Which firewall chain you should use to filter SSH access to the router itself?

A network ready device is directly connected to a MikroTik RouterBOARD 750 with a correct U.T.P. RJ45 functioning cable. The device is configured with an IPv4 address of 192.168.100.70 using a subnet mask of
255.255.255.252. What will be a valid IPv4 address for the RouterBOARD 750 for a successful connection to the device?

What is the address range of a Class B network address in binary?

How long is level 1 (free) license valid?

You have 10 users plugged into a hub running 10Mbps half-duplex. There is a server connected to the switch running 10Mbps half-duplex as well. How much bandwidth does each host have to the server?