# Evaluating the Functioning Quality of Data Transmission Networks in the Context of Cyberattacks
## 7 Conclusions  
Based on the general principles of the construction and operation of modern telecommunication networks and ensuring the quality of services provided to users when heterogeneous traffic is transmitted, the paper proposes a method for the investigation of  
Figure 12: The graph of the distribution functions of successful data delivery in the context of cyberattacks when average time values \(T_{di}\) of rehabilitation of functioning of network elements are different.  
information transmission routes in a data transmission network for arbitrary distributions of the arrival and service of packets.  
The method is based on the data delivery process view in the form of a stochastic network, definition of its equivalent function, calculation of the initial and central moments of waiting and service time, calculation of the parameters of the scale and shape of the incomplete gamma function and further definition of the distribution function of the time of the successful delivery of data packets.  
The novelty of the proposed method consists in taking into account the parameters of the model of the realization of cyberattacks by a malefactor, which are set in the form of the distribution function of the attack realization time and the probability of network elements being available to the cybercriminal intelligence. For the initial distributions, it is proposed to use the gamma distribution as the most general, between distributions of the random time of the realization of private processes, which are implemented when communication is established and maintained in existing and prospective data exchange systems. The proposed method allows one to obtain estimates of the quality of the network functioning in the context of cyberattacks both during the transmission of stationary Poisson and self-similar traffic, which is represented in the method by the Pareto and Weibull flows models.  
The presented method showed a good agreement of the obtained estimate results with the data given in previously published works, which allows one to analyze and develop directions for a quality increase in data transmission network functioning in the context of the destructive information impact of a malefactor.  
It should be noted that in addition to the obvious advantages, the method proposed in the paper also has disadvantages that limit its use in practice. Therefore, for example, the method does not provide an analysis of the quality of DTN functioning when servicing a categorical data stream, which is typical for public telecommunication networks. In addition, the method requires a preliminary inspection of the DTN in relation to identifying cyber threats and modeling the cyber impact of an intruder on vulnerable network elements, as well as determining data transmission routes in the analyzed network in order to determine the initial data required for calculations. Therefore, future research and developments will be devoted to experimental implementation of the suggested method.  
[PERSON] and [PERSON] were responsible for conceptualization and methodology; [PERSON] analyzed the data; [PERSON] and [PERSON] conceived and designed the experiment; all authors wrote the paper. All authors have read and agreed to the published version of the manuscript.  
This research is supported by the grant of RSF #21-71-20078 in SPC RAS.  
The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.