If the broadcast flag in the DHCP Discovery message sent by the DHCP client to the DHCP relay is 0, the DHCP relay responds to the DHCP offer message of the DHCP client with ______.

The following ACL is configured on the MSR router:
acl number 3999
rule permit tcp source 10.10.10.1 255.255.255.255 destination 20.20.20.1 0.0.0.0 time-range lucky
Then the correct understanding of the ACL is _______. (Multiple choice)

The two routers MSR-1 and MSR-2 are interconnected through GigabitEthernet0/0, and RIPv2 is running between the two routers. Now, the GigabitEthernet0/0 interface of one of the routers MSR-1 wants to only send RIP packets instead of Accept RIP protocol message, then which of the following implementation methods are feasible?

If a port running STP in the Ethernet switch receives and forwards data, receives, processes and sends BPDUs, and performs address learning, then the port should be in the ______ state.

The default data transfer port used by FTP is ______.