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# SOLUTIONS of CCN 15EC64 by JAYAPRASAD KM

• Computer Communication Network - CCN
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INTRODUCTION, NETWORK MODELS, DATA LINK 15EC64 LAYER COMPUTER COMMUNICATION NETWORKS [CCN] 15EC64 INTRODUCTION, NETWORK MODELS, DATA LINK LAYER MODULE 1 QUESTIONS and PROBLEMS SOLUTIONS REFERENCE TEXT BOOK: Data Communication and Networking, Behrouz A. Forouzan;5TH Edition Chapter 1, 2, 9 and 11 PREPARED BY : JAYAPRASAD K M EMAIL: jayaprasadkm@gmail.com LINKEDIN: www.linkedin.com/in/jayaprasadkm E L COMPUTER ECTRON COMMUNICATION I C S A N D CNETWORKS O M M U N I C A T I O N D E P A R TPage M E 1N T

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MODULE 1 PROBLEMS AND solution 15EC64 CONTENTS 1 2 3 INTRODUCTION 1.1 Exercise Questions 1.2 Exercise Problems 1.3 Answers for Exercise Questions of 1.1 1.4 Solution for Exercise Problems of 1.2 NETWORK MODELS 2.1 Exercise Questions 2.2 Exercise Problems 2.3 Answers for Exercise Questions of 2.1 2.4 Solution for Exercise Problems of 2.2 DATA LINK LAYER 3.1 Exercise Questions 3.2 Exercise Problems 3.3 Answers for Exercise Questions of 3.1 3.4 Solution for Exercise Problems of 3.2 COMPUTER COMMUNICATION NETWORKS 2 2 4 6 8 9 9 11 15 17 21 21 26 34 38 Page 1

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MODULE 1 PROBLEMS AND solution 15EC64 PART 1 INTRODUCTION 1.1 QUESTIONS Q1-1. Identify the five components of a data communications system. Q1-2. What are the three criteria necessary for an effective and efficient network? Q1-3. What are the advantages of a multipoint connection over a point-to-point one? Q1-4. What are the two types of line configuration? Q1-5. Categorize the four basic topologies in terms of line configuration. Q1-6. What is the difference between half-duplex and full-duplex transmission modes? Q1-7. Name the four basic network topologies, and cite an advantage of each type. Q1-8. For n devices in a network, what is the number of cable links required for a mesh, ring, bus, and star topology? Q1-9. What are some of the factors that determine whether a communication system is a LAN or WAN? Q1-10. What is an internet? What is the Internet? Q1-11. Why are protocols needed? Q1-12. In a LAN with a link-layer switch (Figure 1.1), Host 1 wants to send a message to Host 3. Since communication is through the link-layer switch, does the switch need to have an address? Explain. COMPUTER COMMUNICATION NETWORKS Page 2

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MODULE 1 PROBLEMS AND solution 15EC64 Figure 1.1 An isolated LAN in the past and today Q1-13. How many point-to-point WANs are needed to connect n LANs if each LAN should be able to directly communicate with any other LAN? Q1-14. When we use local telephones to talk to a friend, are we using a circuit- switched network or a packet-switched network? Q1-15. When a resident uses a dial-up or DLS service to connect to the Internet, what is the role of the telephone company? Q1-16. What is the first principle we discussed in this chapter for protocol layering that needs to be followed to make the communication bidirectional? Q1-17. Explain the difference between an Internet draft and a proposed standard. Q1-18. Explain the difference between a required RFC and a recommended RFC. Q1-19. Explain the difference between the duties of the IETF and IRTF COMPUTER COMMUNICATION NETWORKS Page 3