| Uses Community String in plain text form for authentication. | Uses Community String in plain text form for authentication. | Supports username and password based authentication. |
| Supports RO (READ ONLY GET) and RW (READ WRITE SET) restriction | Supports RO (READ ONLY GET) and RW (READ WRITE SET) restriction | Supports RO (READ ONLY GET) and RW (READ WRITE SET) restriction |
| Supports only 32 bit counters | Supports 32 and 64 bit counters | Supports 32 and 64 bit counters |
| Does not support encryption | Does not support encryption | Supports encryption DES, 3DES or AES |
| Community string is sent in plain text as encryption is not suppported | Community string is sent in plain text as encryption is not suppported | Username and password are sent in MD5 hash |
