1.) Name at least four different application layer protocols other than HTTP. For each, describe the purpose of the protocol, and give a brief overview of the methodology of its operation? 2.)Explain the purpose of an authoritative domain name server. How does its purpose differ from that of a local DNS server? 3.)Why does the IP datagram require separate fields for the header length and the total datagram length, instead of combining both into a single value? 4.)What is the purpose of an IP address mask? Suppose an IP address is identified as 222.44.66.88/24. What is the network address in this case? What is the host address? Howmany hosts can this network address support? Repeat this exercise for the IP address 200.40.60.80/26?

need answers for all of them