Data Communication & Computer Networks Exam: Fall 2004, Exercises of Data Communication Systems and Computer Networks

Download Data Communication & Computer Networks Exam: Fall 2004 and more Exercises Data Communication Systems and Computer Networks in PDF only on Docsity! ELE-3604: Data Communication & Computer Networks Sessional II BCE VI Fall 2004 Total Time: 1 Hr Max Score: 100 Note Q(1). What is the relationship between the following two compression schemes (2) Null Suppression and Run Length Encoding Q(2). "abcdeeeeeeeefgh" is a string how it would be represented using RLE scheme (2) Q(3). What are the key features of Morse Code? (2) • • • • Q(4). What is the purpose of data compression and what are the two major types of compression (2) Purpose: Types: a) b) Q(5). Name commonly used audio file formats and give features of any one? (1+2) Name: a) b) c) d) Features of __________ : • • • • Q(6). What is the purpose of data encryption? (3) • • • Q(7). What are the major problems with secret key encryption and how does public key encryption resolves them? (3) Problems: a) b) HOW Public Key Resolved: docsity.com Q(8). Draw the block diagram for FHSS transmitter, briefly tell what's going on there? (3+2) Q(9). In CDMA what is the multiplexing factor? (2) • Q(10) Name three mainly used guided transmission media. (1) a) b) c) Q(11) Give applications, pros and cons and characteristics of twisted pair? (4) Applications: Pros: Cons: Q(12) Draw and label various layers of co-axial cable. (2) Q(13) What are the three modes of operation for fiber optic? (2) Modes: a) b) c) Q(14) What is an antenna. Define antenna gain? (1+2) Q(15) What are three routes of wireless waves. Where does ionosphere come into play? (2+2) docsity.com Q(31) What is the problem with non-persistent CSMA? (2) Q(32) How CSMA/CD gives improved performance compared to 1-persistent CSMA? (2) Q(33) What back-off mechanism is used in CSMA/CD and what is the advantage? (2) Q(34) What is the minimum length of IEEE 802.3 frame (header + data)? (2) Q(35) Why minimum frame size for Gigabit ethernet is 4096 bits compared to 512 bits for fast ethernet? (2) Q(36) IEEE 802.5 Token Ring: suppose there are 6 nodes (A,B,C,D,E,F) in the ring. node "A" wants to send some data to "E". What will be the sequence of events? (3) Q(37) Why DQDB is named so? Please mention key terms of this MAN technology to answer the question (3) Q(38) What is the disadvantage of "flooding" routing scheme. Where it can be useful? (2) docsity.com Q(39) You have already seen this network in the class, please create a routing table for node 3. Use: Dijkstra's Algorithm if your registration number is even Bellman Ford Algorithm if your registration number is odd Show all steps involved from the point router comes to life to the point it has gathered complete routing information (10) docsity.com