Question: it is question from network administration server 2008 course kindly answer full question in detail. a) Explain the idea of firewall? How high level, medium

it is question from network administration server 2008 course kindly answer full question in detail.
a) Explain the idea of firewall? How high level, medium level and low level firewall is implemented by system administrator. b) What are advance measures in case of failure of network or server and also in serious virus attack
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