APSU CSCI 2700 Chapter 1 Quiz 1 With Complete Solutions
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 * 10^8
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:
a. 3 seconds
b. 50 milliseconds
c. none of the above
d. 3.05 seconds - ANSWER a. 3 seconds
Referring to the above question, the end-to-end delay (transmission delay plus
propagation delay) is:
a. 3 seconds
b. 6 seconds
c. 3.05 seconds
d. none of the above - ANSWER c. 3.05
Referring to the above question, how many bits will the source have transmitted when
the first bit arrives at the destination:
a. none of the above
b. 30,000,000 bits
, c. 500,000 bits
d. 1 bit - ANSWER c. 500,000 bits
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:
a. 6.1 seconds
b. 6.05 seconds
c. 3.05 seconds
d. none of the above - ANSWER b. 6.05 sceonds
Now suppose that the MP3 file 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:
a. 4.05 seconds
b. none of the above
c. 6.05 seconds
d. 3.05 seconds - ANSWER a. 4.05 seconds
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:
a. 30 seconds
b. 300 microseconds
c. 30.05 seconds
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 * 10^8
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:
a. 3 seconds
b. 50 milliseconds
c. none of the above
d. 3.05 seconds - ANSWER a. 3 seconds
Referring to the above question, the end-to-end delay (transmission delay plus
propagation delay) is:
a. 3 seconds
b. 6 seconds
c. 3.05 seconds
d. none of the above - ANSWER c. 3.05
Referring to the above question, how many bits will the source have transmitted when
the first bit arrives at the destination:
a. none of the above
b. 30,000,000 bits
, c. 500,000 bits
d. 1 bit - ANSWER c. 500,000 bits
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:
a. 6.1 seconds
b. 6.05 seconds
c. 3.05 seconds
d. none of the above - ANSWER b. 6.05 sceonds
Now suppose that the MP3 file 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:
a. 4.05 seconds
b. none of the above
c. 6.05 seconds
d. 3.05 seconds - ANSWER a. 4.05 seconds
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:
a. 30 seconds
b. 300 microseconds
c. 30.05 seconds
