[SPRING,
2015] ASSIGNMENT
PROGRAM - BSC IT
SEMESTER - 2
SUBJECT CODE & NAME - BT0072 COMPUTER
NETWORKS
CREDIT 4
BK
ID B0956 MAX. MARKS 60
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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
Q2
Write a short note on ALOHA protocols. [10]
Answer:
ALOHA Protocols
In 1970s, Norman
Abramson and his colleagues at University of Hawaii devised a new and elegant
method to solve the channel allocation problem. Their work has been extended by
many researchers since then. His work is called the ALOHA system which uses ground-based
radio
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. Consider a subnet given in figure 6.4 (a). Several algorithms for
computing shortest path between the
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
Q6.
Describe the structure of the DNS namespace on the Internet.
Answer:
Domains
define different levels of authority in a hierarchical structure. The top of
the hierarchy is called the root domain. The DNS namespace on the Internet, as
shown
·
Root domain
·
Top-level domains
·
level domains
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