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10:Firewall (Defination (Prevent specific types of information from moving…

- - - - Combine elements of other types of firewalls
        
        may consist of two separate firewall devices; each a separate firewall system, but connected to work in tandem
        
        e.g
        
        packet filtering and circuit gateways
        
        packet filtering and proxy services
    - - E.g
        
        IP
        
        Direction
        
        Inbound
        
        Outbound
        
        TCP & UDP
      - firewalls examine header information of data packets
      - Subset
        
        Static filtering
        
        the firewall decides which packets are allowed and which are denied are developed and installed.
        
        Dynamic filtering
        
        react to an emergent event and update or create rules to deal with the event.
        
        Stateful Inspection
        
        firewalls that keep track of each network connection between internal and external systems using a state table
    - - media access control layer
      - consider specific host computer’s identity in its filtering decisions
      - MAC addresses of specific host computers
        
        linked to access control list (ACL) entries
        
        identify specific types of packets
        
        all other traffic is blocked
        
        sent to each host;
    - - transport layer
      - prevent direct connections between one network and another
      - creating tunnels
        
        connecting specific processes or systems on each side of the firewall
        
        allow only authorized traffic in the tunnels