In networking term LAN congestion is too much data forced through a route that results in the inability to process the data fast enough which inevitably leads to delays and packet loss. This is common and very serious issue for the network and here’s list of major
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§ Purpose of Firewall The firewall should prevent unwanted traffic, block “downtime” on the local network and protect the computers in it. As long as the applications used strictly defined ports and protocols, it was also possible using conventional firewall devices that block traffic on
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