Disciplina :
Tecnologia e Redes De Computadores
Professora : Aluno
Priscila Doria
: André Luiz Amaral Teixeira Costa LABORATORIO - t!ernet" t!ernet " ARP e #$%&''
'& What is the 48-bit Ethernet address of your computer? R: (eu endere)o é -* +, : %+ : ea : +c : '$ :# :#
%& What is the 48-bit destination address in the Ethernet frame? Is this the Ethernet address of gaia.cs.umass.edu? What device has this as its Ethernet address?
R: O endere)o de destino .oi /# : % : #c : $/ : c/ : +." no caso esse é o endere)o de destino do meu roteador Tec!nicolor&
& Give the hexadecimal value for the to-byte !rame type field. What do the bit"s# hose value is $ mean ithin the flag field?
R: O 0alor 1exadecimal é $x$#$$ "Internet Protocol é o campo 2ue identi3ca o protocolo do cliente " no meu caso sendo o IP0,&
, & %o many bytes from the very start of the Ethernet frame does the &'(II )G* in )GE+* appear in the Ethernet frame?
R: Aparece no /4 56te
/& What is the hexadecimal value of the (,( field in this Ethernet frame? R: 78o existe o 0alor de CRC na 9anela do t!ernet&
. What is the value of the Ethernet source address? Is this the address of your computer or of gaia.cs.umass.edu "%int/ the anser is no#. What device has this as its Ethernet address?
R: O endere)o é /# : % : #c : $/ : c/ : +." esse endere)o n8o é do meu computador ou da url acessada " é o endere)o 2ue de destino do meu roteador " o endere)o para c!egar na min!a su5rede&
0. What is the destination address in the Ethernet frame? Is this the Ethernet address of your computer?
R: O endere)o de destino é +, : %+ : ea : +c : '$ :#& im é o endere)o do meu pc& 8. Give the hexadecimal value for the to-byte !rame type field. What do the bit"s# hose value is $ mean ithin the flag field?
R: O 0alor é $x#$$" ou se9a o protocolo usado continua sendo o IP0,
1. %o many bytes from the very start of the Ethernet frame does the &'(II )2* in )23* "i.e. the %++ response code# appear in the Ethernet frame?
R: Como na 2uest8o ," aparece nos mesmos /4 56tes& $5. What is the hexadecimal value of the (,( field in this Ethernet frame?
R: Como na 2uest8o / " n8o existe o 0alor de CRC na 9anela do t!ernet&
$$. Write don the contents of your computer6s &, cache. What is the meaning of each column value?
R: m ordem podemos o5ser0ar os ndere)os IP;s" os endere)os (AC;s e por ultimo o tipo de protocolo" se é din
$7. What are the hexadecimal values for the source and destination addresses in the Ethernet frame containing the &, reuest message?
R: O endere)o de origem é +, : %+ : ea : +c : '$ :# " 9= o endere)o de destino como é 5roadcast" é > : > : > : > : > : >
$9. Give the hexadecimal value for the to-byte Ethernet !rame type field. What do the bit"s# hose value is $ mean ithin the flag field?
R: 7o campo do tipo de protocolo " 0emos o 0alor em !ecadecimal $x$#$? 2ue representa uma mensagem ARP&
$4. a# %o many bytes from the very beginning of the Ethernet frame does the &, opcode field begin?
R: O Campo ARP code come)a ,% 56tes depois do inicio do t!ernet b# What is the value of the opcode field ithin the &,-payload part of the Ethernet frame in hich an &, reuest is made?
R: O 0alor do campo opcode dentro da mensagem ARP tem carga util de $x$$$' c# :oes the &, message contain the I address of the sender?
R: im " contém o endere)o de IP do emissor&
d# Where in the &, reuest does the )uestion* appear ; the Ethernet address of the machine hose corresponding I address is being ueried?
