ctt105 5 device
DESCRIPTION
hhTRANSCRIPT
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Chng 05Thit b mng
MNG5MY5TNHThng 09/2013
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Ni dung
!Cc thit b mng!Collision8domain8&8Broadcast8domain
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Collision!Collision8(ng ):8khi c hai hay8nhiunode8cng gi DL8ln ng truyn chia scng lc
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Gii thiu
!Chc nng" H tr truy cp mng
NIC" Dng phn tch mng hoc m rng mng
Router Switch,8Bridge,8hub,8repeater,8gateway
" Dng truy cp t xa Modem,8ADSL8modem
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Cc thit b mng
!Tng 1:8modem,8repeater,8hub!Tng 2:8bridge,8switch!Tng 3:8router!Khc:8NIC,8access8point
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Modem5E 1
!MODEM5=5MOdulate and8DEModulate!L thit b cho php cc my tnh truyn thng vinhau qua8mng in thoi
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Modem5E 2
!Chc nng:" iu ch [Modulate]:8chuyn i tn hiu s (digital)8trn
my tnh thnh tn hiu tng t (analog)8trn in thoi." Gii iu ch [Demodulate]:8chuyn i tn hiu tn hiu
tng t trn in thoi thnh tn hiu s trn my tnh
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Repeater5E 1
!Repeater l thit b mng ni kt 2 nhnh mng" nhn tn hiu mt nhnh mng" khuych i tn hiu (khng x l ni dung)" truyn i tip vo nhnh mng cn li
!S lng repeater trong 1 mng LAN c hn
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Repeater5 minh5ha tn hiu mng
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Hub
!L thit b mng cho php tp kt dy dn mng!Tn hiu vo 1 port ca Hub s c chuyn ra tt c cc
port" Mi port8l 18shared8link
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Hub5 minh5ha tn hiu mng
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Hub5 phn loi
!Passive hub:" Khng khuych i tn hiu
!Active Hub" Khuych i tn hiu" Nh 1 repeater nhiu cng
!Intelligent Hub" L 1 active hub" Chuyn mch (switching): chuyn tn hiu n ng port
ca my nhn
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Repeater5&5hub
!Chc nng:8Ti sinh tn hiu mng v chuyn tnhiu mng n cc segment8mng cn li
!c im:" Khng th lin kt cc segment
Khc ng mng Khc phng php truy cp ng truyn dng phng tin truyn dn khc nhau
" Khng th nhn dng8packet" Khng cho php gim ti mng" Cho8php m rng mng d dng
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Bridge5E 1
!L thit b mng cho php ni kt 2 nhnh mngvt l
!Chc nng:8chuyn c chn lc cc gi tin8nnhnh mng cha trm nhn gi tin." Duy tr bng a ch
MAC8 Port khi to v duy tr t ng hoc th cng
" Nu trm nhn cng segment8vi trm gi,8hy gi tin8ngc li chuyn gi tin8n segment8ch
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Bridge5 minh5ha tn hiu mng
00000CAAAAAA
A B
C D
00000CBBBBBB
00000CCCCCCC 00000CDDDDDD
00000CAAAAAA 00000CDDDDD
1
2
MAC Address Port00000CAAAAAA 100000CBBBBBB 100000CCCCCCC 200000CDDDDDD 2
D
Src MAC Dst MAC
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Bridge5 minh5ha tn hiu mng
00000CAAAAAA
A
C D
00000CBBBBBB
00000CCCCCCC 00000CDDDDDD
1
2
MAC Address Port00000CAAAAAA 100000CBBBBBB 100000CCCCCCC 200000CDDDDDD 2
D
B
Src MAC Dst MAC
00000CAAAAAA 00000CBBBBB
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Bridge5E 3
!c im:" Cho php m rng cng mt mng logic vi nhiu kiu chy
cp khc nhau" Tch mt mng thnh nhiu phn nhm gim lu lng
mng.8" Chm hn repeater do phi x l cc gi tin" Khng c kh nng tm ng i ti u trong trng hp c
nhiu ng i." t tin hn repeater
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Switch5E 1
!L 18bridge8nhiu port!H tr fullduplex!Duy tr bng CAM8(Content8Addressable8Memory)
" MAC8 Port
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Switch5E 2!Chc nng:
" Hc a ch MAC8(self8learning)" Filtering/Forwarding" Trnh loop
!Cc ch chuyn mch:" Storeandforward
c ht ni dung8gi tin m bo chnh xc
" Cutthrough c 148bytes8u tin Khng pht hin c gi tin8b li
" Fragmentfree c 18phn gi tin
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Switch5 hc a ch mac E 1
MAC$addr port TTL
Nhn gi tin
flood
Gin port tng ng
Dest -MAC c trongswitch table?
