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Discuss the reasons why using LAN switches improves the security of a network? Discuss the move of Ethernet from a LAN technology to also becoming

Discuss the reasons why using LAN switches improves the security of a network?
Discuss the move of Ethernet from a LAN technology to also becoming a metropolitan and wide-area technology. What has made this possible?
Initially used only for data communications network, Ethernet is now also being applied in real time industrial control networking. Discuss the physical and operational challenges that Ethernet has to overcome to be fully applied in this area?

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