Two empty-configured MSR routers are directly connected back-to-back through their respective WAN Serial1/0 interfaces, and their interconnection network segment is 192.0.0.0/24.
At the same time, the two routers are connected to their respective LAN segment users through their respective GigabitEthernet0/0:
HostA----GE0/0--MSR-1--S1/0---------S1/0--MSR-2--GE0/0----HostB
Configure RIPv1 on the two routers, and now both routers have learned the RIP route of the opposite LAN segment. So which of the following statements are correct?

The customer router MSR-1 configures the MP to connect to the MSR-2 through interfaces S0/0 and S0/1. Currently, the MP is running normally. At the same time, the two routers run RIP to complete the route learning of the LAN segment of the two routers. Then the Metric value of the RIP route learned on MSR-1 may be ______. (Multiple choice)

An empty-configured MSR router connects to the frame relay network through interface S1/0.
To achieve connectivity by configuring the frame relay sub-interface on this router, the correct description of the frame relay sub-interface is ______. (Multiple choice)

The correct statement about the OSI reference model is ______.

The PC is connected to the port E1/0/2 of the switch SWA, the IP address is 10.1.1.1, and the MAC address is 00-01-02-01-21-23. To ensure network security, you need to configure MAC+IP+ port binding on port E1/0/2.
Which of the following commands is correct?