The ACL 55 on R1 has four statements, in the following order, with address and wildcard mask values as follows:

1. 20.0.0.0 0.255.255.255
2. 20.20.0.0 0.0.255.255
3. 20.20.20.0 0.0.0.255
4. 2.2.2.0 0.0.0.255

If a router tried to match a packet sourced from IP address 20.20.20.20 using this ACL, which ACL statement does a router consider the packet to have matched?

(A) First statement
(B) Second statement
(C) Third statement
(D) Forth statement
(E) Implied deny at the end of the ACL

First statement is the correct answer.

The router always searches the ACL statements in order (from top to bottom) and stops trying to match ACL statements after a statement is matched. In other words, it uses first-match logic. There is no subnet provided, thus we must assume the adddress is using a default subnet mask of 255.0.0.0.