An engineer must configure a ACL that permits packets which include an ACK in the TCP header. Which entry must be included in the ACL?

A. access-list 110 permit tcp any any eq 21 tcp-ack
B. access-list 10 permit ip any any eq 21 tcp-ack
C. access-list 10 permit tcp any any eq 21 established
D. access-list 110 permit tcp any any eq 21 established

An engineer must configure a ACL that permits packets which include an ACK in the TCP header. Which entry must be included in the ACL?

A. access-list 110 permit tcp any any eq 21 tcp-ack
B. access-list 10 permit ip any any eq 21 tcp-ack
C. access-list 10 permit tcp any any eq 21 established
D. access-list 110 permit tcp any any eq 21 established

Correct Answer: D

It is a extendend access-list.

Standard 1–99 and 1300–1999

Extended IP 100–199 and 2000–2699