Find the first address, last address and the number of addresses of a network whose one of the IP addresses is 12.28.22.12 / 25.      Please Solve it briefly with one by one steps

You are given the network number of 86.30.88.0/20 with the following arrangement. (12 hosts) (30 hosts) You will need to create 4 subnets: Subnet A: 30 hosts Subnet B: 55 hosts Subnet C: 12 hosts Subnet D: 65 hosts (65 hosts) Z M (55 hosts) Finally, for each subnet created, you need to calculate and show: • The first, last and broadcast address • The subnet mask • Allocate IP numbers N

Ann is a CSULA student trying to access (https://www.calstatela.edu) from the campus library. Her request must use Domain Name System (DNS) resolution to translate the name (https://www.calstatela.edu) to an IP address. Assume that CSULA DNS name resolution uses iterated queries and her request first goes to the CSULA local DNS server shown in the figure. In the following picture: 1. Fill in the blanks to show all the servers in the DNS hierarchy this request must be sent to, starting from and including the root DNS server. 2. Draw arrows with sequence numbers showing the steps in the DNS resolution. The first and the last step in DNS resolution are shown in the figure.

An IP address can be written as a 32-bit number. For a class B network, the two most significant bits are set to 10. The 16 most significant bits are used as a network ID, and the 16 least significant bits are used as a host ID. However, the host ID cannot be all O's or all 1's. How many hosts (i.e., host IDs) can there be on a class B network? Type your answer.