Question: answer the following; 1- why use a layered communication model in networking? 2-Explain the different attributes in TCP/IP header? 3-justify the need of network security?

answer the following;
1- why use a layered communication model in networking?
2-Explain the different attributes in TCP/IP header?
3-justify the need of network security?
4-explain how peer-to-peer communication works using the OSI model?

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