Question: 20. Computer Network a) Why do we need a network? b) Network security is important, but what are the threats? c) What is the difference

20. Computer Network a) Why do we need a network? b)

20. Computer Network a) Why do we need a network? b) Network security is important, but what are the threats? c) What is the difference between a peer-to-peer network and a client-server one? d) What are the benefits of the OSI 7-layered model? e) What is the difference between a passive hub and an active hub? f) What is the oldest application layer protocol, what does it do and what are its drawbacks

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