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m trovo davanti questo esercizio,e non ho ben capito come svolgerlo

Definire la topologia della rete dall’analisi delle seguenti routing table.
Completare le routing table con gli indirizzi delle network direttamente connesse che sono state appositamente cancellate.



R1#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route

Gateway of last resort is not set

137.12.0.0/26 is subnetted, 8 subnets
R 137.12.27.0 [120/1] via 137.12.27.129, 00:00:12, Serial0/0
R 137.12.27.64 [120/2] via 137.12.27.129, 00:00:12, Serial0/0
C ___.__.__.___ is directly connected, Serial0/0
C ___.__.__.___ is directly connected, FastEthernet0/0
R 137.12.28.0 [120/2] via 137.12.27.129, 00:00:12, Serial0/0
R 137.12.28.64 [120/2] via 137.12.27.129, 00:00:12, Serial0/0
R 137.12.28.128 [120/3] via 137.12.27.129, 00:00:12, Serial0/0
R 137.12.28.192 [120/3] via 137.12.27.129, 00:00:12, Serial0/0
R 195.10.212.0/24 [120/1] via 137.12.27.129, 00:00:12, Serial0/0
R 195.10.213.0/24 [120/1] via 137.12.27.129, 00:00:12, Serial0/0
R 198.11.10.0/24 [120/2] via 137.12.27.129, 00:00:12, Serial0/0
R 198.11.20.0/24 [120/4] via 137.12.27.129, 00:00:12, Serial0/0




R2#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route

Gateway of last resort is not set

137.12.0.0/26 is subnetted, 8 subnets
C ___.__.__._ is directly connected, Serial0/1
C ___.__.__.__ is directly connected, FastEthernet0/0
R 137.12.27.128 [120/1] via 137.12.27.1, 00:00:12, Serial0/1
R 137.12.27.192 [120/2] via 137.12.27.1, 00:00:12, Serial0/1
C ___.__.__._ is directly connected, Serial0/0
C ___.__.__.__ is directly connected, Serial0/2
R 137.12.28.128 [120/1] via 137.12.28.2, 00:00:09, Serial0/0
R 137.12.28.192 [120/1] via 137.12.28.66, 00:00:06, Serial0/2
R 195.10.212.0/24 [120/1] via 137.12.27.1, 00:00:12, Serial0/1
R 195.10.213.0/24 [120/1] via 137.12.27.1, 00:00:12, Serial0/1
R 198.11.10.0/24 [120/2] via 137.12.27.1, 00:00:12, Serial0/1
R 198.11.20.0/24 [120/2] via 137.12.28.66, 00:00:06, Serial0/2
[120/2] via 137.12.28.2, 00:00:09, Serial0/0

R3#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route

Gateway of last resort is not set

137.12.0.0/26 is subnetted, 8 subnets
C ___.__.__._ is directly connected, Serial0/3
R 137.12.27.64 [120/1] via 137.12.27.2, 00:00:09, Serial0/3
C ___.__.__.___ is directly connected, Serial0/2
R 137.12.27.192 [120/1] via 137.12.27.130, 00:00:05, Serial0/2
R 137.12.28.0 [120/1] via 137.12.27.2, 00:00:09, Serial0/3
R 137.12.28.64 [120/1] via 137.12.27.2, 00:00:09, Serial0/3
R 137.12.28.128 [120/2] via 137.12.27.2, 00:00:09, Serial0/3
R 137.12.28.192 [120/2] via 137.12.27.2, 00:00:09, Serial0/3
C ___.__.___._/__ is directly connected, Serial0/0
C ___.__.___._/__ is directly connected, Serial0/1
R 198.11.10.0/24 [120/1] via 195.10.213.2, 00:00:04, Serial0/1
[120/1] via 195.10.212.2, 00:00:04, Serial0/0
R 198.11.20.0/24 [120/3] via 137.12.27.2, 00:00:09, Serial0/3





R4#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route

Gateway of last resort is not set

R 137.12.0.0/16 [120/1] via 195.10.212.1, 00:00:12, Serial0/0
[120/1] via 195.10.213.1, 00:00:12, Serial0/1
C ___.__.___._/__ is directly connected, Serial0/0
C ___.__.___._/__ is directly connected, Serial0/1
C ___.__.__._/__ is directly connected, FastEthernet0/0
R 198.11.20.0/24 [120/4] via 195.10.213.1, 00:00:12, Serial0/1
[120/4] via 195.10.212.1, 00:00:12, Serial0/0















