Why application that are installed on PC's in R2 LAN network 10.100.20.0/24 are unable to communicate with Server1?
正解:B
Explanation/Reference: Explanation: We should check if we can ping from R1 to Server 1 or not: The ping worked well so maybe R1 is good so we should check R2 first. We notice on R2 there is an access-list: This access-list is applied to E0/2 interface with inbound direction. The purpose of this access-list is to block traffic with source IP address of 172.16.200.0/24 so it will block all traffic sent from Server 1 to us.