SRM University 2007 B.Tech Computer Science and Engineering Bank : CS309 Computer Networks - Question Paper

15.16 bit messages are transmitted using a hamming code .How many check bits are needed to ensure that the reciever can detect and accurate single bit errors.
Show the bit trend transmitted for the message 10101111 using an even parity hamming code.
16. A 12-bit Hamming code whose hexadecimal 0x E4F arrives at the reciever. What was the original value in hexadecimal . presume that there is only 1 errror.




UNIT III
PART - A


1. What are Multi access channels / random access channels?
2. What is the purpose of MAC sublayer?
3. What is Station Model?
4. Define Collision
5. Define Contention Systems
6. Define Aloha Systems
7. Define Slotted Aloha
8. What are Carrier Sense protocols?
9. What are Non persistent CSMA?
10. What is I- persistent CSMA?
11. What is p- persistent CSMA?
12. What is CSMA/CD?
13. Define Basic bitmap method
14. Give two examples for CSA protocols
15. Give two examples for Collision free protocols
16. What are Reservation protocols?
17. What is Binary Countdown?
18. What are Limited contention protocols?
19. Define Dense wavelength Division multiplexing
20. What is Hidden station problem?
21. What is Exposed station problem?
22. What is the Basic idea behind Multiple Access with Collision Avoidance (MACA)?
23. Compare thin and thick Ethernet.
24. What is Time domain reflectometry?
25. What are the three types of Ethernet cabling?
26. What are the various cable topologies?
27. Differentiate Manchester encoding and differential Manchester encoding
28. What are the three types of Ethernet cabling with diagram?
29. What are the three traffic classes supported by WDMAP?
30. Differentiate hidden station issue & exposed station issue
31. What is a Repeater?
32. Short notes on binary exponential back of algorithm.
33. What is Frame bursting
34. Give the position of LLC in the protocol stack & also provide its protocol format.
35. What is Fragment burst?
36. What are the two modes of operation supported by 802-11
37. Sketch the Manchester encoding for the bit stream 0001110101


38. Define :
a) hub
b) bridge
c) switch
d) router
e) gateway

39. Use of remote bridges
40. Write the congestion / prevention policies in transport / network & DLL layer.
41. What is load shedding
42. Differentiate token bucket & leaky bucket algorithm.
43. What is Multiprotocol router
44. What is tunneling
45. What is Segmentation
46. Give five kinds of OSPF messages

Earning:   Approval pending.