COP4521 Homework 4

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1) (10 points) Explain network protocol and service interface.





2) (20 points) List four types of network services. Give all possible
types of services that can result in the following scenario: the
sender sends 1, 2, 3, 4, 5 and the receiver receives 1, 2, 3. 





3) (20 points) List the seven layers in the ISO/OSI reference model, and
briefly describe the main functionality in each layer.






4) (20 points) List the four layers in the TCP/IP reference model, and
briefly describe the main functionality in each layer.







5) (20 points) Describe the control flow of major socket function calls
in a sequential server program and in a network client program.






6) (10 points) Ashley was excited to get the 1Gbps Internet service.
She performed an Internet speed test for the downlink on her PS5,
which indicated that for the speed test, 500MB data was sent. When the
test was done, it was reported that the downlink speed was 200Mbps.
How much time did it take to perform the speed test?