The following description about OSPF packet authentication, which is wrong?

The following description about OSPF packet authentication, which is wrong?
A . The authentication modes supported by AR2200 are classified into null, simple, MD5 and HMAC-MD5 based on the encryption algorithm.
B . AR2200 supports two authentication modes: area authentication and interface authentication.
C . When both the area authentication mode and the interface authentication mode exist, use area authentication first.
D . Only authenticated OSPF packets are accepted. Otherwise, neighbors cannot be set up normally.

View Answer

Answer: C