Comprehensive and Detailed Explanation From Exact Extract:
SolarWinds' log processing policies for svslog (syslog) and traps (SNMP traps) are processed independently and concurrently. This is because syslog and SNMP trap processing are separate services with their own processing pipelines, unlike the global pre and post policies which affect overall log routing or rule order.
Reference:
"Syslog and SNMP trap processing policies run independently and in parallel to process messages as they are received by their respective services."
- (Log Analyzer Administrator Guide, Log Processing and Policy Handling section)

UDP port 2055 is the default port for NetFlow data (flow analysis), while SNMP (port 161) is required for CBQoS monitoring. SolarWinds NTA receives flow traffic on UDP 2055, and SNMP is used for polling CBQoS statistics from devices.
Reference:
" The default port for NetFlow data is UDP 2055, and SNMP polling occurs over port 161. CBQoS statistics require SNMP polling. "
- (Network Performance Monitor Administrator Guide, NetFlow and CBQoS Requirements section)

Device Studio supports the following data sources:
Calculated result from transformation of polled values: You can apply calculations (such as average, sum, transformation) to the raw polled data.
Polled value by a device on an object ID: Device Studio can directly poll an OID from a device and use its value for monitoring.
Night/day standard deviation and predicted/baseline values are not direct data sources in Device Studio.
References:
NPM Administrator Guide: Device Studio Data Sources and Calculations