H12-891_V1-0 practice question 6 of 35

If the Option field value in the 0SPFv3 Hello message issued by the router's GIgabit Ethermet0/0 interface is 0x000013, the following description is correct

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Answer options
A:

A. The Gigabit/thernetO/0/0 interface of Router A adds IPv6 routing to compute

 Correct answer
B:

B. Router A's Gigabit/thernetO/0/0 interface belongs to the NSSA zone
C:

C. Router A supports AS-An External-LSA flood

 Correct answer
D:

D. Router A is an OSPFv3 device with forwarding capability

 Correct answer
Correct Answer:
A. A. The Gigabit/thernetO/0/0 interface of Router A adds IPv6 routing to compute; C. C. Router A supports AS-An External-LSA flood; D. D. Router A is an OSPFv3 device with forwarding capability
Explanation

The Options field in an OSPFv3 Hello is 24 bits. 0x000013 sets the V6(0x01), E(0x02) and R(0x10) bits.
• V6 = 1 → the interface participates in IPv6 route calculation (A).
• E = 1 → AS-External-LSAs may be flooded through the area (C).
• R = 1 → the originating router can forward packets (D). The N-bit (NSSA) is 0, so the interface is not in an NSSA area; statement B is wrong.

Why Incorrect

B: N-bit is clear (0), therefore the interface is not part of an NSSA area.

References

1. RFC 5340 “OSPF for IPv6”, Appendix A.2, Table A.2 (“Options field bit assignments”).

2. Huawei, “OSPFv3 Configuration Guide”, VRP 8.180, §3.2.2 “Options Field”, pp. 66-67.

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