High Speed Networks questions

B.E./B.TECH DEGREE EXAMINATIONS

MODEL EXAM - OCTOBER, 2013

ECE-VII SEMESTER

CS2060-HIGH SPEED NETWORKS

        TIME:  3 Hrs                                                              MAX. MARKS: 100   

Answer ALL Questions  

PART- A (10 x 2 = 20 Marks)

1.  List and explain the types of frame relay messages.

2.  List the functions provided by AAL ¾ layer.

3.  State the key characteristics to be considered for deriving the analytic

     equations for the queuing model.

4.  Why congestion occurs in the networks?

5.  What is meant by credit allocation scheme?

6.  Define exponential RTO back off.

7.  What is meant by FQ?

8.  State and explain the types of PHBs for differentiated services.

9.  List the various reservation attributes and styles of the RSVP protocol in detail.

    10. What is meant by traffic engineering?

PART- B (5x16=80 Marks)

  11. (a) i). With a neat sketch explain the various fields of an ATM cell.                         (10)

             ii) Discuss the various non-real time ATM services.        .                                     (6)

                                                                 OR

        (b) i) Explain the fiber channel protocol architecture in detail.                                  (10)

             ii) Give the requirements of wireless LAN in detail.                                              (6)

 12.  (a) i) Explain various congestion control mechanisms used in

                  packet switching networks.                                                                               (8)

            ii) List and explain the frame relay congestion control techniques.                        (8)

                                                             OR

        (b) i) Describe the single server queuing model with its structures and parameters.  (10)                                                           

              ii) Explain the kendall’s notation and the common distributions for the

queuing model.                                                                                                   (6)

13. (a) i) Describe the TCP implementation policy details.                                                 (8)

           ii) Explain in detail about KARN’s algorithm and window management.               (8)

                                                                  OR

      (b) Discuss in detail the ways in which TCP deals with the calculation of

            retransmission timers.                                                                                               (16)

14. (a) Explain in detail about queuing disciplines: BRFQ,WFQ,GPS and PS.                 (16)                                              

                                                                   OR

      (b) i) Explain the integrated services architecture and the QoS support functions.       (8)

            ii) List and explain the various service categories in ISA.                                         (8)

15. (a) Explain the design goals and characteristics of the resource reservation

            Protocol (RSVP) in detail. Also explain data flow and protocol mechanism.          (16)

                                                               OR  

      (b) Explain the Real-time Transport Protocol architecture and draw its header format.(16)

B.E./B.TECH DEGREE EXAMINATIONS

ECE-VII SEMESTER

CS2060-HIGH SPEED NETWORKS

        TIME:  3 Hrs                                                           DATE:                                                                                                                         MAX.MARKS: 100   

Answer ALL Questions  

PART- A (10 x 2 = 20 Marks)

1.  What is ATM?

2.  What is meant by SAR and CS?

3.  Draw the diagram for ATM layers.

4.  What is VPI and VCI?

5. List the services provided by ATM.

6. Write Little’s formula.

7. Define traffic intensity and QoS.

8. What is Choke packet?

9. Define arrival rate and service rate.

10. What is the difference between committed burst size (Bc) and excess burst size (Be)?

PART- B (5x16=80 Marks)

  11. (a) i). With a neat sketch explain the various fields of an ATM cell                         (10)

             ii) Discuss the various non-real time ATM services                                              (6)

                                                                 OR

        (b) Explain Wireless LAN in detail.                                                                          (16)

 12. (a) Explain AAL in detail with neat diagrams.                                                           (16)

                                                             OR

       (b) Explain the following high speed LANs.

               i) Fast Ethernet                                                                                                     (8)

               ii) Gigabit Ethernet                                                                                               (8)

13. (a) i) Draw and explain ATM protocol architecture                                                      (8)

           ii) Explain the ATM logical connections in detail.                                                   (8)

                                                                  OR

      (b) Brief and explain Frame relay networks.                                                                (16)

14. (a) Explain the Queuing models in details                                                                    (16)

                                                                   OR

      (b) i) Explain in detail various congestion control techniques.                         (8)

            ii) List and explain the Frame relay congestion control techniques.                        (8)

15. (a) At an ATM machine in a super market, the average length of a transaction is 2 minutes, and an average customers arrive to use the machine once every 5 minutes. How long is the average time that a person must spend waiting and using the machine? What is the 90^th percentile of residence time? On average how many people are waiting to use the machine? Assume M/M/1.                    (16)

                                                               OR  

       (b) Messages arrive at a switching center for a particular outgoing communications line in a poisson manner with a mean arrival rate of 180 messages/hour. Message length is distributed exponentially with a mean length of 14,400 characters. Line speed is 9600 bps.

         a. What is the mean waiting time in the switching center?                                          (6)

         b. How many messages will be waiting in the switching center for transmission on the average?

                                                                                                                 (10)

B.E./B.TECH DEGREE EXAMINATIONS

CIAT - II SEPTEMBER, 2013

ECE-VII SEMESTER

CS2060-HIGH SPEED NETWORKS

        TIME:  3 Hrs                                                               DATE:  06-09-2013                                                                                                                              MAX.MARKS: 100   

Answer ALL Questions  

PART- A (10 x 2 = 20 Marks)

1.  What are the advantages of sliding window protocol?

2.  Why is retransmission strategy essential in TCP?

3.  Define the relationship between throughput and window size.

4. What are the types of retransmit policy?

5. Define cell delay variation.

6. What are the requirements for inelastic traffic?

7. State the drawbacks of FIFO queuing discipline.

8. What is global synchronization?

9. Distinguish between inelastic and elastic traffic.

10. Define the format of DS field.

PART- B (5x16=80 Marks)

  11. (a) i). Explain TCP flow and congestion control.                                                      (10)

             ii) Explain retransmission timer management techniques.                                     (6)

                                                                 OR

        (b) Explain Window management techniques in detail.                                             (16)

 12.  (a) i) Explain the congestion control mechanism in ATM networks.                        (10)

            ii) Explain ATM traffic control in detail.                                                                (6)

                                                             OR

        (b) i) What are the requirements for ATM traffic and congestion control?               (10)                                                           

              ii) Explain ATM traffic related attributes.                                                             (6)

13. (a) Explain in detail ABR traffic management                                                            (16)

                                                                  OR

      (b) Explain in detail GFR traffic management                                                             (16)

14. (a) Explain Integrated Services Architecture and give details about its components. (16)                                              

                                                                   OR

      (b) i) Explain the services offered by ISA.                                                                    (8)

            ii) Define Differentiated Services                                                                            (8)

15. (a) Explain various queuing discipline in ISA                                                              (16)

                                                               OR  

      (b) Explain Random Early Detection algorithm.                                                          (16)