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Advance Computer Networks

Assignment 02

Distribution Date: 14.10.2015 Due Date: 21.10.2015

(6:05 p.m. or !ardcop" #ubmission on$" in t%e c$ass&

(5:'0 p.m. or )*+ai$ #ubmission)

Note Careu$$":

Plagiarismin assignment will be strictly checked and if any

question in any part of the assignment will be found to beplagiarized, the whole assignment will be graded to zero

mark.

In case of plagiarism from other assignment (in answer to

any question, both assignments will be graded to zero.

NO soft corner regarding plagiarism, so avoid it.

!o e"tension in due date will be granted to any student. #o

don$t forward this kind of request on the group.

)*mai$ submission

%ile name Must BEof the format &assignxx-your-name-

Roll number&

'he subect )eld of your email M!" BE *assignxx-full-

name-#$!E-roll-no&. %or e"ample, assign%&-your-name-

'-%&-&&&.

(Ot)er*ise assignment *ill not be accepted+

#end your e+mail to sohailafzal-/yahoo.com

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Q#01Reference=>Question#06 of Assignment#01

a)

NOTE:-

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YOU Guyz wi use A!o"e Gra$ %oncet

&'(*A+ O, ,ormua %oncetw$ic$ is gi"en in Question#- of Assignment# 01.

!)

Rc= / !sRs = !sR = 12 !s => *3uay ($are4 ,airy e4ium

5ow muc$ 5ROUG5U 7 &* it wi ta8e to transfer a9e size of 200!its from source:Rc) to 4estination:Rs);

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c)

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Q#02

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Consider distributing a fle o F = 20 Gbits to N peers. The server has anupload rate o us= 40 Mbps, and eah peer has a do!nload rate o d i= "Mbps and an upload rate o u. For N = 20, 200, and 2,000 and u = 400 #bps,$00 #bps, and " Mbps, prepare a hart giving the %ini%u% distribution ti%eor eah o the o%binations o N and u or both lient&server distribution and

'2' distribution.

Q#0-

a( )hat is a whoisdatabase*b( +se various whoisdatabases on the nternet to obtain the na%es o

t!o -N servers. ndiate !hih whoisdatabases /ou used.( +se nslookupon /our loal host to send -N ueries to three -N

servers1oal -N server and the t!o -N servers /ou ound in part 3b(. Tr/uer/ing or T/pe , N, and M5 reports. u%%ari6e /our fndings.

d( +se nslookupto fnd a )eb server that has %ultiple ' addresses.-oes the )eb server o C7 have %ultiple ' addresses*

e( +se the 8N whoisdatabase to deter%ine the ' address range usedb/ C7.

( -esribe ho! an atta9er an use whoisdatabases and the nslookuptool to peror% reonnaissane on an institution beore launhing an

atta9.

g( 8eall that a -N server higher in the -N hierarh/ delegates a -Nuer/ to a -N server lo!er in the hierarh/, b/ sending ba9 to the-N lient the na%e o that lo!er&level -N server 3fg 2.2: in boo9(.nitiate a seuene o ueries or the ' address or C7;s )eb serverb/ using nslookup. ho! the list o the na%es o -N servers in thedelegation hain in ans!ering /our uer/.

h( 8epeat part g( or several popular )eb sites, suh as google.o%,/ahoo.o%, or a%a6on.o%.

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