A user's remote marketing server has changed IP address schemes and now the user can no longer access it. The user further discovers that the distant end still has access to them. Which of the following is a possible cause?

a) SNMP strings need to be added
b) Firewall rules need to be configured
c) Port bonding on the interface needs to be enabled
d) The switch has lost power

Answer: b) Firewall rules need to be configured