Final answer:
The important parameters that can cause propagation and transmission delays are network traffic and packet size.
Step-by-step explanation:
The important parameters that can cause propagation and transmission delays are network traffic and packet size. Network traffic refers to the amount of data being transmitted on a network at any given time. If there is high network traffic, it can lead to congestion and delays in data transmission. Packet size refers to the amount of data that is being sent in each packet. If the packet size is large, it can take longer for the data to be transmitted.