This multiple choice quiz contains questions about computer networks and the internet. It covers topics like transmission delay, end-to-end delay, bandwidth, and throughput for different network configurations. The document tests understanding of these concepts by posing scenarios involving file transfers between hosts with varying distances, link speeds, and network architectures.

1.  Home Self-Assessment Multiple Choice Quiz Chapter 1
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Self-Assessment Multiple Choice Quiz
Chapter 1: Computer Networks and the Internet
In the following 7 problems, we are sending a 30 Mbit MP3 le 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 le is sent as one packet. The transmission delay is:
Referring to the above question, the end-to-end delay (transmission delay plus
propagation delay) is
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50 milliseconds50 milliseconds
3.05 seconds3.05 seconds
3 seconds3 seconds
none of the above.none of the above.
3 seconds3 seconds
3.05 seconds3.05 seconds
6 seconds6 seconds

2. 3
4
5
Referring to the above question, how many bits will the source have transmitted
when the rst bit arrives at the destination.
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 le 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
Now suppose that the MP3 le is broken into 3 packets, each of 10 Mbits. Ignore
headers that may be added to these packets. Also ignore router processing delays.
Assuming store and forward packet switching at the router, the total delay is
none of the abovenone of the above
1 bit1 bit
30,000,000 bits30,000,000 bits
500,000 bits500,000 bits
none of the abovenone of the above
3.05 seconds3.05 seconds
6.05 seconds6.05 seconds
6.1 seconds6.1 seconds
none of the abovenone of the above
3.05 seconds3.05 seconds

3. 6
7
8
Now suppose there is only one link between source and destination, and there are
10 TDM channels in the link. The MP3 le is sent over one of the channels. The end-
to-end delay is
Now suppose there is only one link between source and destination, and there are
10 FDM channels in the link. The MP3 le is sent over one of the channels. The end-
to-end delay is
Review the car-caravan example in Section 1.6. Again assume a propagation speed of
100 km/hour. Suppose the caravan travels 200 km, beginning in front of one
4.05 seconds4.05 seconds
6.05 seconds6.05 seconds
none of the abovenone of the above
300 microseconds300 microseconds
30 seconds30 seconds
30.05 seconds30.05 seconds
none of the abovenone of the above
300 microseconds300 microseconds
3 seconds3 seconds
30.05 seconds30.05 seconds
none of the abovenone of the above

4. 9
10
tollbooth, passing through a second tollbooth, and nishing just before a third
tollbooth. What is the end-to-end delay?
Referring to the above problem, suppose now that when a car arrives at the second
tollbooth, it proceeds through the tollbooth without waiting for the cars behind it.
What is the end-to-end delay?
Suppose there are two links between a source and a destination. The rst link has
transmission rate 100 Mbps and the second link has transmission rate 10 Mbps.
Assuming that the only tra c in the network comes from the source, what is the
throughput for a large le transfer?
62 minutes62 minutes
64 minutes64 minutes
122 minutes122 minutes
124 minutes124 minutes
62 minutes62 minutes
122 minutes and 12 seconds122 minutes and 12 seconds
122 minutes and 24 seconds122 minutes and 24 seconds
124 minutes124 minutes
1 Gbps1 Gbps
110 Mbps110 Mbps
10 Mbps10 Mbps
100 Mbps100 Mbps

5. 11
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