CSCE 416 UofSC Test 1 and Final exam
review (includes Test 2 Mutiple choice)
2026 Questions and Answers Graded A+
Suppose Host A wants to send a 30 MB file to Host B. The path from Host A to
Host B has 3 links, of rates 15, 20, and 10 Mbps respectively. Roughly how long
will it take to transfer the file to Host B? - Correct answer-24 seconds [(30*8)/10]
Suppose two hosts, A and B are separated by 10^5 meters and are connected by a
direct link with a bandwidth of 1Mbps. Suppose the propagation speed over the
link is 2.5x10^8 meters/s. suppose a file of 80,000 bits from Host A to Host B is
sent continuously as one large message. What is the maximum number of bits that
will be in the link at any given time? - Correct answer-400bits
((10^5)/(2.5 x 10^8)) * 1,000,000
Consider sending a packet from a source host to a destination host over a fixed
route. List the delay components in the end to end delay. Which of theses delays
are constant and which are variable. Justify your answer. - Correct answer-Nodal
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, processing delay, queuing delay, transmission delay, propagation delay. All are
constant except queuing, which depends on network congestion.
Calculate the access link utilization for the following network with a web cache:
LAN rate 1Gbps; Access link rate 100Mbps; Average request rate per user 5Mbps;
#users 10; Cache hit rate 40% - Correct answer-30Mbps
What are the five layers in the internet protocol stack and their responsibilities? -
Correct answer-Application-support networking applications
Transport- process to process data transfer
Network- routing datagrams from source to destination
Link- data transfer between neighboring network elements
Physical- "bits" on the wire
Describe why an appliaction developer might choose to use UDP over TCP. Give
an example. - Correct answer-UDP is lower-latency, making it fast and responsive,
simpler, no congestion control, more customization.
Online games would use UDP to ensure low latency.
How many round trips would it take to download a webpage that contains 12
embedded objects from a server? assume that the page and each of the embedded
©COPYRIGHT 2026, ALL RIGHTS RESERVED 2
review (includes Test 2 Mutiple choice)
2026 Questions and Answers Graded A+
Suppose Host A wants to send a 30 MB file to Host B. The path from Host A to
Host B has 3 links, of rates 15, 20, and 10 Mbps respectively. Roughly how long
will it take to transfer the file to Host B? - Correct answer-24 seconds [(30*8)/10]
Suppose two hosts, A and B are separated by 10^5 meters and are connected by a
direct link with a bandwidth of 1Mbps. Suppose the propagation speed over the
link is 2.5x10^8 meters/s. suppose a file of 80,000 bits from Host A to Host B is
sent continuously as one large message. What is the maximum number of bits that
will be in the link at any given time? - Correct answer-400bits
((10^5)/(2.5 x 10^8)) * 1,000,000
Consider sending a packet from a source host to a destination host over a fixed
route. List the delay components in the end to end delay. Which of theses delays
are constant and which are variable. Justify your answer. - Correct answer-Nodal
©COPYRIGHT 2026, ALL RIGHTS RESERVED 1
, processing delay, queuing delay, transmission delay, propagation delay. All are
constant except queuing, which depends on network congestion.
Calculate the access link utilization for the following network with a web cache:
LAN rate 1Gbps; Access link rate 100Mbps; Average request rate per user 5Mbps;
#users 10; Cache hit rate 40% - Correct answer-30Mbps
What are the five layers in the internet protocol stack and their responsibilities? -
Correct answer-Application-support networking applications
Transport- process to process data transfer
Network- routing datagrams from source to destination
Link- data transfer between neighboring network elements
Physical- "bits" on the wire
Describe why an appliaction developer might choose to use UDP over TCP. Give
an example. - Correct answer-UDP is lower-latency, making it fast and responsive,
simpler, no congestion control, more customization.
Online games would use UDP to ensure low latency.
How many round trips would it take to download a webpage that contains 12
embedded objects from a server? assume that the page and each of the embedded
©COPYRIGHT 2026, ALL RIGHTS RESERVED 2
