1. What
are the two reasons for using layered protocols?
2. What
do you mean by link to link layers of OSI reference model? Explain their
functions briefly?
3. Write
a short note on ISDN?
4. What
is the difference between boundary level masking and non- boundary level
masking? Give examples
5. Draw the IP datagram
header format. “IP datagram has a checksum field still it is called an
unreliable protocol”. Justify?
6. What
are the principles that were applied to arrive at the seven layers in OSI model?
7. Explain
the working of 3 bit sliding window protocol with suitable example.
8. Explain
the following ARQ techniques in detail
1. Stop
and wait ARQ
2. Selective
repeat ARQ
9. What
are the reasons for using layered protocols ?
10. 10 Enumerate the
main responsibilities of data link layer ?
11. Is the nyquist
theorem true for optical fibre or only for copper wire ? Explain.
12. Why do data link layer
protocols position the checksum in the trailer and not in the header ?
13. Compare the maximum
window size in go-back-N and selective-repeat ARQs.
14. Why does ATM
use the cell of small and fixed length ?
15. Give the equivalent
binary word for the polynomial x8+x2+x+1.
16. In which of the 7
layers of OSI will a service handling conversion of characters is from EBCDIC
to ASCII be normally implemented ?
17. Where is the special
IP address 127.0.0.0. used ?
18. Convert the IP
address 197.228.17.56 into binary ?
19. Compare satellite
with fiber as a communication medium and enumerate the application areas where
satellite still holds a niche(or special)marker.
20. A binary signal is
sent over a 3-khz channel whose signal-to-noise ratio is 20 db.Calculate the
maximum achievable data rate ?
21. What does ‘data
transparency’ mean ? With the help of a flow chart, explain the process of bit
de-stuffing at the receiver’s end.
22. Assuming classful
addressing, find the no of subnets and the no of hosts per subnet foe the
following blocks:
(i)
122.45.77.32/20
(ii)
A class B block having mask of 255.255.192.0
23. Write short note on any four of the
following:
(a) The ATM reference
model
(b) HDLC
(c) Salient
difference between ISO-OSI and TCP/IP models.
(d) Network
Topologies and their uses.
(e) Wireless networks.
24. (a) Differentiate between static and
dynamic channel allocation.
(b) List out the main
responsibilities of the network layer.
(c) Give two examples
of a ‘collision-free’ protocol ?
(d) Why is IP called
‘best-effort delivery’ protocol?
(e) What is a
transparent bridge?
(f) what are the two
sub layers of data link layer called ?
(g) What are the
other names of IEEE 802.11 protocol or standard?
(h) What is the baud
rate of a standard 10 mbps Ethernet LAN ?
(i) What is a minimum
data size of an Ethernet frame ?
25. Explain distance vector routing . What
are its limitations and how are they overcome?
26.Explain pure-ALOHA and slotted- ALOHA
systems.Give the expression for throughout for each,clearly explaining the
various terms.
27. Explain 1-persistent, p-persistent and
0-persistent CSMA giving strong and weak points of each.
28. Explain network equipment used in
wired-LANS and explain the function of Hub, Switch, and bridge.
29. Write short note on any four of the
following:
(a) Token ring
(b) Various fields in
Ethernet frame format
(c) Difference between
congestion control and QoS(or Quality of service)
(d) FDDI
(e) Traffic shaping
using token bucket algorithm
(f) CSMA/CD
30. If the transmitted code word is
10011000 and the received code word is 11001001. What is the error word ? Write
transmitted code word , received code word and error word as polynomials.
31.Why transport layer protocols like TCP
and UDP are called end-to-end protocols. What is the difference between them?
32. Differentiate between:
(i) Baseband co-axial cable and broad band coaxial cable
(ii) Optical fibre and twisted pair
(iii) SMTP and SNMP
33. What are the basic functions of the
data link layer? Write down the basic features of HDLC protocol? Could HDLC be used
as a data link protocol for a LAN? Justify your answer.
34. The physical layer service is a
non-confirmed service. Assume that some bits of data are lost during
transmission over physical media,which layer will detect the loss and take some
remedial measures. Explain any one method clearly depicting how this operation
is performed.
35. What are the advantages of cell
switching that is used in ATM?
36. Outline and discuss the main fields in
Ethernet IEEE 802.3 frame. What are the main objectives of preamble ?
37. What is the average number of
transmission required to send a frame of length 1600 bytes correctly, if the
bit error rate is 1 x 10-6.
38. Explain what is meant by the term
‘integrated service digital network’. Give three reasons a company might choose
an ISDN link in preference to a leased line.
39. Subnet the class C network address
198.67.25.0 into eight subnets. Why are the ‘all ones’ and ‘all zeroes’ subnets
not used ?
40.What do you understand by the term
‘structured cabling’. State the main rules that should be used when installing
a cable. Show that maximum cabling area for LAN for horizontal cabling runs is
approximately 200m.
41. What are the various classes of IP
addressing? Calculate the maximum number of class A, B and C network Ids.
42. Why is a data link layer switch
preferred over a hub ?
43. Which device is needed to connect two
LANs with different network Ids ?
44. When is a translating bridge used ?
45. Can a switch be used to connect two
LANs with different network IDs ?
46. Write two ways in which computer
applications differ from network applications ?
47. What is count to infinity problem ?
48. What was the reason for selecting a
speed of 155.52 Mbps in the original ATM standard ?
49. Contrast link state and distance
vector routing protocols, giving an example of each.
50. What is ISO-OSI reference model ?
Compare it with TCP/IP reference model. Why TCP/IP reference model is more
popular than OSI model ? Which layer is used for the following :
(i) to
route packets
(ii) to convert
packets to frame
(iii) to detect
and correct errors
(iv) to run
services like FTP, Telnet etc.
51. Discuss Shannon’s capacity. What
implications does it have ?
52. Discuss how satellite network differs
from traditional networks such as Ethernet, Tokenbus.
53. What is packet switching ? Explain two
different approaches of packet switching. ?
54. Doscuss the different factors
affecting congestion control algorithms. ?
55. How does a token ring network work ?
In what way is it different from Ethernet ?
56. Describe and distinguish between FDMA,
TDMA, and CDMA.
57. Discuss the following terms with
respect to ATM: VPI, UNI, asynchronous, AAL, Cell , PVC.
58. What is
sliding window protocol ? Differentiate between stop-and wait ARQ and
Go-back-N protocol.
59. Differentiate
between ISO-OSI and TCP/IP reference model.
60. Explain leaky
bucket algorithm and compare it with token bucket algorithm.
61. Explain ATM
reference model.
62. Explain
different kinds of Switching techniques.
63. Differentiate
between Link state and Distance Vector Routing algorithm.
64. Explain
network layer in ATM,
65. Differentiate
between IEEE 802.3, IEEE 802.4 and IEEE 802.5 standards.
66. Explain any
three error detection and correction techniques.
67. Explain
various cabling techniques used in IEEE 802.3 standard,