1)What are the commands and parameters does not affect IPV4 routing decision of network?

2)An access control list is preventing UDP traffic to go through a router interface in both ways. What is the command to test if the router can route in both directions between a pair hosts in different subnetwork?

3) You have issued this command " ip access-list 23 permit 120.56.5.0.0.0.1.255. After that you have issued this command "access-class 23 in". What is the direct effect of the sequence of the commands?