Communication networks are large distributed systems designed to send messages from one location to another. Messages are generated by a source and transmitted through a server to their destinations. Servers are connected by the transmission links through which the data flows, and each server has a certain queue capacity. When the number of incoming messages exceeds the capacity of the server or the outgoing link is busy, the incoming messages are stored in the queue. This study analyzes the traffic behavior of uncongested and congested communication networks on single-server and multiserver configurations, when the servers are connected in sequence. The performance of the uncongested and congested communication networks was measured in terms of packet drop rate, average end-to-end delay, throughput, network utilization, and network cost using the OMNET++ simulator. Unlimited and limited queue sizes for a server in the network were simulated to determine the interarrival rate for optimum performance metrics. The optimum throughput was determined based on the queue capacity for various interarrival rates.