What is the result of applying this access control list?
ip access-list extended STATEFUL
10 permit tcp any any established
20 deny ip any any
A . TCP traffic with the URG bit set is allowed
B . TCP traffic with the SYN bit set is allowed
C . TCP traffic with the ACK bit set is allowed
D . TCP traffic with the DF bit set is allowed
Answer: C
Explanation:
The established keyword is only applicable to TCP access list entries to match TCP segments that have the ACK and/or RST control bit set (regardless of the source and destination ports), which assumes that a TCP connection has already been established in one direction only.
Let’s see an example below:
Suppose you only want to allow the hosts inside your company to telnet to an outside server but not vice versa, you can simply use an “established” access-list like this: access-list 100 permit tcp any any established access-list 101 permit tcp any any eq telnet ! interface S0/0 ip access-group 100 in ip access-group 101 out
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