It is required to set a subnet mask to divide the Class B network 172.16.0.0 into as many subnets as possible. Each subnet requires 15 hosts, so the subnet mask should be _____. (Dotted decimal format) slightly

Data segmentation is done in ______ in the OSI reference model.

Two empty-configured MSR routers MSR-1 and MSR-2 are interconnected back-to-back through their respective S1/0 interfaces, and their respective GigabitEthernet0/0 interfaces
Connect the client hosts HostA and HostB respectively:
HostA----GE0/0--MSR-1--S1/0---------S1/0--MSR-2--GE0/0----HostB
Then make the following configuration on the two routers:
Configuration on MSR-1:
[MSR-1]interface GigabitEthernet 0/0
[MSR-1-GigabitEthernet0/0]ip add 192.168.1.1 24
[MSR-1]interface Serial 1/0
[MSR-1-Serial1/0]ip address 30.3.3.1 30
[MSR-1]rip
[MSR-1-rip-1]network 0.0.0.0
Configuration on MSR-2:
[MSR-2]interface GigabitEthernet 0/0
[MSR-2-GigabitEthernet0/0] ip address 10.10.10.1 24
[MSR-2]interface Serial 1/0
[MSR-2-Serial1/0]ip address 30.3.3.2 30
[MSR-2]rip
[MSR-2-rip-1]network 10.10.10.0
[MSR-2-rip-1]network 30.3.3.1
According to the above configuration, the WAN interface between the two routers can communicate with each other, other physical links in the network are good, and the two hosts HostA,
HostB can ping the address of their gateway GigabitEthernet0/0, so the following statement is correct _____.

The correct statement about STP, RSTP and MSTP is ______. (Multiple choice)

If a port running STP in the Ethernet switch does not receive or forward data, receive, process and send BPDUs, and perform address learning, the port should be in the ______ state.