Answer:
a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules
answer:
Mainframe computers are used by large companies and organisations to perform critical tasks that involve bulk data processing like transaction processing, census information, statistical data and so on. They consist of extensive input and output facilities, are very stable and dependable and handle millions of transactions every day
Explanation:
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All arthropods have exoskeletons, like insects, spiders and crustaceans.