Using a packet analyzer tool $($e$.$g$.,$ Wireshark, packet tracer$),$ capture a set of packets from a network activity $($such as visiting a website$).$ Analyze the captured packets to:

a$)$ Identify the protocols used at each OSI layer.

b$)$Explain the role of each identified protocol in the data communication process.

c$)$ Highlight any findings that indicate how Layer $3($Network Layer$)$ routing decisions are made.

d$)$ Discuss how Layer $4($Transport Layer$)$ protocols ensure data integrity and order.

You are provided with a network topology and a list of symptoms indicating network issues, such as slow internet connectivity, inability to access certain network resources, and intermittent connectivity problems. Your tasks are:

a$)$ Diagnose the issues based on the symptoms and the provided network topology.

b$)$Identify potential causes for each symptom.

c$)$ Propose solutions to resolve the identified issues.

d$)$ Implement the solutions on a network simulator and test the network to ensure that the issues are resolved.