Refer to the exhibit. An engineer is designing an OSPF network for a client. Requirements dictate that the routers in Area 1 should receive all routes belonging to the network, including EIGRP…

The correct answer is A. Make area 1 a NSSA. A Not-So-Stubby Area (NSSA) is the correct solution. A standard stub area blocks all external routes (Type 5 LSAs), which would also block the EIGRP routes - violating the requirement. A standard OSPF area accepts all external routes including RIP, which also violates the…

Advanced Addressing and Routing Solutions

Question

Refer to the exhibit. An engineer is designing an OSPF network for a client. Requirements dictate that the routers in Area 1 should receive all routes belonging to the network, including EIGRP, except the ones originated in the RIP domain. Which action should the engineer take?

Exhibit

Options

AMake area 1 a NSSA.
BMake area 1 a stub.
CMake area 1 a standard OSPF area.
DMake the area 1 routers part of area 0.

How the community answered

(40 responses)

A
68% (27)
B
10% (4)
C
18% (7)
D
5% (2)

Explanation

A Not-So-Stubby Area (NSSA) is the correct solution. A standard stub area blocks all external routes (Type 5 LSAs), which would also block the EIGRP routes - violating the requirement. A standard OSPF area accepts all external routes including RIP, which also violates the requirement. Making Area 1 routers part of Area 0 changes the topology unnecessarily. An NSSA blocks incoming Type 5 LSAs (which carry RIP external routes redistributed at the backbone ABR) while still allowing external routes redistributed directly at the NSSA ABR to enter as Type 7 LSAs. If EIGRP is redistributed at the NSSA boundary, those routes propagate into Area 1, while RIP routes originating from a different OSPF external injection point are blocked by the NSSA behavior.

Topics

#OSPF Area Types#OSPF NSSA#Routing Protocol Design#Route Filtering

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