Consider the access list command applied outbound on a router serial interface. Consider the access list command applied outbound on a router serial interface. Block all traffic from sales vlan (192.168.10.0/24) to it vlan (192.168.20.0/24) explicitly allow icmp echo replies (ping responses) from sales to it maintain all other network functionality
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Devices on the 192.168.10.0/24 network are not allowed to reply to any ping requests.
Only layer 3 connections are allowed to be made from the router to any other.
A telnet or ssh session is allowed from any device on the 192.168.10.0 into the router with this access list assigned. The key to it is that access lists are processed one step at a time, in order, and that the first statement that is a true condition will cause the router to execute that permit or deny. Devices on the 192.168.10.0/24 network are allowed to.