Prominent Causes of Poor Quality of Service in Network Communication

Capacity overflows, heterogeneous delay and packet losses are the resultant factors of network congestion and overloading. Such sort of dominant factors degrade the Quality of Service (QoS) and finally the network enters in a state of communication cut off. In this article, firstly we have discussed salient foundations of poor QoS such as network congestion, link overloading, routing metrics, design conflicts, server-side-scripting, denial of service attacks, RFC congestion schemes and weakness of existing TCP protocols with comparative analysis. Secondly, we have contributed some experimental observations against social, non-social and multimedia networks to realize QoS through comparison of response latencies and transmission errors. The scope of this study is to identify maximum causes of poor QoS in order to judge the effect of loaded and normal network conditions upon end-to-end service quality in both experimental and theoretical prospective. Such sort of comprehensive effort has not been attempted yet in such capacity, as we have conducted in this article. Presented analysis and experimental observations are significantly noticeable to evolve forthcoming congestion control policies.