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Which three statements about OSPFv2 or OSPFv3 authentication are true?

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Which three statements about OSPFv2 or OSPFv3 authentication are true? (Choose three.)
A. On Cisco IOS XR platforms, OSPFv3 authentication can be configured at the OSPF routing process, area, or interface level.
Real 15
Cisco 640-878 Exam
B. OSPF authentication on Cisco IOS and IOS XE platforms can be configured per area or per interface.
C. On Cisco IOS and IOS XE and IOS XR platforms, the authentication key can only be configured per interface.
D. OSPFv3 uses IPsec for authentication and encryption.
E. On Cisco IOS XR platforms, the OSPF authentication that is configured for the area overrides the authentication that is configured for the interface.
F. On Cisco IOS and IOS XE platforms, the two OSPFv2 authentication methods that are supported are MD5 and SHA1.
Correct Answer: ABD

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