R5#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route

Gateway of last resort is not set

137.12.0.0/26 is subnetted, 8 subnets
R 137.12.27.0 [120/1] via 137.12.28.1, 00:00:09, Serial0/0
R 137.12.27.64 [120/1] via 137.12.28.1, 00:00:09, Serial0/0
R 137.12.27.128 [120/2] via 137.12.28.1, 00:00:09, Serial0/0
R 137.12.27.192 [120/3] via 137.12.28.1, 00:00:09, Serial0/0
C ___.__.__._ is directly connected, Serial0/0
R 137.12.28.64 [120/1] via 137.12.28.1, 00:00:09, Serial0/0
C ___.__.__.___ is directly connected, Serial0/1
R 137.12.28.192 [120/1] via 137.12.28.130, 00:00:21, Serial0/1
R 195.10.212.0/24 [120/2] via 137.12.28.1, 00:00:09, Serial0/0
R 195.10.213.0/24 [120/2] via 137.12.28.1, 00:00:09, Serial0/0
R 198.11.10.0/24 [120/3] via 137.12.28.1, 00:00:09, Serial0/0
R 198.11.20.0/24 [120/1] via 137.12.28.130, 00:00:21, Serial0/1






R6#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route

Gateway of last resort is not set

137.12.0.0/26 is subnetted, 8 subnets
R 137.12.27.0 [120/1] via 137.12.28.65, 00:00:09, Serial0/0
R 137.12.27.64 [120/1] via 137.12.28.65, 00:00:09, Serial0/0
R 137.12.27.128 [120/2] via 137.12.28.65, 00:00:09, Serial0/0
R 137.12.27.192 [120/3] via 137.12.28.65, 00:00:09, Serial0/0
R 137.12.28.0 [120/1] via 137.12.28.65, 00:00:09, Serial0/0
C ___.__.__.__ is directly connected, Serial0/0
R 137.12.28.128 [120/1] via 137.12.28.194, 00:00:21, Serial0/1
C ___.__.__.___ is directly connected, Serial0/1
R 195.10.212.0/24 [120/2] via 137.12.28.65, 00:00:09, Serial0/0
R 195.10.213.0/24 [120/2] via 137.12.28.65, 00:00:09, Serial0/0
R 198.11.10.0/24 [120/3] via 137.12.28.65, 00:00:09, Serial0/0
R 198.11.20.0/24 [120/1] via 137.12.28.194, 00:00:21, Serial0/1









R7#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route

Gateway of last resort is not set

137.12.0.0/26 is subnetted, 8 subnets
R 137.12.27.0 [120/2] via 137.12.28.193, 00:00:06, Serial0/1
[120/2] via 137.12.28.129, 00:00:09, Serial0/0
R 137.12.27.64 [120/2] via 137.12.28.193, 00:00:06, Serial0/1
[120/2] via 137.12.28.129, 00:00:09, Serial0/0
R 137.12.27.128 [120/3] via 137.12.28.193, 00:00:06, Serial0/1
[120/3] via 137.12.28.129, 00:00:09, Serial0/0
R 137.12.27.192 [120/4] via 137.12.28.193, 00:00:06, Serial0/1
[120/4] via 137.12.28.129, 00:00:09, Serial0/0
R 137.12.28.0 [120/1] via 137.12.28.129, 00:00:09, Serial0/0
R 137.12.28.64 [120/1] via 137.12.28.193, 00:00:06, Serial0/1
C ___.__.__.___ is directly connected, Serial0/0
C ___.__.__.___ is directly connected, Serial0/1
R 195.10.212.0/24 [120/3] via 137.12.28.193, 00:00:06, Serial0/1
[120/3] via 137.12.28.129, 00:00:09, Serial0/0
R 195.10.213.0/24 [120/3] via 137.12.28.193, 00:00:06, Serial0/1
[120/3] via 137.12.28.129, 00:00:09, Serial0/0
R 198.11.10.0/24 [120/4] via 137.12.28.193, 00:00:06, Serial0/1
[120/4] via 137.12.28.129, 00:00:09, Serial0/0
C ___.__.__._/__ is directly connected, FastEthernet0/0

Uno schema della rete esiste, cioè queli sono in router direttamente connessi?

La rete 137.12.0.0 è subnettata con /26.
Dagli sh ip route puoi notare che sono utilizzate le reti 137.12.27.X e 137.12.28.X.
Poiché /26 ti divide lo /24 in 4 sottoreti, le reti che puoi trovare nelle tabelle di routing sono:
137.12.27.0
137.12.27.64
137.12.27.128
137.12.27.192
137.12.28.0
137.12.28.64
137.12.28.128
137.12.28.192

Nella tabella di routing le sottoreti appaiono in ordine, quindi basta inserire la sottorete giusta nel campo vuoto.
(es: nel router1 ti mancano le due reti 137.12.27.128 e 137.12.27.192).

Dopo aver completato le tabelle di routing, basta mettere i router uno vicino all'altro in base alle reti connesse (quelle con la C) uguali.