[Summer, 2014] ASSIGNMENT
PROGRAM - Master of Science in
Information Technology (MSc IT)
SEMESTER - 2
SUBJECT CODE & NAME - MIT204–
Data Communication & Networking
CREDIT
– 4 BK ID - B1389 MAX. MARKS - 60
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1 Write
about transmission impairments.
Answer:
Analog
signal consist of varying a voltage with time to represent an information
steam. If the transmission media were perfectly, the receiver could receive
exactly the same signal that the transmitter sent. But communication lines are
usually not perfect, so the receive signal is not the same as the transmitted
signal. For digital data this difference can lead to errors. Transmission lines
suffers from three major
2.
a) Give
the classification of computer network.
b)
Mention the advantages of a linear bus topology.
Answer:
a.
A computer
network is a system for communication among two or more computers. Computer
networks can be categorized by
range, functional relationship, network topology and specialized function.
By range
- personal area network (PAN)
- wireless PAN
3 Explain
a) Character stuffing b) bit stuffing [5+5] 10
Answer:
a)
Character
stuffing
This
method gets around the problem of synchronization after an error by having each
frame start and end with special bytes. This method operates on bytes. The
special bytes are reserved characters to indicate the start and end of a frame.
A serious problem occurs when binary data like floating point numbers or object
programs are transmitted. In such cases For instance, use the two-character
sequence
4 What
is congestion? Explain
Answer:
Definition: Congestion
is a major problem when traffic in the network is very high.
When too
many packets are present in (a part of) the subnet, performance degrades. This
situation is called congestion.
Figure
10.1 depicts the symptom. When the number of packets dumped into the subnet by
the hosts is within its carrying capacity, they are all delivered (except for a
few that are afflicted with transmission
5 Explain
the following
a)
Class A networks
b)
Class B networks [5+5] 10
Answer:
Class A
networks
Each
Class A network address has an 8-bit network-prefix with the highest order bit
set to 0 and a seven-bit network number, followed by a 24-bit host-number.
Today, it is no longer considered 'modern' to refer to a Class A network. Class
A networks are now referred to as "/8s" (pronounced "slash
eight" or just "eights") since they have an 8-bit
network-prefix.
6.Explain
the following.
a) Open
loop congestion control
b)
Closed loop congestion control
Answer: Open
Loop Congestion Control
• In this
method, policies are used to prevent the congestion before it happens.
• Congestion
control is handled either by the source or by the destination.
Get fully solved assignment, plz drop a mail with your sub code
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Charges rs
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7. List
the various categories of network security problems. Explain any two.
Answer: Network
security problems can be divided roughly into four categories:
1) Secrecy:
2)
Authentication
3) Non-repudiation
4) Integrity control
1) Secrecy: It is also called confidentially. It has
to do with keeping information out of hands of unauthorised users.
2) Authentication: It deals with determining who the
destination or recipient is before revealing
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