Huawei Certified ICT Expert – Routing and Switching (HCIE-RS) — Question 57

OSPFv2 is an IGP running on IPv4 networks, whereas OSPFv3 is an IGP running on IPv6 networks. OSPFv3 and OSPFv2 use the same types of packets, including Hello, DD, LSR, LSU, and LSAck packets. Which of the following statements is correct about OSPFv3 packets?

Answer options

• A. An OSPFv3 Hello packet carries the IPv6 address prefix of a router interface.
• B. OSPFv3 uses the link-local address as the source address for sending packets. Packets can be forwarded beyond the originating link.
• C. OSPFv3 uses the authentication field in the packet header for packet authentication.
• D. OSPFv3 uses IPv6 multicast addresses FF02::5 and FF02::6 to send OSPFv3 packets.

Correct answer: D

Explanation

The correct answer is D because OSPFv3 packets are indeed sent to the IPv6 multicast addresses FF02::5 and FF02::6, which are designated for OSPF routers. Option A is incorrect as the Hello packet does not carry the IPv6 prefix; it only includes the router's link-local address. Option B is misleading because OSPFv3 packets are not forwarded beyond the link-local scope by default, and option C is wrong since OSPFv3 does not use the authentication field in the packet header like OSPFv2 does.