To configure Trunk on the link between Ethernet switches and allow the transmission of VLAN 10 and VLAN 20 information, you must configure ______ on the switch.

If the public network address of the NAT device is dynamically allocated by the operator through ADSL, in this case, you can use ______.

The correct statement below is ______. (Multiple choice)

The well-known port number of the transport layer protocol used by DNS is ______.

The customer's network connection looks like:
HostA----GE0/0--MSR-1--S1/0-----WAN-----S1/0--MSR-2--GE0/0----HostB
Both routers are factory default configuration.
The four interfaces of the router are configured with correct IP addresses. The two hosts HostA and HostB are configured with IP addresses and gateways. Assuming that all physical connections are normal, then ______. (Multiple choice)