APJ ABDUL KALAM TECHNOLOGICAL
UNIVERSITY
SECOND SEMESTER M.TECH DEGREE EXAMINATION, MAY 2016

Computer Science and Engineering /Interdisciplinary
(Computer Science" ranslational Engineering)
010560106 Advanced Computer Networks
Max. Marks : 60 Duration: 3 Hours

Answer any two questions from each part

Part A
I (a) Explain the TCP/IP refernce model.

(b) Define bandwidth-delay product in the context of network performance. What is the
importance of the bandwidth-delay product for networks? Does the bandwidth-delay
product equally affect all protocols? Give an example of a system that has a large
bandwidth-delay product. (4)

2. (a) Explain concepts of subnetting and supemetting with examples (3)

(b) In packet switching networks, the source host segments long application layer messages
(for example an image or a music file) into smaller packets and sends the packets into the
network. The receiver re-assembles the packets back into the original message. Figure 1
illustrates the end-to- end transport of a message with and without segmentation. Consider
a 7.5 * 106 bits long message that is to be sent from the source to the destination as shown
in the figure. Suppose that each link in the figure is 1.5 Mbps. Ignore propagation, queuing
and processing delays. You can assume that you do not have to wait for ACKs when
sending the message with segmentation.

a. Source Packet switchPacket switchDestination

Packet