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Many clients using a service, Generally the flash crowd disappears when the, Lots of vulnerabilities on hosts in network, Lots of exploits in wild (no patch for them), Put firewalls across the perimeter of the network, Packet filter selectively passes packets from one, Usually done within a router between external and, Can be done by a dedicated network element, harder to detect and attack than screening routers, Drop the packet (Notify Sender/Drop Silently), Block all packets from outside except for SMTP, Block all connections from a specified domain, Internal hosts can access DMZ and Internet, External hosts can access DMZ only, not Intranet, If a service gets compromised in DMZ it cannot, If a condition satisfied action is taken, Allow SSH from external hosts to internal hosts, Outbound traffic from external address ? Take it here. Authorized users gain access to network resources, but malicious actors are blocked from carrying out exploits and threats. 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