND SOFTWARE ENGINEERING MODULE CSC2B10/CSC02B2 COMPUTER SCIENCE 2B CAMPUS AUCKLAND PARK CAMPUS (APK) ASSESSMENT SEMESTER TEST I DATE: 2018-09-04 SESSION: 14:00 - 15:30 ASSESOR(S): PROF D.T. VAN DER HAAR MODERATOR: MR A. MAGANLAL DURATION: 90 MINUTES MARKS: 75 Please read the following instructions carefully: 1. Answer all the questions 2. Write cleanly and legibly. 3. You may use a non-programmable calculator to answer the questions. 4. This paper consists of 4 pages. This study source was downloaded by 100000870482763 from CourseHero.com on 08-23-2023 15:40:48 GMT -05:00 https://www.coursehero.com/file/209887403/ACSSE-CSC2B10-2018-ST1pdf/ Computer Science 2B Semester Test I 2018-09-04 QUESTION 1 (a) Define what a protocol is. List two (2) examples of well-known protocols. [4] (b) Discuss the differences between circuit-switched networks and packet-switched [4] networks. (c) According to the table below, provide an appropriate description for each property [4] under the appropriate column. (1 mark for each description) Write down the letter and the correct answer next to it. e.g. (f) Foo Type of network DSL Wide-Area (Cellular) Directionality of Medium (a) Unguided Material of Medium (b) (c) Transmission speed <2.5 Mbps upstream <24 Mbps downstream (d) (d) Define the following concepts within the context of data communications: [3] 1. FTTH 2. HFC 3. RFC Total: 15 QUESTION 2 Assume there is a fiber network with 5 nodes (N1, N2, N3, N4 and N5) and the transmission rates between these nodes are as follows: N1