ospf4.txt

a.
link di backbone = A-D, D-B
router di backbone = {A,B,D}
router interni Area1 = C
router BA = {A,B,D}
router ASBR = -

b.
A verso Area1
A-LAN1, 3, R
LAN1-{A,B,C}, 0, N  <----- scelgo A come designated router
A-LAN3, 2, NS

A verso backbone
A-D, 1, R
A-LAN1, 3, NS
A-LAN2, 4, NS

B verso Area1
B-LAN1, 1, R
B-LAN3, 6, NS

B verso backbone
B-D, 5, R
B-LAN1, 1, NS
B-LAN2, 2, NS

D verso Area2
D-LAN1, 4, NS
D-LAN2, 5, NS
D-LAN3, 1, R

D verso backbone
D-A, 1, R
D-B, 5, R
D-LAN3, 1, NS

c.
RT(C)
LAN1, 1, -
LAN2, 1, -
LAN3, 3, A

RT(D)
LAN1, 4, A
LAN2, 5, A
LAN3, 1, -