Ques. $2($DNS$,10$ marks $CO2+CO3+CO5)$: An e$-$commerce company maintains following servers at its end:

Web server to host its website $($host name:

www$.$somecompany.co$.$ in$,$ IP Address: $210\mathrm{.}214\mathrm{.}50\mathrm{.}11)$

Mail server $($host name:

mailserver.somecompany.co$.$in$,$ IP Address: $210\mathrm{.}214\mathrm{.}50\mathrm{.}15)$

DNS server $($hostname:

dns$1.$somecompany.co$.$ in$,$ IP Address: $210\mathrm{.}214\mathrm{.}50\mathrm{.}16).$ Further details are;

MNNIT Allahabad DNS server hostname is

ganesh.mnnit.ac$.$in and IP is $210\mathrm{.}213\mathrm{.}50\mathrm{.}12.$

$.$co DNS server hostname:

dns$1.$co and IP is $210\mathrm{.}215\mathrm{.}50\mathrm{.}11$

$($in$)$ India DNS server hostname: dns$1.$ in and IP is $110\mathrm{.}120\mathrm{.}100\mathrm{.}5$

Root DNS server hostname: a$.$

root$-$servers.net and IP is $90\mathrm{.}15\mathrm{.}30\mathrm{.}5$

$($a$)$ Explain the process of resolving the name

www$.$somecompany.co$.$ in from any machine at MNNIT Hahabad under the assumption that it is not cached at the local DNS server and that the local DNS server has ot cached entry for the $.$co and $.$in DNS servers. Give the Resource Records which were returned during the solution. You only have to mention the Type and Value fields of Resource Records.

Suppose a mail has to be sent from

neeraj@mnnit.ac$.$in to

xyz@somecompany.co$,$in$.$ Explain the role of I considering both the users are using Web based email.