Which three fields are optional in an OSPFv3 external LSA?

Which three fields are optional in an OSPFv3 external LSA? (Choose three.)

Which three fields are optional in an OSPFv3 external LSA? (Choose three.)

A.
Forwarding Address

B.
External Route

C.
Link-State ID

D.
Option

E.
Prefix Options

Explanation:
AS-External LSA
As with OSPFv2, the AS-External LSA advertises prefixes external to the OSPF routing domain;
one LSA is required for each external prefix advertised. However, the format of the OSPFv3 AsExternal LSA (Figure 9-10) is different from its OSPFv2 counterpart.
Figure 9-10. OSPFv3 AS-External LSA

http://fengnet.com/book/CCIE%20Professional%20Development%20Routing%20TCPIP%20Volu
me%20I/images/09fig10_alt.jpg



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