Execute the following configuration commands on the router:
[Router] dhcp enable
[Router] server forbidden-ip 192.168.1.10
[Router] server forbidden-ip 192.168.1.254
[Router] dhcp server ip-pool 0
[Router-dhcp-pool-0] network 192.168.1.0 mask 255.255.255.0
[Router-dhcp-pool-0] gateway-list 192.168.1.254
[Router-dhcp-pool-0] dns-list 192.168.1.10
[Router-dhcp-pool-0] expired day 5
After completing the above configuration, which of the following statements are correct? (multiple choice)

A network connection is like:
HostA----GE0/0--MSR-1--S1/0---------S1/0--MSR-2--GE0/0----HostB
Two MSR routers MSR-1 and MSR-2 are interconnected back-to-back through their S1/0 interfaces, and their GE0/0 interfaces are respectively connected to the client hosts HostA and HostB. The IP address of HostA is 192.168.0.2/24, and the address of the S0/0 interface of MSR-2 is 1.1.1.2/30. By configuring other relevant IP addresses and routes, HostA can communicate with HostB in the current network.
Nowadays, the customer requires that HostA is not allowed to log in to the MSR-2 through Telnet at address 1.1.1.2.
So which of the following configurations can meet this requirement? (multiple choice)

The network administrator of a certain enterprise needs to set a subnet mask to divide the class C network 211.110.10.0 that he is responsible for into at least 8 subnets. How many subnet masks can be used for division? (multiple choice)

The customer's network is composed of two MSR routers interconnected, and the RIPv1 protocol is running between the two MSRs. The dynamic route learning has been completed and the remote route has been learned. Now the customer will modify RIPv1 to RIPv2, then the following will happen What are the possible changes? (multiple choices)

PPP has to go through a series of negotiation process before establishing the link, the correct negotiation sequence is ___. (Fill in the code of each step one by one, there can be no spaces in between, such as: ABC)