Problem 4 a) When you run the traceroul program, can the RTT for the n-th router be longer than the RIT for the 1-? Explain briefly b) How many times are used on the sender side in Go-Back-s, Selective Repeat, and TCPT c) Why does TCP ignote retransmited segments in the citimation of the RTT! 3) Why do we need sequence numbers in reliable protocols e) Suppose you have just created a new startup and you reposter the domain name wystartup.com with a registrar. You provide the registrar with the names and IP addresses of your primary secondary authoritative DNS servers and the registrar inserts the corresponding DNS mm the TED com servers Assume that the names of your primary and secondary authoritative DNS se dni.mystartup.com and dns2.nyatartup.com, respectively, their 17 addresses are 212.212.212.1 and 212.212.212.2, respectively. Write down the DNS records in the form Anime, value type inserted by the rest in the TLD .com servers Assume your web page www.myatartup.com is hosted on a where with me wyprimaryserver.nystartup.cond IP address 212.212.212.2. W down the DNS records in your authoritative DNS servers that allow people to acces your web page Assume that the email addresses in your startup in the form usernamenstartup.com the hostname of your mail scris 11.nyatartup.con, and IP address is 212.212.212. 4. Winter records in your authoritative DNS servers for your mail