Given the ACL 'ip access-list extended STATEFUL

The established keyword in an extended ACL for TCP traffic permits packets that have either the ACK or RST bits set. This indicates the packet belongs to an already established connection or is attempting to reset one. Therefore, TCP traffic with the ACK bit set is allowed by line 10. The SYN bit is used to initiate a connection, so packets with only the SYN bit set would be denied by line 20. The URG (Urgent) and DF (Don't Fragment) bits are flags that provide additional information about the packet but do not define connection establishment in the way ACK or RST do.