Question: a. In computer networking, the Network Layer can ensure correct delivery of data from source to destination (end-to-end communication). Why is Transport Layer still

a. In computer networking, the Network Layer can ensure correct delivery of data from source to destination (end-to-end communication). Why is Transport Layer still needed? Describe 3 reasons of having the Transport Layer. b. Discuss why the Transmission Control Protocol (TCP) uses a "four-way handshake" to close a connection. Is it completely foolproof? Why or why not? c. When a user clicks on a hyperlink, the web server carries out a series of actions. Describe in detailed steps the operations of a Web server before and after it receives a file request from a remote host. d. In blockchain applications such as the bitcoin, explain how immutability is achieved i.e., the data cannot be altered by any of the users in the network.

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