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1 SHIRDI SAI ENGINEERING COLLEGE
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12 USN SHIRDI SAI ENGG COLLEGE Seventh Semester D.E. Degree Examination, December 2010 Computer Communication Networks 06EC71 Time: 3 hrs. Note: Answer any FIVE full questions, selecting at least TWO questions/rom each part. Max. Marks:l00 1 PART-A a. What are the levels of addresses that are used In an internet, employing protocols? b. What are different types of services provided by telephone networks? c. Name the major components of a telephone network. the TCPIIP (10 Marks) (06 Marks) (04 Marks) 2 3 a. Explain the stop-and-wait protocol, for noisy channels. (10 Marks) b. What are the three types of frames in HDLC protocol? Explain each of them briefly. (10 Marks) a. Explain pure ALOHA protocol. (06 Marks) b. Pure ALOHA network transmits 200-bit frames on a shared channel of 200 Kbps. What is the throughput if the system produces: i) 1000 frames/see ii) 500 frames/see iii) 250 frames/see? (04 Marks) c. Discuss the three controlled access methods. (10 Marks) 4 a. Explain the goals, MAC sub layer and physical layer of the fast Ethernet b. Explain briefly the baseband layer in the Bluetooth layers. (10 Marks) (!O Marks) PART-a 5 a. Explain briefly the three criteria of the transparent bridge. b. Explain virtual LANs systems. 6 a. Find the class of the following IP addresses: i) ii) iii) iv) b. What is NA T? How can NAT help in address depletion? c. Explain IPV 6 addresses. 7 a. Explain the path vector routing, for an interdomain system. b. Explain the Core-Based Tree (CBT). (10 Marks) (10 Marks) {04 Marks) (06 Marks) (lo Marks) (10 Marks) (10 Marks) ~ o Z ~ o0-. 8 Write short notes on any TWO of the following: a. UDP b. TCP c. DNS * * * * * (20 Marks)
13 - SHIRDI SAI ENGG COLLEGE USN EC73 Time: 3 hrs. Seventh Semester B.E. Degree Examination, December 2010 Computer Communication Network Note: Answer any FIVE full questions. Max. Marks:l00 1 a. Explain the TCPIIP reference model. b. Why does ATM use small fixed length cells? Explain ATM reference model. c. What are the two reasons for using layered network architecture? (08 Marks) (08 Marks) (04 Marks) 2 a. Mention the guided and unguided transmission media. Explain the fiber optics networks. (08 Marks) b. Compare the maximum data rate of a noiseless 4 KHz channel using i) Analog encoding with 2-bits per sample ii) The T I PCM system. (04 Marks) c. Differentiate between the circuit switching and packet switching with the help of timing of events. (08 Marks) 3 a. Explain the design issues of data link layer. (06 Marks) b. What is piggybacking? Explain sliding window protocols. (07 Marks) c. A channel has bit rate of 4 kbps and a propogation speed of 20 msec. For what range of frame size, does stop and wait give an efficiency of atleast 50 percent? (07 Marks) 4 a. Measurements of slotted Aloha channel with an infinite number of users show that 10% of slots are idle. i) What is the channel load G? ii) What is the throughput? iii) Is the channel underloaded or overloaded? (06 Marks) b. Explain the ethernet MAC sublayer protocol. (06 Marks) c. Describe the services of (08 Marks) 5 a. Differentiate between static and dynamic routing. Explain distance vector routing. (08 Marks) b. What is congestion? What is the need of congestion control? Explain anyone congestion control technique. (06 Marks) c. Explain the issues of network layer design. (06 Marks) 6 a. Differentiate between repeaters, hubs, bridges, switches and routers. (10 Marks) b. Differentiate between IPv4 and IPv6. (06 Marks) c. Convert IP address whose hexadecimal representation is C22F15B2 into dotted decimal notation. (04 Marks) Q) o z... c: ro t: oco.. 7 a. Describe struecture and various fields of i) TCP header and ii) UDP header. (08 Marks) b. What is WWW? Explain the working ofwww, with the help of web model. (06 Marks) c. Discuss class A and class B methods of internet addressing. Mention minimum and maximum range possible with these types of addressing. (06 Marks) 8 Write short notes on : a. Bluetooth technology b. QOS c. SMTP d. Address resolver in DNS. (20 Marks) * * * * *
14 Seventh Semester B.E. Degree Examination, May/June 2010 Computer Communication Networks Note: Answer any FIVE full questions, selecting at least TWO questionsfrom each part. 1 a. Explain OSI model, with a neat block diagram. Consider a source, destination machine and some intermediate nodes for discussion. (10 Marks) b. How addresses employed (used) in internet employing TCP/IP protocol can be classified? (02 Marks) c. What is DSL technology? List different DSLs available. Discus salient features of ASDL. (08 Marks) 2 a. What is framing? How frames can be classified? Explain bit stuffing with the help of an example. (06 Marks) b. What is the meaning of datal ink control? Explain stop-and-wait ARQ, using a suitable block diagram. (10 Marks) c. In a stop-and-wait ARQ system the bandwidth of the line is 1 Mbps and 1 bit takes 20 ms to make a round trip. What is the bandwidth delay product? If the system data frames are 1000 bits in lengths, what is the percentage utilization of the link? (04 Marks) 3 a. A slotted ALOHA network transmits 200 bit frames using a shared channel with 200 kbps bandwidth. Find the throughput if the system produces 500 frames/sec. (03 Marks) b. A network using CSMAlCD has a bandwidth of 10 Mbps. If the maximum propagation time is 25.6 ~sec, what is the minimum size of the frame? (03 Marks) c. Explain token passing method of controlled access of the channel. (06 Marks) d. What is channelization in the context of multiple access? What are the various available channelization techniques? List the properties of orthogonal sequences used in CDMA. (08 Marks) 4 a. Explain MAC frame format. (06 Marks) b. An ethemet MAC sublayer receives 38 bytes of data from upper layer. How many bytes of padding must be added to the data? (02 Marks) c. Explain two different kinds of services as defined in IEEE (06 Marks) d. What is fast ethernet? Explain autonegotiation. What are the purposes of using this feature in design of fast ethernet. (06 Marks)
15 5 a. What are the five different categories of connecting devices, based on the layer at which they operate in a network? Explain each of them. (10 Marks) b. Differentiate between a bus backbone network and star backbone network. (06 Marks) c. Explain the concept ofvlan, in brief. (04 Marks) 6 a. What is the need of transition from IPV4 to IPV6? What are the strategies deviced by IETF to help the transition? (12 Marks) b. Find the error, if any, in the following IPV 4 addresses: i) ii) (02 Marks) c. What is classless addressing in IPV4? What is a mask? Explain. (06 Marks) 7 a. Explain Dijkstra algorithm. Apply the same to node 'A' of the graph shown in Fig.7(a) and prepare routing table for node A. (06 Marks) Fig.7(a) Topology of Network b. What is tunneling in case of multicast routing? Explain multicast backbone of routers using concept of tunneling? (06 Marks) c. Write in brief, any four applications of multicasting. (08 Marks) 8 Write short notes on any two of the following: a. UDP b. TCP segment format c. IPV 4 datagram format.
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