Implementing Cisco Network Security (IINS, legacy) — Question 124

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

Answer options

• A. plaintext
• B. MD5
• C. HMAC
• D. AES 256
• E. SHA-1
• F. DES

Correct answer: A, B

Explanation

OSPF supports plaintext and MD5 for authentication. While plaintext is an unencrypted method, MD5 provides a more secure way to verify the integrity of OSPF packets. The other options, such as HMAC, AES 256, SHA-1, and DES, are not supported by OSPF for authentication purposes.