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[Fall, 2015] ASSIGNMENT
PROGRAM - BSC IT
SEMESTER - 2
SUBJECT CODE & NAME - BT0072 COMPUTER
NETWORKS
CREDIT 4
BK
ID B0956 MAX. MARKS 60
Q.
No. 1 What is OSI model? Explain all its layers with diagram. [3+7] 10
Answer: It shows how to facilitate communication between different
systems without requiring changes to the logic of underlying hardware and
software.
The OSI model is not a
protocol; it is a model for understanding and designing a network architecture
that is flexible, robust
Qus:2
Briefly explain Integrated Services Digital Network and its services.
Answer:
Integrated
Services Digital Network and its services:
ISDN is
developed by ITU-T in 1976. It is a set of protocols that combines digital
telephony and data transport services. The whole idea is to digitize the
telephone network to permit the transmission of
3
What is the function of data link layer? Explain the services of the data link
layer. [4+6] 10
Answer: Data Link
Layer Functions:
It provides a
well defined service interface to the network layer, determining how the bits
of the physical layer are grouped into frames, dealing with transmission
errors, regulating the flow of frames so that slow receivers are not swamped by
fast senders, and general link management.
The main
4
Explain Shortest Path routing Algorithm. [10]
Answer: Shortest Path
Algorithm
This technique is
widely used because of its simplicity and easy to understand. It is a static
algorithm
5
Discuss any two design issues of Session Layer. 10
Answer: The design issues of the session layer include:
Dialog
Management
In principle,
all OSI connections are full duplex, i.e., PDUs can move in both directions
over the same connection simultaneously. However, there are many situations in
which the upper layer software is
Q6.
What is the role of Multipurpose Internet Mail Extensions? Briefly explain its
five parts.
Answer:
Short for Multipurpose
Internet Mail Extensions, a specification for formatting non-ASCII messages so
that they can be sent over the Internet. Many e-mail clients now support MIME,
which enables
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