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For this section we want to spend time reviewing firewall best practices. We begin with the pros and cons of having firewalls in your network by looking at issues firewall deployment causing. We discuss potential bottlenecks, mis-configuring the firewall and the lack of protection against internal attacks other adverse issues, then discuss some generic supports such as blocking directed IP address, drops or reassembles fragment and performs traffic ingress/egress filtering which is a key benefit.