The industrial units adapt different networks for the management of their units, processes and resources. The
industrial sector uses different networks for their smooth functioning which would require accessing various network
services by their users, employees and customers. However, the industrial networks arenot exemptions from network
threats. Number of threats exist which challenge the functioning of industrial network like DDoS (Distributed Denial
of Service), black hole, eavesdrop attack and so on. Most attacks focus towards degrading the QoS performance of
industrial network. To handle this, different approaches are available in literature which works based on several
features like traffic, hop count, payload, service frequency, retransmission frequency, node behaviors, and location of
nodes and so on. Similarly, most threats occur over the routing procedure. Towards maximizing the QoS of industrial
network, it is necessary to analyze various routing protocols and their way of handling different threats. This article
analyzes various routing protocols and threats towards QoS of Industrial networks.