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Which field is specific to the OPSFv3 packet header, as opposed to the OSPFv2 packet header?
Correct Answer: D
Explanation/Reference: Explanation: In OSPFv3, Instance ID is a new field that is used to have multiple OSPF process' instance per link. By default it is 0 and for any additional instance it is increased, instance ID has local link significance only. OSPFv3 routers will only become neighbors if the instanceIDs match. It is thus possible to have multiple routers on a broadcast domain and all run Ospfv3 but not all of them becoming neighbors. ReferencE. https://supportforums.cisco.com/document/97766/comparing-ospfv3-ospfv2-routing- protocol