Which two authentication mechanisms are supported by SNMPv3 ?(Choose two)

SHA (Secure Hash Algorithm) is a commonly supported authentication protocol in SNMPv3, used to verify the integrity and origin of SNMP messages.

Using a username without a password would provide no authentication and contradict the security enhancements of SNMPv3.

SNMPv3 uses a User-based Security Model (USM) which requires a username and password (or authentication key) for authenticating users before granting access to network devices.

DES (Data Encryption Standard) is an encryption algorithm used for privacy (confidentiality) in SNMPv3, not for authentication.

A community string is the authentication method used by SNMPv1 and SNMPv2c, which is replaced by username-based authentication in SNMPv3.

265-bit AES (Advanced Encryption Standard with a likely typo for 256-bit key) is an encryption algorithm for privacy in SNMPv3, not an authentication mechanism.