LevelOne WAB-5120 - Manual (Page 52)

Access Type
Select “Read Only” or “Read and Write” accordingly.
Authentication Protocol
Select an authentication algorithm. SHA authentication is stronger than MD5 but is slower.
Privacy Protocol
Specify the encryption method for SNMP communication. None and DES are available.
None: No encryption is applied.
DES: Data Encryption Standard, it applies a 58-bit key to each 64-bit block of data.