a) Packet filter
Screens packets based on IP address and packet option. Operate on th3e IP packet level and make security decision whether to forward or not forward packet based on the header of the packets
b) Circuit gateways
Operate at network transport layer connection are authorized based on addresses
c) Application gateways
Operate at the application level and can examine application date level.
lydiajane74 answered the question on May 4, 2018 at 18:33
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