R: Aparece no endere)o (AC do destino& $<. =o find the &, reply that as sent in response to the &, reuest.
a# %o many bytes from the very beginning of the Ethernet frame does the &, opcode field begin?
R: @ o de '$ 56tes a partir do inicio& b# What is the value of the opcode field ithin the &,-payload part of the Ethernet frame in hich an &, response is made?
R: O 0alor do re2uest é '&
c# Where in the &, message does the )anser* to the earlier &, reuest appear ; the I address of the machine having the Ethernet address hose corresponding I address is being ueried?
R: ndere)o de (AC 2ue en0iou&: Tec!nic$/:c/:+. /# : % : #c : $/ : c/ :+. e Ip '4%&'?#&$&'
$. What are the hexadecimal values for the source and destination addresses in the Ethernet frame containing the &, reply message?
R: O 0alor em !exadecimal (AC do endere)o de destino é o +,:%+:ea:+c:'$:# & o 0alor em !exadecimal (AC do endere)o de origem /# : % : #c : $/ : c/ :+.
$0. 2pen the ethernet-ethereal-trace-1 trace file in http/>>gaia.cs.umass.edu>ireshar-labs>ireshar-traces.@ip. +he first and second &, pacets in this trace correspond to an &, reuest sent by the computer running Wireshar and the &, reply sent to the computer running Wireshar by the computer ith the &,-reuested Ethernet address. Aut there is yet another computer on this netor as indiated by pacet ; another &, reuest. Why is there no &, reply "sent in response to the &, reuest in pacet # in the pacet trace?
R: Por2ue o endere)o Ip e ARP n8o sao 0erdadeiros " ou se9a eles nao est8o coincidindo " por isso o pc n8o ira rece5er a mensagem de re2uest&
LABORATORIO #$%&'' $. What are the ''I:s of the to access points that are issuing most of the beacon frames in this trace?
R: Os IDs s8o $ (unroe t e o linEs6s'%&
7. What are the intervals of time beteen the transmission of the beacon frames the linksys_ses_24086 access point? !rom the 30 Munroe St . access point?
R: O inter0alo é de $&$4#'#/$$$ segundos&
9. What "in hexadecimal notation# is the source B&( address on the beacon frame from 30 Munroe St ?
R: O endere)o é (AC é $$:'?:5?:.+:'d:/'
4. What "in hexadecimal notation# is the destination B&( address on the beacon frame from 30 Munroe St ??
R: O endere)o é (AC é o do Broadcast >:>:>:>:>:> &
<. What "in hexadecimal notation# is the B&( A'' id on the beacon frame from 30 Munroe St ?
R: @ o mesmo endere)o da origem pois é um 2uadro 5eacon" ou se9a o endere)o é $$:'?:5?:.+:'d:/'& . +he beacon frames from the 30 Munroe St access point advertise that the access point can support four data rates and eight additional )extended supported rates.* What are these rates?
R: 8o suportados&: 'B" %B" /&/B e ''B" porem pode ser extendidas para ?&$" 4&$" '%&$" '#&$" %,&$" ?&$" ,#&$ e /,&$ (5ps&
0.!ind the 857.$$ frame containing the 'C= +( segment for this first +( session "that donloads alice.txt#. What are three B&( address fields in the 857.$$ frame? Which B&( address in this frame corresponds to the ireless host "give the hexadecimal representation of the B&( address for the host#? +o the access point? +o the first-hop router? What is the I address of the ireless host sending this +( segment? What is the destination I address? :oes this destination I address correspond to the host access point first-hop router or
some other netor-attached device? Explain.
