1 (a) For the bit stream 100010100 sketch the waveform
for Manchester and Differential Manchester Coding and
also discuss the advantages of the coding schemes. [5]
(b) The waveform of the following figure belongs to
a Manchester coded binary data stream. Determine the
beginning and end of bit periods (i.e. extract clock
information) and give the data sequence. [6]
(c) Why should PCM be preferable to DM for encoding
analog signals that represent digital data? [4]
(d) Exactly how many classes A, B, C network can exist
in IP address? Exactly how many hosts can a network
in each class have? [5]
(e) In a network that has a maximum TPDU (Transport
protocol data unit) size of 128 bytes, a maximum TPDU
lifetime of 30 sec and an 8 bit sequence number, what
is the maximum data rate per connection? [10]
2 (i) Explain through diagrams the functioning of HDLC
protocol for the following:
· Link setup and disconnect
· Two way data exchange
· Busy condition
· Error recovery using REJ command [10]
(ii) What are two types of non-data cells in ATM? How
are they distinguished from data cells by the receiver?
[5]
3 (i) Compare the priority schemes for IEEE 802.5 token
ring and FDDI. What are the relative pros and cons?
[9]
(ii) What happens in a token bus if a station accepts
the token and then crashes immediately? How does the
protocol handle this situation? [6]
4 (i) Compare the individual fields of the IPv4 header
with IPv6 header. Account for the functionality provided
by each IPv4 field by showing how the same functionality
is provided in IPv6. [10]
(ii) How does a gateway do with the “time to
live” value in an IP header? [5]
5 (i) Sketch TCP finite state machine and explain its
operation in brief. [9]
(ii) Lost TCP acknowledgements do not necessarily force
retransmission. Explain why? [6]
6 Discuss in detail the following in the context of
the high speed modems:
(i) Quadratum Amplitude Modulation [4]
(ii) Trellis coding [4]
(iii) V.32 and V.34 bits [4]
(iv) MNP5 [3]
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