### Instruction:

Extract the cause and effect entities from the following sentence:
However it may cause a bottleneck process from the sensor nodes if there is excessive traffic on the network

### Assistant:

KEYWORD: if there
CONDITION: may cause a bottleneck process from the sensor nodes
CAUSE_1: is excessive traffic on the network
VARIABLE: traffic on the network
EFFECT_1: it may cause a bottleneck process from the sensor nodes
NOT_RELEVANT: However

