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3.0 IP Routing

OSPFv3 for IPv6 Practice Questions

New in CCNA v2.0

Single-area OSPFv3 adjacencies, router ID, point-to-point and broadcast networks, and DR/BDR.

CCNA v2.0 objectives 3.3.b, 3.3.c, 3.3.d · objective map

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One solved question, so you can see how these are marked

Which routing protocol is the OSPF version defined for IPv6?

OSPFv3

OSPFv2 carries IPv4 routes and OSPFv3 was defined for IPv6. Modern implementations can also carry IPv4 in OSPFv3 through address families.

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All 10 OSPFv3 for IPv6 questions in this set

Answers and explanations appear when you work through the set above.

  1. Which address does an OSPFv3 router use as the source of its hello packets on an ordinary, non-virtual-link interface?

    • The interface link-local address
    • The global unicast address
    • The loopback address
    • The multicast address FF02::5

  2. Which multicast address do OSPFv3 routers use to reach all OSPF routers on a link?

    • FF02::5
    • 224.0.0.5
    • FF02::1
    • FF02::A

  3. A router running only IPv6 has no IPv4 addresses configured, and OSPFv3 will not start. What is missing?

    • A manually configured 32-bit router ID
    • An IPv6 loopback in area 1
    • A network statement with a wildcard mask
    • A DHCPv6 pool

  4. How is OSPFv3 enabled on an interface using the traditional configuration style?

    • ipv6 ospf 1 area 0 under the interface
    • network 2001:db8::/64 area 0 under the process
    • ospf enable ipv6 under the router
    • ip ospf 1 area 0 under the interface

  5. Which command shows OSPFv3 neighbour adjacencies for IPv6?

    • show ipv6 ospf neighbor
    • show ip ospf neighbor
    • show ipv6 neighbors
    • show ospf ipv6 database only

  6. Two routers are connected over a point-to-point Ethernet link. What is the benefit of configuring the OSPF network type as point-to-point?

    • No DR/BDR election takes place, so the adjacency forms and reaches FULL faster
    • Hello packets are no longer required
    • The link cost becomes zero
    • Authentication is enabled automatically

  7. On a broadcast segment, how is the OSPF DR chosen?

    • The highest interface priority wins, and the highest router ID breaks a tie
    • The lowest interface priority wins
    • The router with the lowest router ID always wins
    • The router with the most interfaces wins

  8. How does a router choose an OSPF router ID when none is configured?

    • The highest loopback IPv4 address, otherwise the highest active physical interface IPv4 address
    • The lowest interface MAC address
    • The highest IPv6 global address
    • The address of the first neighbour

  9. What is the default administrative distance of OSPF routes, for both OSPFv2 and OSPFv3?

    • 110
    • 90
    • 120
    • 1

  10. Two routers share a link with OSPFv3 enabled on both. One router lists the other in the INIT state, and the other router shows no neighbor at all. Which is the most likely cause?

    • Hello packets are reaching only one of the routers, for example because a filter drops them in one direction
    • The routers use different OSPF process IDs
    • The routers have different host names
    • Both interfaces have global addresses in the same /64