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What are five tuples a stateful inspection firewall will check for incoming connection?
Source port, destination port, destination address, flags, checksum
Source port, Destination port, Sequence number, source address, destination address
source address, destination address, destination port, flags, MTU
Stateful Inspection firewall will check source and destination address, source and destination port and sequence number against incoming connection against its state table. This firewall operates at layer 4. It also does randomization of sequence number to prevent sequence predication based attacks.
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