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| Question ID 16089 | What are two enhancements that OSPFv3 supports over OSPFv2? (Choose two.)
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| Option A | It requires the use of ARP.
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| Option B | It can support multiple IPv6 subnets on a single link.
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| Option C | It supports up to 2 instances of OSPFv3 over a common link.
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| Option D | It routes over links rather than over networks.
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| Correct Answer | B,D |
Explanation Explanation: Here is a list of the differences between OSPFv2 and OSPFv3: ✑ They use different address families (OSPFv2 is for IPv4-only, OSPFv3 can be used for IPv6-only or both protocols ✑ OSPFv3 introduces new LSA types ✑ OSPFv3 has different packet format ✑ OSPFv3 uses different flooding scope bits (U/S2/S1) ✑ OSPFv3 adjacencies are formed over link-local IPv6 communications ✑ OSPFv3 runs per-link rather than per-subnet ✑ OSPFv3 supports multiple instances on a single link, Interfaces can have multiple IPv6 addresses ✑ OSPFv3 uses multicast addresses FF02::5 (all OSPF routers), FF02::6 (all OSPF DRs) ✑ OSPFv3 Neighbor Authentication done with IPsec (AH) ✑ OSPFv2 Router ID (RID) must be manually configured, still a 32-bit number Reference: http://www.networkworld.com/article/2225270/cisco-subnet/ospfv3-for-ipv4-and- ipv6.html
| Question ID 16090 | Which command is used to display the collection of OSPF link states?
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| Option A | show ip ospf link-state
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| Option B | show ip ospf lsa database
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| Option C | show ip ospf neighbors
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| Option D | show ip ospf database
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| Correct Answer | D |
Explanation Explanation: The show ip ospf database command displays the link states. Here is an example: Here is the lsa database on R2. R2#show ip ospf database OSPF Router with ID (2.2.2.2) (Process ID 1) Router Link States (Area 0) Link ID ADV Router Age Seq# Checksum Link count 2.2.2.2 2.2.2.2 793 0x80000003 0x004F85 2 10.4.4.4 10.4.4.4 776 0x80000004 0x005643 1 111.111.111.111 111.111.111.111 755 0x80000005 0x0059CA 2 133.133.133.133 133.133.133.133 775 0x80000005 0x00B5B1 2 Net Link States (Area 0) Link ID ADV Router Age Seq# Checksum 10.1.1.1 111.111.111.111 794 0x80000001 0x001E8B 10.2.2.3 133.133.133.133 812 0x80000001 0x004BA9 10.4.4.1 111.111.111.111 755 0x80000001 0x007F16 10.4.4.3 133.133.133.133 775 0x80000001 0x00C31F