# CS 3510 NETWORKING HOMEWORK 1

## CS 3510 NETWORKING HOMEWORK 1

﻿CS 3510 NETWORKING HOMEWORK 1

In the following 7 problems, we are sending a 30 Mbit MP3 file from a source host to a
destination host. All links in the path between source and destination have a transmission rate
of 10 Mbps. Assume that the propagation speed is 2 * 108 meters/sec, and the distance
between source and destination is 10,000 km.
Initially suppose there is only one link between source and
destination. Also suppose that the entire MP3 file is sent as
one packet. The transmission delay is:
3 seconds
3.05 seconds
50 milliseconds
none of the above.
Referring to the above question, the end-to-end delay
(transmission delay plus propagation delay) is
6 seconds
3.05 seconds
3 seconds
none of the above
Referring to the above question, how many bits will the
source have transmitted when the first bit arrives at the
destination.
1 bit
30,000,000 bits
500,000 bits
none of the above
Now suppose there are two links between source and
destination, with one router connecting the two links. Each
link is 5,000 km long. Again suppose the MP3 file is sent as
one packet. Suppose there is no congestion, so that the
packet is transmitted onto the second link as soon as the
router receives the entire packet. The end-to-end delay is
3.05 seconds
6.1 seconds
6.05 seconds
none of the above
Now suppose that the MP3 file is broken into 3 packets,
these packets. Also ignore router processing delays.
Assuming store and forward packet switching at the router,
the total delay is
6.05 seconds
4.05 seconds
3.05 seconds
none of the above
Now suppose there is only one link between source and
destination, and there are 10 TDM channels in the link. The
MP3 file is sent over one of the channels. The end-to-end
delay is
30.05 seconds
30 seconds
300 microseconds
none of the above
Now suppose there is only one link between source and
destination, and there are 10 FDM channels in the...