Capitolo 11
description
Transcript of Capitolo 11
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
Capitolo 11
Gestione di rete e ricerca guasti
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
AgentAgent
Managed Device(per esempio router)
MIB
Network Management Station
Managing Managing EntityEntity
Network
Query
Response3
1
Network management protocol
2
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
variabile1 ottetto variabile
Nome ValoreTipooper.
variabile variabile
Nome Valore
variabile variabile
Nome Valore
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
t1
t2
A B
Collisione
Collision Window 512 bit-time
PREAM. SFD DSAP SSAP LEN. LLC PDU PAD FCS
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
PACCHETTOSQE Test500 ns Minimo1500 ns Nominale
deve finire entro 3000 ns
600 ns
min.
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
DS
AP
SS
AP
LE
N.
LL
C P
DU
PA
DF
CS
PR
EA
M.S
FDD
SA
PS
SA
PLE
N.
LLC
PD
U
PA
DFC
S
PREAM.S
FDDSAP
SSAPtY
PE
DATA
PADFC
S
PREAM.S
FDDSAP
SSAPLE
N.
LLC P
DU
PADFC
S
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
PREAM. SFD DSAP SSAP LEN. LLC PDU PAD FCS
BPDU: Root Identifier = 7D00.00E01E3E28ACBPDU: Priority = 7D00BPDU: MAC Address = 00E01E3E28ACBPDU: BPDU: Root Path Cost = 500BPDU: ...
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
guasto
PREAM. SFD DSAP SSAP LEN. LLC PDU PAD FCS
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
LAN Analyzer
PREAM.SFDDSAPSSAP LEN. LLC PDU PAD FCS
PREAM.SFDDSAPSSAP LEN. LLC PDU PAD FCS
PREAM.SFDDSAPSSAP LEN. LLC PDU PAD FCS
PREAM.SFDDSAPSSAP LEN. LLC PDU PAD FCS
08-00-5A-00-00-0108-00-2B-00-00-0108-00-20-00-00-01
Primo indirizzo del primo lotto di indirizi MAC di:
IBMDigital EquipmentSUN Microsystem
1
10
20
30
40
50
60 7
080
9010
0
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
LAN Analyzer
LAN Analyzer
R
Mirror port
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
Raccolta di
informazioni
Causa e soluzione
Test e verifiche
Analisi
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
2002
Da quando?
Dove?
Con quale frequenza?
In quali condizioni?
Particolarità collegate all’evento?Come si
manifesta?
1
10
20
30
40
50
60 7
080
9010
0
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
Incisione della guainaTaglio del cavo
Pinzatura del connettore RJ45
Connettore RJ45
Piattina a 8 conduttori
Cavo a 4 coppie ritorte
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
Contatto a lamaper conduttore a
trefoli
Contatto a forcellaper conduttore
solido
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
Blu
1 2 3 4 5 6 7 8
Bianco-Verde
Verde
Arancio
Bianco-Arancio
Bianco-Blu
Bianco-Marrone
Marrone
Chiavetta in basso
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“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl
Arancio
1 2 3 4 5 6 7 8
Bianco-Verde
Verde
BLUBianco-Arancio
Bianco-Blu
Bianco-Marrone
Marrone
Chiavetta in basso