Which two authentication types does OSPF support? (Choose two.)

Which two authentication types does OSPF support? (Choose two.)
A . plaintext
B . MD5
C . HMAC
D . AES 256
E . SHA-1
F . DES

Answer: A,B

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.

Source: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13697-25.html

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