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What is also called Type 0 authentication in OSPF on Cisco Routers?
A. MD5
B. There is no Type 0 authentication
C. SHA1
D. Null
Answer: D
Explanation:
These are the three different types of authentication supported by OSPF. Null Authentication–This is also called Type 0 and it means no authentication information is included in the packet header. It is the default.
Plain Text Authentication–This is also called Type 1 and it uses simple clear-text passwords. MD5 Authentication–This is also called Type 2 and it uses MD5 cryptographic passwords.