You are the network administrator at ComputerNetworkingNotes.com.
Your company hire a new employee and give him a pc 10.0.0.3. your company's critical record remain in 40.0.0.3. so you are asked to block the access of 40.0.0.3 from 10.0.0.3. while 10.0.0.3 must be able connect with other computers of network to perfom his task.
Decide where to apply ACL and in which directions.
As we are configuring Extended access list.
With extended access list we can filter the packed as soon as it genrate.
So we will place our access list on F0/0 of Router1841 the nearest port of 10.0.0.3