Computer Networks (Unit wise Questions)

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1 Unit I Unit II 1. What are different transmission modes?[4] 2. Encode the following binary data stream into Manchester and differential Manchester codes [8] 3. What are different topologies [4] 4. Explain different components required for wireless Network[4] 5. What is need of Access Point in wireless Network[4] 6. Explain TCP/IP Reference Model [8] 7. Explain OSI reference model [8] 8. Compare TCP/IP and OSI model [6] 9. Explain fiber optics modes of propagation. [8] 10. List and write the use of different network connecting devices. [8] 11. What is switch? Explain difference between manageable and non manageable switch.[ 8] 12. Describe the network components (Connectors, Hubs, Switches, Repeaters, and bridges) [6] 13. Explain various internetworking devices. State at which layer that work?[8] 14. Compare between Hub and Switch.[4] 15. Explain working of Hubs, Switches and Routers. [6] 16. Differentiate between Bridge, Router and Switches. [6] 17. Explain the types of frequency hopping. [8] 18. Give brief description of 1. Twisted Pair Cable 2. Co-axial cable 3. Fiber Optic cable [8] 1. Illustrate various services offered by data link layer. [5] 2. What are different framing methods available? Explain any one in detail. 3. If all the physical links were to provide the reliable delivery service, would the TCP reliable delivery service be redundant? Yes/No? Justify. [5] 4. Compare and contrast between HDLC and PPP.[5] 5. Explain PPP with phase diagram for bringing a live up[8] 6. Explain the working of PPP. It is based closely on HDLC which uses bit stuffing to prevent accidental flag bytes within the payload from causing confusion? Give reason why PPP uses character stuffing instead?[8] 7. What is the overhead to send an IP packet using PPP? Count only the overhead introduced by PPP itself, not the IP header overhead.[5] 1

2 8. Explain the sliding window protocol [4] 9. Explain Go-back-n protocol with neat diagram.[4] 10. Explain various methods of framing in data link layer. [8] 11. Explain in brief pure ALOHA, slotted ALOHA [6] 12. Explain CSMA/CD. [4] 13. Write the problems in static and dynamic channel allocation. [6] 14. Explain persistent and non-persistent CSMA. [4] 15. Explain Go back N Protocol? What are demerits of this Protocol? 16. What is difference between Go-back-n and selective repeate. 17. Explain Framing Method of DLL? 18. Explain in detail HDLC Frame Format and its control fields? 19. Explain the different frame formats for HDLC.[8] 20. Calculate CRC for the frame and generator polynomial is x 4 +x What is the transmitted frame? 21. Received code word is , divisor is 10101, find the received frame is correct or not? 22. Generate the hamming code for data (Assume even Parity). 23. If 7-bit hamming code word is received by a receiver is , assume the even parity state whether the receiving code word is correct or wrong? If wrong locate the bit in error. 24. In stop & Wail Protocol define & discus the handling of a)damaged Frame b)lost Frame Unit III: 1. Differentiate between Wireless LAN(Wifi-802.3) and Bluetooth(802.15) 2. Differentiate between Bluetooth(802.15) and WiMAX(802.16) 3. Differentiate between different IEEE standards(a/b/g/n/ac/ad) 4. Draw and explain a frame format for IEEE Draw and explain a frame format for IEEE Draw and explain a frame format for IEEE Draw and explain a frame format for IEEE Binary Exponential Backoff Algorithm Architecture 10. What is Hidden station and Expose station problem in WLAN. 11. Explain need of NAV. 12. Explain the working of DCF and PCF? 13. Explain Bluetooth Architecture(Piconet and Scatternet) 14. Explain Bluetooth(802.15) Protocol Stack 15. Explain protocol stack 2

3 16. Compare pure and slotted ALOHA. 17. What is pure ALOHA and slotted ALOHA? Consider the delay of both at low load. Which one is less? Explain your answer. 18. Explain in detail CSMA Protocol in detail. Unit IV: 1. Explain network layer issues in detail. [8] 2. Draw and Explain IPv4 header format?[8] 3. What are different features of IPV6?[6] 4. What are different types of addresses in IPV6?[6] 5. Explain address representation in detail of IPV6.[6] 6. How routing is done in Mobile IP?[6] 7. Draw and Explain IPV6 header. Explain the significance of extension header. [8] 8. Describe in short the importance and working of ARP protocol? What is ARP cash.[8] 9. What is significance of priority and flow label fields in IPV6? [8] 10. Compare IPv6 and IPv4. Draw and explain IPv6 header format.[8] 11. Explain different types of messages in ICMP v6. [6] 12. Compare IP and ICMP. Explain header format of ICMP v6 protocol.[8] 13. Describe in brief ICMP error and query messages(at least 2 each) [8] 14. Identify class, subnet mask, network address and broadcast address of following IP Address: 1) ) ) ) [8] 15. How do IP addresses get mapped onto data link layer addresses, such as Ethernet?[8] 16. Classify routing algorithms.[4] 17. Compare link state and distance vector routing algorithm.[4] 18. What is path vector routing? Discuss its advantages over Distance Vector routing.[8] 19. Explain routing protocols RIP and BGP. [8] 20. Explain in detail OSPF protocol. [8] 21. Write short note on BGP.[4] Unit V 1. Differentiate between TCP and UDP protocol. Also comment on the applications supported by them.[6] 2. Explain pros and cons of TCP over UDP [4] 3. Explain SCTP packet with header in detail.[8] 4. Compare SCTP,TCP and UDP[6] 3

