A user calls and says that she is able to work on all applications except Internet explorer web browsing. When she tries to access a website, she receives this error: "Page cannot be displayedcannot find server or DNS error."

What can be the cause of the problem and on which layers can the problem exist? Provide possible solutions to each cause of the problem

List the various troubleshooting steps that Alex should conduct to resolve the issue, assuming he approaches the most common error first and the least common error last.

Another user who manages a tremendous amount of data on a daily basis has encountered a network problem. He has an idea that the problem is related to usage of TCP and UDP.

How is data transmitted through the different layers of the TCP and UDP? Describe the specific layers in which data is transmitted using TCP and UDP.

Do you agree with this statement that "TCP is always more reliable than UDP?" Why or why not? List and compare the security considerations of both the data transfer techniques.

Can TCP and UDP be used interchangeably? Which factors will influence their interchangeable use? Describe the difference of TCP and UDP. Also, list and compare the factors of transmission with respect to the data transmission technique used by them.