The established keyword indicates that packets belong to an existing connection if the Transmission Control Protocol (TCP) datagram has the Acknowledgment (ACK) or Reset (RST) bit set.
https://community.cisco.com/t5/networking-documents/how-to-configure-acls-to-permit-only-established-connections-and/ta-p/3127503
of course C is right because
two nodes is connected and established together when ACK message is send from source to destination
first message : SYN from source to destination
second message : SYN,ACK from destination to source
thied message : ACK from source to destination
The given solution is correct
The return traffic having an ACK will start a new session in the firewall.
upvoted 3 times
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