4 5. Compare SCTP and TCP [8] 6. Explain in detail different features of SCTP[8] 7. Is TCP the appropriate protocol model for wireless networks? Issues in TCP over wireless[4] 8. What are different protocols/schemes for wireless TCP? Explain any one in detail.[8] 9. Comment on type of ports? What is the range of port numbers used in each type.[6] 10. Explain flow control in TCP. [6] 11. Explain significance of following flags in TCP header SYN,RST,FIN,PSH.[6] 12. Explain Three- way handshake in TCP[4][8] 13. Explain 4 scenarios for Connection release[8] 14. Explain what will happen if transport layer is removed from TCP/IP protocol stack?[4] 15. Explain TCP congestion control algorithm with respect to additive-increase, multiplicative decrease, slow start mechanism and reaction to timeout events[8] 16. What is silly syndrome problem? Suggest two solutions to overcome the problem [8] 17. Define threshold condition in congestion. How does TCP tackle congestion problem using internet congestion control algorithm?[8] 18. Explain Two -army problem [6] 19. What are the problems that the TCP may face with the emergency of high speed networks and how can these be addressed?[8] 20. What is 3-Way handshake in TCP? Explain in brief why it is required?[6] 21. Draw UDP header structure, Explain significance of each field in UDP header. What is pseudo-header?[6] 22. Explain RTP protocol in detail with header format.[8] 23. Explain multiplexing and de-multiplexing in transport layer.[6] 24. UDP does not guarantee reliability in data transfer but delivered data is error free Justify this statement.[6] 25. What is socket? List and explain various socket primitives required in TCP socket program on client and server side.[6] 26. Write a pseudo code for client and server to setup a connectionless service between them[8] 27. State which transport layer protocol is used by the following protocols HTTP,FTP,DHCP,DNS,ICMP,TFTP,IP,SMTP[4] 28. What is QoS? Explain QoS parameters.[8] 29. What is QoS(Quality of Service)? Explain various parameters for QoS in a network.[5] 30. Differentiate between class based and flow based QoS. Explain differentiated services for QoS[ 8] 4

5 31. Explain leaky bucket algorithm, which quality parameter is ensured by Leaky Bucket algorithm.[5] 32. What is traffic shaping? How it is used in congestion control?[5] 33. What are the techniques for achieving good quality of services in the network layer?[8] 34. Describe metrics measuring QoS[8] 35. Describe any link scheduling algorithm.[8] 36. Describe in brief Integrated Services and Differentiated services.[8] 37. Explain significance and working of RSVP protocol. [8] 38. Explain recourse reservation protocol in detail.[8] Unit VI 1. Compare file transfer using FTP and HTTP methods.[8] 2. Compare FTP and TFTP and explain four commands of each.[9] 3. Explain FTP in details. 4. What is DNS? Explain with suitable example how query resolving process is done?[8] 5. What is name server? How does caching increases the efficiency of name resolution?[6] 6. What is DNS? Explain its various resource records with one example[8] 7. Can a computer has two DNS names that fall into two different level domains. If so give an example. If not explain why not?[6] 8. What is DNS? Explain with suitable example process of delivering of requested web page on your computer?[8] 9. Write short note on SMTP and Caching in web browser[12] 10. State and explain different protocols used for . Differentiate between IMAP, POP3 and SMTP protocol.[8] 11. Compare file transfer using SMTP and HTTP methods.[8] 12. What is difference between persistent and non persistent HTTP? Also explain HTTP message format [8] 13. Explain working of DHCP. 14. Explain working of TELNET. 15. Assume that you are accessing a web page through a browser on a computer. Explain step by step various things that happen at various layers on client side. Assume both uses TCP/IP protocol stack. [8] 16. Explain in brief functionality of Web server, Proxy server, Mail Server.[8] 17. What is internet? Explain protocol layers & service model in the Internet in detail.[8] 5

6 18. Consider you are accessing a web page. Explain what different things happen at client and server side, at each layer. Assume that both are using TCP/IP protocol stack[8] 19. Explain connection oriented and connectionless service. Which protocols at each layer in TCP/IP protocol suite support these services[8] 20. Explain TCP/IP Reference Model [8] 21. Explain OSI reference model [8] 22. Compare TCP/IP and OSI model [6] 6

5105: BHARATHIDASAN ENGINEERING COLLEGE NATTARMPALLI UNIT I FUNDAMENTALS AND LINK LAYER PART A

5105: BHARATHIDASAN ENGINEERING COLLEGE NATTARMPALLI 635 854. NAME OF THE STAFF : R.ANBARASAN DESIGNATION & DEPARTMENT : AP/CSE SUBJECT CODE : CS 6551 SUBJECT NAME : COMPUTER NETWORKS UNIT I FUNDAMENTALS