b) Consider a modification of DNS that runs over TCP rather than UDP and uses iterative queries. Suppose that Host A wants to obtain the IP address of Host B. Assume that the IP address of Host B is not cached in Host A or the local DNS server of Host A. Also assume that the local DNS server does not know the IP address of the TLD DNS server for the domain associated with Host B. Assume that the round trip time between all entities (between Host A and each DNS server and between DNS servers) in the system is RTT. Assume that this version of DNS runs over persistent TCP connections (A TCP connection will be closed only after the DNS response message is received by the querying agent) i) (4 pts) Write on the table given below the number of TCP connections that will be established between the entities in the corresponding row and the column of the table (Rows denote the TCP clients while columns denote the TCP servers. A value n in row i and column j will indicate that n TCP connections are established between the TCP client in rowi and TCP server in row j) TCP client/TCP server | Host A | Local DNS | TLD DNS Root DNS | Authoritative DNS Server Server Server Server Host A Local DNS Server TLD DNS Server Root DNS Server Authoritative DNS Server ii) (8 pts) Calculate the time from the initiation of the first TCP connection by Host A until Host A obtains the IP address of Host B