SNMP — Polls, Traps & v3 Security Model

Manager ↔ agent over UDP: queries on 161, traps/informs on 162. Devices expose a MIB tree addressed by OIDs; managers poll (GET/GETNEXT/GETBULK) or receive async TRAP (fire-and-forget) / INFORM (acknowledged). Version Security Notes v1 cleartext community legacy v2c still cleartext adds GETBULK, everywhere v3 auth (SHA) + priv (AES) the only correct choice; needs NTP […]