300-510 · Question #292
Refer to the exhibit. A network engineer is installing two new routers to connect a small company's headquarters via router R1 and a branch office via R2. The engineer configured OSPF on both…
The correct answer is D. Configure the network 10.0.1.0 0.0.0.255 area 0 command. On R1, the MAN link (10.0.1.0/24) must be in Area 0 for R1 and R2 to form their backbone adjacency. As an ABR, R1 needs at least one interface in Area 0 (the MAN link) and one in Area 1 (its LAN). If you’ve only configured its LAN under Area 1, OSPF never brings up the Area 0…
Question
Refer to the exhibit. A network engineer is installing two new routers to connect a small company’s headquarters via router R1 and a branch office via R2. The engineer configured OSPF on both routers using process ID 1 for consistency. R1 has been designated as an ABR for Area 0 and Area 1, and R2 is located in Area 0. After completing the initial configuration and bringing up the two devices, the engineer noticed that the ABR at headquarters is failing to advertise routes to the branch office within Area 0. Which additional action must the engineer take on R1 to resolve the issue?
Exhibit
Options
- AConfigure the summary-address 10.0.0.0 0.0.0.255 area 0 command under the OSPF process.
- BConfigure the router ospf 1 area 1 network 10.0.1.0 0.0.0.255 command.
- CConfigure the area 1 range 10.0.0.0 0.0.0.255 command under the OSPF process.
- DConfigure the network 10.0.1.0 0.0.0.255 area 0 command.
How the community answered
(42 responses)- A5% (2)
- B14% (6)
- C10% (4)
- D71% (30)
Explanation
On R1, the MAN link (10.0.1.0/24) must be in Area 0 for R1 and R2 to form their backbone adjacency. As an ABR, R1 needs at least one interface in Area 0 (the MAN link) and one in Area 1 (its LAN). If you’ve only configured its LAN under Area 1, OSPF never brings up the Area 0 side, so nothing from Area 1 is ever injected into the backbone. network 10.0.1.0 0.0.0.255 area 0 on R1 brings up that interface in Area 0, establishes the R1–R2 adjacency, and allows routes learned in Area 1 to be advertised to R2 and beyond.
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