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Nowadays implementation of TCP and UDP protocols offer high speed and reliability on data links. Especially TCP implementations offer high speed rates, employing sliding window and data acknowledgement in TCP protocol. On the contrary, UDP offers different options and has other advantages and disadvantages. But in certain environment, especially with high delay and high bit error rate, these protocols have different qualities and behave in different way. Our goal was to investigate them and propose possible solutions to optimize overall performance. INTRODUCTIONThere are many studies, which have been accomplished to test overall performance of TCP and UDP protocols in different implementations and their behavior in different situations [1,2,3]. But not only cable connections are usually available -there is steady growth of wireless networks, employing different frequency spectrum, which has different qualities. There have been conducted many studies, trying to find optimal solution for Ad-Hoc [4,5] and satellite networks [6, 7]. As mentioned above, different technologies can implement different TCP and UDP stacks, optimized for defined conditions.

This paper explains the evolution of technology from obsolete military battlefield networks towards the global military battlefield information network from information and cyber security point of view. The authors focus on the threat of the communication medium which is mainly used in military battlefield information networks -the wireless channel, which is the basis of different mobile wireless systems. This paper deals with complex threats to military cyberspace, in which primarily wireless channels may be easily available by the enemy. Employed subnetworks may have different properties.A unifying extended layered model is presented in the article, which in addition to ISO/OSI model spreads cyber threat to geographic and social spheres. The article also shortly illustrates the development of electronic military warfare towards cyber military warfare.

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