NN
YY
Ghi nhn link tng ng vi host gi
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Switch5 hc a ch mac E 2
A
A
B
B
C
C
1 23
45
6
A22A
Source:2ADest:2A Switch2table2
(gi s ban2u rng)
A2AA2AA2AA2AA22A
A22A
MAC$addr port TTLMAC$addr port TTL
A 1 60
MAC$addr port TTL
A 1 60
A 4 60
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Switch5 hc a ch mac E 3
!Hi:8Khi A8gi cho F818gi tin???
A
B
S1
C D
E
FS2
S4
S3
H
I
G
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Switch5 VLAN
!VLAN8=8Virtual8LAN!Nhm mt s port8thnh 18mng LAN8o
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Router
!Chc nng:" Ni kt cc mng logic khc nhau." S dng a ch logic (IP) x l gi tin
" nh tuyn (Routing) Chy cc thut ton nh tuyn (OSPF, RIP, BGP,) # to ra bngnh tuyn
" Chuyn tip (Forwarding) Chuyn gi tin t cng vo (incoming port) ra cng ra (outcoming
port)
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NIC
!NIC8=8Network8Interface8Card!L thit b chuyn i tn hiu my tnh thnh tnhiu trn phng tin truyn dn v ngc li
!Cung cp kt ni vt l n phng tin truyndn
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Access5Point
!L8thit8b8cho8php8thit8b8truy8cp8mng8khng8dy
!ng8vai8tr8nh818hub!Thnh8phn:" B8thu:8thu8tn8hiu8radio8v8chuyn8thnh8tn8hiu8mng" B8pht:8chuyn8tn8hiu8mng8thnh8tn8hiu8radio
!Ngy8nay,8mt8s8AP8cn8tch8hp8chc8nng8ca818Router
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THIT5B5MNG
Nhu cu Thit bKt ni nhiumy tnh trong 12Net SW,2Hub,2BridgeKt ni nhiu Net RouterTruyn qua2in thoi ModemKo di dy cp RepeaterThit lp mng khng dy AP
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Ni dung
!Cc thit b mng!Collision8domain8&8Broadcast8domain
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Collision5domain5E Broadcast5domain5
!Collision8domain8(min ng ):8l min c kh nngxy ra ng " L min dng chung (chia s)" Hai segment8thuc cng 18collision8domain8nu chng gy racollision8khi ng thi gi d liu xung ng truyn
!Broadcast8domain8(min broadcast):8l min nhnc gi tin8broadcast" Gm nhiu collision8domain8(18 n)" Collision8domain8A88v B8thuc cng 18broadcast8domain8nucc node8mng trong collision8domain8B8nhn c gi tin8broadcast8t 18node8trong collision8domain8A
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Cc thit b mng
!Thit b m rng collision8domain:" Repeater" Hub"
!Thit b phn tch collision8domain" Switch" Bridge
!Thit b phn tch broadcast8domain" Router
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V d 1
Bridge Switch
Collision Domains:
Broadcast Domains:
Hub Router
1
1
4
1
4
1
4
4
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V d 2
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Ti liu tham kho
!Slide8ca J.F8Kurose8and8K.W.8Ross8v Computer8Networking:8A8Top8Down8Approach
!http://www.eie.polyu.edu.hk/~ensmall/eng224