Registration No$.$

resolving the name

www$.$iitd.ernet.in from PIT Allahabad, a machine PC$11$ is used; ns$1$ is the local DNS server. Explain the process of intermediate DNS servers as follows:

MNNIT Allahabad DNS server name: nsI and IP $210\mathrm{.}213\mathrm{.}50\mathrm{.}11$

iitd DNS server name: iitkdns and IP $210\mathrm{.}214,50\mathrm{.}11$

ernet DNS server name:

ernetdnsl.ernet.in and IP $210\mathrm{.}215\mathrm{.}50\mathrm{.}11$

in DNS server name: indns$1,$ in and IP $110\mathrm{.}120\mathrm{.}100\mathrm{.}5$

Root DNS server name: root and IP $90\mathrm{.}15\mathrm{.}30\mathrm{.}5.$

$2$: Clearly mention NS$-$Record at each server. Anything else, assume and state clearly, $[10]$

$2$: Consider TCP implementation, How is RTT calculated, and give

R$.$ Segment numbers $S4$ and $S8$