Evaluation of Efficient Factors on Quality of Service in Routing Protocols, and its Role in Passive Defense

With increasing cyber network services that have real-time characteristics, ensuring the timely and accurate dissemination of information packets to its destination, has become a matter of interest and importance. Reducing vulnerability, persistence and impermeability in electronic management and control of network activity (military and civilian), avoiding the traffic and establishing safety in cyberspace, are of high interest in Passive Defense in the area of information technology. Information and Data packets routing in large networks, if not optimal, can lead to traffic, congestion and disability of all or part of the network services. Traffic and network congestion can be based on actual needs of users or by an attacker or malicious person, to disable all or part of the network. In this paper, we firstly consider the service quality and its criteria, and we try to introduce important routing algorithms in large networks and the Internet, special attention is also given in terms of routing parameters. Then by simulating them in network software (i. e. OPNET), we compare metric routing algorithms and introduce an optimal mix of work for traffic engineering and network service quality.