Refer to the exhibit. Area 10 is a regular OSPF area and networks 10.1.1.0/24 and 172.16.1.0/24 are internal. Which design provides optimal routing between both networks when the link between…

The correct answer is A. Move the link between routers C and D to area 10. Because of the SPF algorithm. OSPF calculates intra-area routes before inter-area routes. If the link between C and D was in area 0, C would calculate C-F-D-E as the shortest route, which isn't true. If the link between C and D is in area 10, C will calculate C-D-E as the…

Advanced Addressing and Routing Solutions

Question

Refer to the exhibit. Area 10 is a regular OSPF area and networks 10.1.1.0/24 and 172.16.1.0/24 are internal. Which design provides optimal routing between both networks when the link between routers C and E fails?

Exhibit

Options

AMove the link between routers C and D to area 10.
BCreate an OSPF virtual link between routers E and F.
CCreate a tunnel between routers E and F in area 10.
DMake area 10 a not-so-stubby area.

How the community answered

(58 responses)

A
79% (46)
B
12% (7)
C
3% (2)
D
5% (3)

Explanation

Because of the SPF algorithm. OSPF calculates intra-area routes before inter-area routes. If the link between C and D was in area 0, C would calculate C-F-D-E as the shortest route, which isn't true. If the link between C and D is in area 10, C will calculate C-D-E as the shortest route.

Topics

#OSPF#OSPF Area Design#Routing Redundancy#ABR

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