R: 8o os endere)os (AC;s de origem e destino" endere)os do access point " s8o con!ecidos por endere)os Bid& Respecti0amente s8o os seguintes endere)os (AC;s&: Fireless 1ost - $$:':$%:d':5?:,. GG IP - '4%&'?#&'&'$4 Primeiro Roteador - $$:':$%:d':5?:., ndere)o de Destino - $$:'?:5?:.+:'d:/' GG IP -'%#&'44&%,/&'%
8. !ind the 857.$$ frame containing the 'C=&(3 segment for this +( session. What are three B&( address fields in the 857.$$ frame? Which B&( address in this frame corresponds to the host? +o the access point? +o the first-hop router? :oes the sender B&( address in the frame correspond to the I address of the device that sent the +( segment encapsulated ithin this datagram? "%int/ revie !igure <.$1 in the text if you are unsure of ho to anser this uestion or the corresponding part of the previous uestion. It6s particularly important that you understand this#.
R: ndere)o mac no campo do #$%&'' é $$:'?:5?:.+:'d:/' & Destino H $$:':$%:d':5?:,. Origem H $$:'?:5?:.+:'d:/' O endere)o (AC correspondente ao 1ost é o de destino H $$:':$%:d':5?:,.& (AC do primeiro salto é o de origem H $$:'?:5?:.+:'d:/'
1. What to actions are taen "i.e. frames are sent# by the host in the trace Dust a fter t=49 to end the association ith the 30 Munroe St & that as initially in place hen trace collection began? "%int/ one is an I-layer action and one is an 857.$$-layer action#. ooing at the 857.$$ specification is there another frame that you might have expected to see but don6t see here?
R: O endere)o D1CP de en0io é '4%&'?#&'&' & O !ost en0iou a DAT17TICATIO7 depois de $&$% segundos&
$5. Examine the trace file and loo for &F+%E=I(&+I2= frames sent from the host to an & and vice versa. %o many &F+%E=+I(&+I2= messages are sent from the ireless host to the linksys_ses_24086 & "hich has a B&( address of (iscoif
R: xistem '+ mensagens de AT17TICATIO7 do AP - IntelCord':5?:,.
$$. :oes the host ant the authentication to reuire a ey or be open?
R: im&
$7. :o you see a reply &F+%E=+I(&+I2= from the linksys_ses_24086 & in the trace?
R: 78o& $9. =o let6s consider hat happens as the host gives up trying to associate ith the linksys_ses_24086 & and no tries to associate ith the 30 Munroe St &. oo for &F+%E=I(&+I2= frames sent from the host to and & and vice versa. &t hat times are there an &F+%E=+I(&+I2= frame from the host to the 30 Munroe St & and hen is there a reply &F+%E=+I(&+I2= sent from that & to the host in reply?
R: xiste uma mensagem de AT17TICATIO7 en0iada de $$:':$%:d':5?:,. para $$:'?:5+:.+:'d:/'" no tempo de ?&'?44'$
$4. &n &''2(I&+E ,EHFE'+ from host to & and a corresponding &''2(I&+E ,E'2='E frame from & to host are used for the host to associated ith an &. &t hat time is there an &''2(I&+E ,EHFE'+ from host to the 30 Munroe St &? When is the corresponding &''2(I&+E ,EC sent?
R: AOCIAT RJT 0indo do !ost $ (unroe t AP at t H ?&'?44'$ e respondido em t H ?&'4%'$'&
$<. What transmission rates is the host illing to use? +he &? +o anser this uestion you ill need to loo into the parameters fields of the 857.$$ ireless &= management frame.
R: 8o Possi0eis '" %" /&/" ''" ?" 4" '%" '#" %," %" ,#" /, (5ps&
$. What are the sender receiver and A'' I: B&( addresses in these frames? What is the purpose of these to types of frames?
R: Re2uest H InterCord':5?:,." Rece5ido H Broadcast >:>:>:>:>:> B Id H Broadcast >:>:>:>:>:>
Response: ender H Cisco-Li.+:'d:/' Recei0er HInterCord':5?:,. B Id H Cisco-Li.+:'d:/'& O proposito da mensagem de sondagem é procurar um access point a partir da mensagem en0iada do !ost& A resposta para mensagem de sondagem é .eita atra0es do access point para o !ospedeiro&
