## 1 Introduction  
Cyberwar, even in the recent case of the Russia-Ukraine conflict, is represented in the form of a hybrid warfare scenario accompanied by regular warfare, and it is constantly carried out in peacetime. Accordingly, countries around the world are advancing cyber security technology to enhance their ability to carry out cyberwarfare and following development procedures that emphasize security in the development of weapons systems. The basis of cyber warfare performance will be the strengthening of the cyberspace. Therefore, the training of personnel capable of carrying out defense and attacks will be the basis of cyber power. Realistic defense training is more efficient when conducted in a real-world environment. It is common to conduct such training in a virtual simulation environment because the nature of cyberwarfare can cause irreversible damage to the actual system in the training process. However, a training environment that lacks realism makes it difficult to expect practical results.  
In order to attain a robust cyber defense capability, cybersecurity capabilities should be equipped from the time the weapon system is built, and while it is tested and evaluated.  
[PERSON] emphasized that technical debt incurred when things are not properly fixed exponentially increases over years [1].  
A cyber range is a practice field that provides the ability to research, develop, test, or conduct cyber training on military capabilities in cyberspace [2]. In order to properly evaluate tests, it should be conducted in a realistic cyber range environment. In addition, cybersecurity capabilities and interoperability functions should be implemented prior to operational test and evaluation to ensure the success of system development [3]. In other words, in order to increase the effectiveness of cyber training, it is necessary to build a cyber range that resembles a realistic environment. Moreover, a cyber range that resembles a real system can also be used as a test evaluation site for weapon systems.  
In a military system where accuracy and security are emphasized above all else, it is necessary to build a realistic cyber range and conduct a variety of training and test evaluations. Recently, each military has been building its own cyber range that simulates the battlefield environment of each military. However, since the actual battlefield is an integrated operation environment, the cyber range built does not reflect the integrated battlefield environment that is interconnected. In order to overcome this, the concept of a multi-cyber range proposed in this paper will be developed into a highly useful concept. This paper presents a tool to allow a single cyber range to realistically link multiple cyber training ranges and authoring scenarios that are connected between ranges based on integrated management measures between training ranges.  
In this way, the construction of practical testbeds in various kinds of education and research is required, and it is a reality that is actively being researched and developed in schools and government institutions. Therefore, the main agenda of this paper, the design structure of connecting and expanding various ranges, will be indispensable for the development of cyber ranges.  
The remainder of this paper is structured as follows. Section 2 describes related works. Section 3 proposes a practical cyber range structure that can also be used for cyber training and interoperability assessment, explains the scenario-building measures and related functional elements, and presents the results of the implementation. Section 4 conducts cyber warfare experiments in range-connected situations to verify that the built range can best represent a cyber threat/combat situation. Section 5 describes the contributions of this paper and the direction of future research.