Switch2 is not allowing VLAN 70 which is used on Switch1 for RSPAN So we must allow it -> Option B is correct (although it would not allow VLAN 81 to 90 to go through). "An external packet capture device is connected to switch2 interface GigabitEthernet1/2" so we must configure Gi1/2 as the destination port. For your information, this is how to configure Remote SPAN (RSPAN) feature on two switches. Traffic on FastEthernet0/1 of Switch 1 will be sent to Fa0/10 of Switch2 via VLAN 40. + Configure on both switches Switch1,2(config)#vlan 40 Switch1,2(config-vlan)#remote-span + Configure on Switch1 Switch1(config)# monitor session 1 source interface FastEthernet 0/1 Switch1(config)# monitor session 1 destination remote vlan 40 + Configure on Switch2 Switch2(config)#monitor session 5 source remote vlan 40 Switch2(config)# monitor session 5 destination interface FastEthernet 0/10