UNIT-I 1. (a) List two advantages and two disadvantages of having ...

meetcokeΔίκτυα και Επικοινωνίες

26 Οκτ 2013 (πριν από 3 χρόνια και 7 μήνες)

129 εμφανίσεις


Computer networks

PRAGNAKRISHNA, Asst.Prof,KECW

Page
1


UNIT
-
I


1. (a) List two advantages and two disadvantages of having international standards

for network, Protocols?

(b) Write short notes on interfaces and services of ISO layers.

2. (a) Briefly explain about the TCP/IP reference model.

(b) Compare and
contrast OSI and TCP/IP models.

3. (a) Explain in detail ISO
-
OSI reference model.

(b) With a neat diagram, explain the functionality of layers, protocols and inter
-
faces.

4. (a) Write any four reasons for using layered protocols.

(b) List two ways in whic
h the OSI reference model and the TCP/IP reference

model are the same and list in which they differ.

(c) Which is the principle difference between CO communication and CL communication.

5. (a) Two networks each provide a reliable connection oriented servi
ce. One of them

offers a reliable byte stream and other offers a reliable message stream. Are

they identical? If so, why is distinction made? If not give an example of how

they differ?

(b) List two advantages and two disadvantages of having international s
tandards

for network, Protocols?

6. (a) List two advantages and two disadvantages of having international standards

for network, Protocols?

(b) With a neat diagram, explain the functionality of layers, protocols and inter
-

faces.


7.a) Explain the design
of original ARPANET.

b) What are the three criteria necessary for an effective and efficient network?

c) Name the four basic network topologies and give an advantage for each type.


8.a) Explain the frame format of Novell Netware IPx packet.

b) What is an internet? What is Intranet?

c) For n devices in a network, what is the number of cable links required for a mesh, ring, bus
and star topology?


9.a) What are the factors that determine whether a communication system is a LAN, MAN or
WAN?

b
) Explain the layer of the Internet model.


10.a) Explain the reference model of Novell Network.

b) Explain about the critique of the OSI Model and its protocols

11. (a) How does Internet differs from WAN?

(b) Give an example where we require

i. Simplex c
ommunication


ii. Half duplex communication

iii. Full duplex communication.

(c) What are the two reasons for using layered protocols



Computer networks

PRAGNAKRISHNA, Asst.Prof,KECW

Page
2


12. (a) Compare point
-
to
-
point channels with broadcast channels along with suitable

examples?

(b) A collecti
on of five routers is to be collected in a point
-
to
-
point subnet. Be
-

tween each pair of routers, the designers may put a high speed line, a medium
-

speed line, a low
-
speed line, or no line. If it takes 100ms of computer time

to generate and inspect each t
opology, how long will it take to inspect all of

them to find the one that best matches the expected load?

13. (a) Define the following terms:

i. Computer Network

ii. Peer process

iii. Protocol

iv. Interface.

(b) Discuss various network applications and
goals in detail.

14. Differentiate between the following:

(a) WAN and Internet

(b) Connection oriented service and Connection less service

(c) OSI Vs TCP/IP.

15. (a) What is the relationship between telecommunications and data communica
-

tions? Is one a su
bset of other? Give reasons for your answers?

(b) What are the different goals and applications of networking? Give five reasons

of how networks are a part of our lives?


16. (a) What are the distinct characteristics of local area networks, explain briefly
?

Why is a LAN required and what objectives are achieved by having a LAN

(b) A group of 2
n

1 routers are interconnected in a centralized binary tree, with

a router at each tree node. Router
i
communicate with router
j
by sending a

message to the root of th
e tree. The root then sends the message back down

to
j
. Derive an approximate expression for the mean number of hops per

message for large n, assuming that all router pairs are equally likely.


17. Write short notes on the following:

(a) Client server mode
l

(b) MAN

(c) Interfaces and services.